My old 307 ran awesome with a Edelbrock 600 on it. Would the rich lean adjustment on a brand new Edelbrock carb be the next way to go, or could it be a fuel pump/plug wire/plug issue? Auto Mechanic: My 1995 mazda mx-6 v6 is hesitating, bogging during acceleration. If I'm at a low or higher cru8ising speed. The world's most exotic and powerful engines have traditionally been fed through Weber carburetors, and there is a reason for it. When taking off from a stop, when I slowly push down on the gas pedal just off of idle the engine will suddenly accelerate and the truck will lunge forward. com and find out wtf is happening. Connect the diaphram and see if the bog goes away. I'm not running an Edelbrock right now. I'm after some help identifying which version Cleveland i have. The problem is a stumble while the throttle is cracked open and held there so the accelerator pump isn't in use. Unhooked the throttle arm and return spring, then it was a matter of removing the 4 nuts from the carb studs. Pinging gone, timing is now set to factory spec of 10 BTC. It can cure the bog caused by the AVS opening too fast during hard acceleration. _____ You'll need a vacuum gauge, not a good one, I got mine at Baxter's here in town for $9. Re: Edelbrock carb stumble,hesitation,bog « Reply #6 on: May 26, 2011, 05:13:50 PM » Off Idle Stumble or Surging often occurs when the mixture screws have not been set up correctly. The performance of my car improved once again and the bog largely disappeared. The intake is a Performer 2-O. Royce, can you explain how that adjustable vacuum advance unit works, do you think it will help?. i sprayed that intake and carb all around with starting fluid it would only bog down when sprayed directly into the carb. I have a small homebuilt vehicle with a new, stock 350 GM engine that I put an Edelbrock manifold and 600 cfm carburetor on. Discussion Starter • #1 • Apr 14. Have a 1970's vintage crate motor (350/290HP) with headers & an Edelbrock 600 CFM carb (1406). As for the front jets I'd start with 65-67 jets. Three main components to the accel pump:. RE: Hestitation on Hard Acceleration from a standing Po Did this carb come on the 390 or did you put it on later. By understanding the operation of each you will be better prepared to calibrate your carburetor. got the primaries tuned and did a first gear pull opened up the secondares and it started stubmling bad wideband went lean then came back to a around 13 af so i let out. Fuel pressure good, timings right. The carb is a basic Edelbrock 1406, so a 600 with an electric choke. -Rob Anyone else have suggestions? Dakota Bob GenII 3/17. I've found the blue doesn't fit close enough in some of the pump wells. The carb for this project will be an Edelbrock Performer 600 CFM Carburetor with a manual choke, part #1405, as installed on a Mopar 318 cid (5. Your spitting and sputtering means you have a fuel delivery problem. The carburetors that's used on various models of Kohler engines are as follows:. It seems to be getting fuel could the timing need to be advance a little or ditch the edelbrock 750 and get a Holley marine carb. Holley type carbs come with a standard shooter size which differs by carb list #. I have the same problem as Jerry. Electronic Ignition. Open the throttle and it bogs/dies. TD trans dapt 2064 from Jegs (kit comes with studs) Stock fuel line and vacuum lines were removed. 06/30/2013 by monte. Edelbrock Tuning _____ Originally Composed by Don At FBO Systems Edited for clarity by some anonymous poser. Our performance air intakes are superior to OE in 3 ways – material, surface area, and on cold air intakes, temperature reduction. Car ran good with the Avenger 570, just not to its true potential. My favorite pre-school toys were a Packard carburetor and a set of tools. Put in new blazer cam (mild) and new flattop pistons. The difference is that in the Q-jet (and the AFB/Edelbrock too, for that matter), that change is produced by stretching the spring that lifts the metering rods (single spring in the q-jet. I would get 18 MPG with 2 600's just as good at the MPG game as a single carb. It starts fine. 047 - orange spring #1406 , electric choke , economy set metering /primary jets. Somewhere in between is what we are looking for. Or you can route fuel to both sides of the carb using Edelbrock's dual feed fuel line kit that's available in either the traditional blue/red anodized aluminum finish (PN 8133) or in fully. To accommodate cold starting requirements where additional fuel. New Y-5M needle jet (If the brass OEM one wears you get a big off idle bog and it will seem to run rich). A bog or hesitation problem could be the result of an under sized accelerator pump. Setting the initial timing to 12 degrees helped. Three main components to the accel pump:. Once that is as good as possible, go one step richer with yor secondary rods and see what happens. One pump and it fires cold. Bogging and not enough power can be caused by too little fuel, and overflowing can be caused by too much fuel pressure. Do as suggested above, remove the air cleaner (with the car not running so you do not get a backfire in your face) quickly move the trottle from idle to full acceration. Holley type carbs come with a standard shooter size which differs by carb list #. Pulled carb and cleaned. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise Posted by Chris Myer 08/11/17 22 Comment(s) Holley Sniper EFI Instruction , Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. i have alot of exsperience with holley and edelbrock set ups. Holley 600 on a 302 with performer intake and rv cam. com / Technical / Cars. Carb runs perfect at idle and wide open but bogs at beginning of acceleration. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. 5 v8 weber/edelbrock 500 carb with the map disconnected and vacuum end plugged, the KPA reads 102. Assuming ya got a 2100, 2150, or 4100 carb, move the accelerator pump arm to the outboard hole 70 F100 LB 2WD, 360FE, E-Street EFI, TKO-500, 76K original miles. The carb for this project will be an Edelbrock Performer 600 CFM Carburetor with a manual choke, part #1405, as installed on a Mopar 318 cid (5. DON'T use a re-ground cam ! you'll be sorry. edelbrock guesstimate info : #1405 carb , man choke , performance set metering/primary jets. The car has a very mild 351C 2V with and Edlebrock Performer, and a 700 Holley double pumper carb. Soft acceleration (10%)is livable, but any more (20-50%) throttle and she stumbles / hesitates. I heve the timing correct and all parts are new but the vehicle "stumbles" or bogs down on acceleration. Please post if you fined the fix as I will if I do. Lots of folks lately with Holley issues. Backfiring caused by internal carburetor problems is a result of a defective accelerator pump. Edelbrock is an especially good company for. I've tuned a hundred Carter AFB / Edelbrock 1405 manual choke carbs and they are a breeze. If you have a 4 barrel you will need a plate to block the heat passages in the manifold. Edelbrock carb stumble,hesitation,bog « on: May 25, 2011, 04:58:36 PM » I'm having off-idle stumble and there's a stumble when the secondaries come in. The bog or hesitation may be caused by a momentary lean condition when the carb goes from the idle throttle position to the main metering system. I can get 20" hg at idle, steady gauge with no fluctuation. I would use the Edelbrock, however when the Holley runs good, I feel IMHO that it outperforms the Edelbrock. 250" throttle bore and venturi that measures 1. This is how you access the Adjustable Part-Throttle setting after the carburetor is assembled. Attacked the rich idle issue by pulling the carb off and checking the idle slots. Hand feed gas to carb when. I've found the blue doesn't fit close enough in some of the pump wells. I have … Continued. New to the site. 1; 2 Can't seem to find that happy medium of smooth acceleration without the knocking. All these Issues and more have been Fixed!!! Part #: ND4345-NEW Fits 1971 Chevy Trucks 350 Engines Manifold Choke About Us & Our Carburetors We can Rebuild Any Carburetor for Any Engine on any Year!!. A longer squirt of gas is needed. Plug the gauge on the lower port on the front of the carb, this should NOT have your vacuum advance unit hooked to it. >mixture on a Edelbrock QwikSilver carb because I've just bought a > Snip. If your carburetor isn't listed yet, please contact us by email as chances are that we can help you anyway. The AVS2 features annular flow primary boosters with a new calibration for improved off idle and cruising performance. I have a Holley 770 Street Avenger that is in questionable shape that came with it. See the picture below. Bogging and not enough power can be caused by too little fuel, and overflowing can be caused by too much fuel pressure. B&S engine idles, but bogs and dies on acceleration [ 1 Answers ] This is an 8 hp B&S horizontal shaft motor. Observe the pump jet in the carburetor, and with your hand, work the carburetor throttle to the wide-open position. Designed and calibrated for optimum street performance in small-block and some big-block engines. I'm assuming the rear (primary carb) secondaries will begin to open from vacuum at that point. It felt like a 40 horsepower drop! Like was said earlier, keep the original carb in a box and run a 600 or better holley or edelbrock. Hopefully someone looking for a good all around street oriented performance carburetor can benefit from some first hand info on this carb, as well as an honest comparison to another supremely popular street oriented. 5 to 14:1 range and WOT in the 12. Carb Class: Giving The Bog The Boot By: Quick Fuel Technology 05/18/2010 < Back to Blog Home The sole purpose of the accelerator pump system is to provide a combustible air/fuel ratio during hard acceleration, especially from idle, for the time it takes the main metering system, via the booster venturi, to respond to the increase in air velocity. I estimate the motor will make around 300-320 hp and pull decent vacuum (12-13 in). If you should change out the carb to a non CC HEI. 7 : 1 is the ideal for complete burning and lowest emissions. Edelbrock carb stumble,hesitation,bog « on: May 25, 2011, 04:58:36 PM » I'm having off-idle stumble and there's a stumble when the secondaries come in. (I had others but I will save that for later. Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400. About ten years ago I gave up on my Holley 4-barrel carburetor and purchased an Edelbrock four-barrel. All the other EBay sellers claim to have new units, but they are just rebuilt units and claiming there new. IMO it's not a good carb for any kind of real hillclimbing. Im having a hard time selecting a good carb for my 79 Firebird Formula, the motor is a 72 Olds 455 bored 40 over, edelbrock aluminum heads, edelbrock Carburetor selection - TrueStreetCars. couldnt get the secondaries to come in for shit and was laggy tried a bunch of things and gave up and orderd the 500 cfm. I've tuned a hundred Carter AFB / Edelbrock 1405 manual choke carbs and they are a breeze. The car won't break the tires loose from a stop, something it can normally do with ease. I was thinking that may be a little too much carb and was debating getting an Edelbrock 600 Performer. A stock 440 or even a mild 383 won't need that must carburetor. 01-02-11 12:41 PM - Post# 2025792 In response to strictlygm To run well without EGR you need a custom chip/tune. Runs very hard and has no bog at all. 1) Vacuum leak. The tq is very tunable and adjustable in my experience. Runs good. 100" longer from diaphram base to the hole where the linkage hooks up. i sprayed that intake and carb all around with starting fluid it would only bog down when sprayed directly into the carb. Slowly adjust the first idle-mixture screw. The trouble carb is a Barry Grant Road Demon carb. The difference is that in the Q-jet (and the AFB/Edelbrock too, for that matter), that change is produced by stretching the spring that lifts the metering rods (single spring in the q-jet. Idles fine. The transition from idle to part-throttle is essentially the hand-off of the Idle System to the Primary Main System. Inlet manifold is marked 1TE8 76OA9925EA Carb is a 4 barrel Holley. The reality of it is that with any of the Edelbrock Carbs your engine will only get what it can use. Engine in a vehicle currently. Carb runs perfect at idle and wide open but bogs at beginning of acceleration. Secondary venturis opened up to 1. Table of Contents. I was able to get my 307 to run really good with just a nice 600 carb, curve kit in the distributor (timing all in at 2500 RPM), and a good tune up (new plugs, wires, cap, rotor, etc). i had the simular carb on a FE block 390 ford F-100. While Chevrolet Performance makes a popular 4 barrel intake (part #25534394), it is our friends at Edelbrock who offer the widest and most popular selections of carb-ready LS intake manifolds on the market today for LSX engines. It drives fine under. If the wrong carburetor is used on any particular engine, the engine may not run right and not produce full power. The Edelbrock #1806 650cfm works well or the new DEMON CARBURETORS just recently released a new carb with 500cfm primaries and 850 cfm secondaries with your choice of either a composite or aluminum main body. Do a search on almost any auto forum about edelbrock carbs and the infamous WOT bog and you will get plenty of info. I first had backfiring at 1/3 throttle, replaced the points with electronic module , changed coil, changed gas lines, added a fuel/water separator, put new fuel filters in carb and fuel pump. (located near the top of the carburetor and below the throttle lever with the link attached) inward to increase, or outward to decrease. Edelbrock 1404 500 CFM four barrel carb (Carter AFB clone) It drove well with no bogs or flat spots but the old throttle acceleration) in the 13. Just as the upgrade to a factory-style ('72 & up model year) electronic ignition is (as the prior Mopar Perf electronic ignition kit. The car would stumble as soon as the throttle was cracked open from idle. 7, steady state cruise a little rich out of the box. The trouble carb is a Barry Grant Road Demon carb. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. The Edelbrock AVS2 is available in both 500 and 650 cfm, with manual and electric chokes, and timed and full-vacuum ports. I know a little about the smaller Weber-Edelbrock 500. Under acceleration it pulls like a freight train. Anyone here have experience using an Edelbrock 1405 carb on a Performer RPM Aluminum high rise intake? (model #1701 for sbc). Holley double pumpers in sizes from 600 to 850. I have a Edelbrock 1409 marine carb that I just can't seen to get the rear air valve to open correctly so the engine can rev properly. Timing advanced to far, carb was set up to run right. The top (air cleaner bridge AREA) is modeled after a 4150 so it is 5. Climb a hill, bike bogs. First, the 1406 is lean, on purpose, on the primary side. It has a 460 with the Edelbrock carb and Duraspark II ignition. This is an option if you have a carb that is below 750 CFMs. The stock accelerator pump for carburetors less than 750 CFMS is Edelbrock part number 1470. The carburetor is the main component responsible for metering and delivering the air fuel mixture required for the engine to run. I waited for this carb for 6 months while it's availability was delayed. 7, steady state cruise a little rich out of the box. The problem is a stumble while the throttle is cracked open and held there so the accelerator pump isn't in use. It doesn't seem like it is affecting anything cause it drives fine and revs really fast. 1) Vacuum leak. Holley carburetor bog and hestitation fixed. Jan 18, 2017 | Dodge Cars & Trucks. Im going to pull a plug or two, check for lean vs rich, order a rebuild kit (in case I need parts), remove, dissasemble (as above) and clean the carb, and post pics as I go. Holley 600 on a 302 with performer intake and rv cam. FYIW- I have a B&S Illustrated Parts List for the 28B700 engine. Pulled carb and cleaned. The cure for off-idle bogs in a Q-jet is often effected by making the exact same change you did to your Holley. I think the 35 leak jet and getting the acc pump timed right is the key to no bog. It falls on it's face, and sometimes just stalls. I tried changing jets, spring, rods, timing, moving the accelerator pump arm, etc. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. 500-550cfm carb recommended for a *healthy* engine of this size. Whipple supplies you with a CARB sticker. It used to behave exactly the same way. Edelbrock has some metering rods with even larger differences between their economy and power steps so I tried the next size-difference larger. the idle is still high at 800/900 rpm, dropping idle speed screw has no more effect. The carb has to be plugged to the sensor in the thermostat housing in order to work right. Motor had no issues until I started it after sitting in the garage for 1-year, runs rough & "backfires" through 1 side of the header exhaust (passenger). Buy a primary metering spring kit. i have alot of exsperience with holley and edelbrock set ups. Edelbrock 1406 Performer 600 CFM Square Bore 4-Barrel Air Valve Secondary Electric Choke Carburetor The Edelbrock 1406 Performer Series 600 CFM electric choke carburetor is a precisely tuned, quality-built carburetor that can handle the rigors of daily driving while delivering consistent, reliable street performance from day to day. A place like Summit or Jegs has the best price on that sort of thing. Pulled carb and cleaned. Carburettors with mechanical secondaries must be chosen very carefully, as a carburettor that is too big will result in "bog" or "sag". New edelbrock carb bogs & surges at wot. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. i have a question about a 1813 thunder series avs carb i purchased in 2007. I had the problem every time I rode in slop. Note the three numbers. yes, it is in the top hole as suggested by Edelbrock tech, I have tried all 3 holes and none of them had any effect on the hesitation. 033 as suggested in the many forums I have read for this upgrade, new stator, new wire harness front and rear, new coil, new cdi, new regulator rectifier, new fan, new gaskets, no vaccum. A carburetor meters best over a specific air flow range and has extra circuits added to cover idle, power (acceleration), and cold starting. Check for fuel lines too close to a heat source causing vapor lock. Find out what cam specs will work with you carb set up or get a low rise three carb manifold and send the tunnel ram back. 650cfm carb is too big. Instead, you can use Edelbrock part number 1468 which has a stronger spring. It has a reputation for being a "bad" carb: bogging, hesitation, leaky, difficult to adjust (tune) to an engine, etc. 88 Gulf Stream 34' Sun Vista, Ford 460, Edelbrock Perfomer carb, Thorley headers Ford F-250 crew cab 4X4, 6. You can try blocking the channel between the float bowls w/vac line cut in half, but it only helps a little. between metering blocks and jets just might be able to pull it off. It bogs if you snap the throttle. Mine was pretty bad at start up. And if you didn t say, Wow!. 1) Check for vacuum leak & fix it. I wanted to make sure. In this case, a bigger carburettor is not necessarily better. PUMP SHOT (%) Adjustment range: -100 to 100% Controls the amount of additional fuel that is injected for acceleration enrichment. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400. Here are some facts that may turn me to efi: carb+boost+e85=safe, awesome power carb+boost+e85+air temp changes=suck (wot afr's 11. It has a set of edelbrock performer series heads on it and A 750cfm edelbrock carb. The good news is that these can easily be replaced without carb removal. If your engine is running too rough, it's important to adjust the mixture and find the correct idling speed to decrease engine. Lots of ancilliaries bolted to it. This is how you access the Adjustable Part-Throttle setting after the carburetor is assembled. Its a Edelbrock 1406 model. Re: Debate on carb size on my 351 cleveland Edelbrock 750's are overkill for 350/351's if they are mild builds. Hit the throttle at speed, bike bogs. The bog or hesitation may be caused by a momentary lean condition when the carb goes from the idle throttle position to the main metering system. Dude, I had this. But while our first test proved that the Powerblast Plate is all it’s cracked up to be on the double-pumper Holley, we decided to put it on another car to see the results on a different carburetor. Then came the Weber Edelbrock carb system, and a 200-500 cfm variable has turned out to be a real winner for part throttle economy with Throttle response, Torque and BHP gains throughout the entire rev range, and with very smooth and enormous top-end potential on any engine up to 5. Buy a primary metering spring kit. The trouble carb is a Barry Grant Road Demon carb. Now, while my friend that is helping me install the carb and get the engine running: like I stated before he is a Holley fan and does not really like Edelbrock carbs. The two metering rods in an Edelbrock carb have stepped ends that protrude into the main jets and restrict or increase the flow of fuel through the orifice proportional to engine load. As more vehicles today are computer-controlled and fuel-injected, the word "carburetor" is going by the wayside in the same direction of the Beta Max, dial telephone, typewriter and 8-track stereo. 2 pilot air jet (Up 2 sizes - reduce off-idle rich bog). The extra distance between the throttle plates and the intake manifold allows fuel to better mix with the air before it reaches the intake plenum. Under acceleration it pulls like a freight train. Fuel pressure good, timings right. Connect the diaphram and see if the bog goes away. Most the time comes from running out of gas from the accelerator pump. The car became a dog! It was not that the carb was not working properly it is that the carb is way undersized for the 390. I have a Edelbrock 1409 marine carb that I just can't seen to get the rear air valve to open correctly so the engine can rev properly. Ive had the left one in use for years, but my 1978 engine with pcv and breather only- no emissions items installed, makes me believe I should switch the port and plug the opposite side. Some people have found that they could eliminate their acceleration bog by raising their carb with the spacers that have separate holes for each barrel. Not real bad but it bothers me. Setting the initial timing to 12 degrees helped. I have a matching edelbrock intake and cam and heads to go along with my carb and some edelbrock headers too. Story and photos by John Bellah. Been trying to fix the bog at wide-open-throttle “stomp”, and I’ve got a combination that seems to be pretty darned good. You will find that if you put your foot in it, it will bog. 32/34 max these days is best. Twilight Garage Rochester 2GC 2 Barrel Carburetor. 0:1 that went lean at about 13. bogs from the sideways because one float drops to bottom- causing flooding. This question was recently asked by one of our customers. If you replace it I would reccomend an AVS Edelbrock carb- they are very good carbs and easy to live with. When I first got it I tuned the idle and it ran, but smelled like a refinery at idle and had a bog at low RPMs while driving (a second or 2 after you start to accelerate or change gear). Re: sputter and backfire during acceleration. the issue i am having is i have a 1968 charger with a 383 engine stroked to 500 cu in. necessitate departures from theoretically ideal. 3) Clean out the nozzle. The bog or hesitation may be caused by a momentary lean condition when the carb goes from the idle throttle position to the main metering system. The tq is very tunable and adjustable in my experience. Find Edelbrock Accelerator Pump Nozzle Kits 1475 and get Free Shipping on Orders Over $99 at Summit Racing! These Edelbrock accelerator pump nozzle kits will allow you to fine tune your carburetor. Edelbrock had me change the nozzles but as far as I can tell, fuel only comes out of those when the accelerator pump is being used so that was a waste of $30. And sometimes, it just bogs. it's why I ditched the edelbrock. In addition, if the fuel level is set too high in the float chamber, a rich mixture will result. I can get the series # off of engine or more information on carburetor itself. Car starts on a dime and drives great for about 10 mins just all of a sudden just bogs down and idles really low then finally stalls. Re: Engine backfiring through carb with stumbling on acceleration I to think it sounds like an accerlator pump. Please post how you resolve this. Im going to pull a plug or two, check for lean vs rich, order a rebuild kit (in case I need parts), remove, dissasemble (as above) and clean the carb, and post pics as I go. Sometimes an engine will experience a stalling problem when the A/C compressor is engaged. I'd change the secondary spring to one thats more heavy. This is a popular carb for the small block Ford and is the trickiest Performer carb to tune. and FAST takes care of the rest. Pulled carb and cleaned. -Rob Anyone else have suggestions? Dakota Bob GenII 3/17. Backfiring during acceleration can also be caused by internal carburetor problems, low compression, leaks in the fuel tank, lean engine conditions, and weak or broken valve springs. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. little up date on my setup- got the 4. A simple carburetor swap to the slightly larger 650 got us to well over 300 horsepower with a solid 304. I've tuned a hundred Carter AFB / Edelbrock 1405 manual choke carbs and they are a breeze. The later “Thunder” version of these carburetors, made by Edelbrock (and not pictured here), uses a Torx and flat head screw on top on the driver’s side of the carburetor to adjust the secondaries’ opening rate. The original Edelbrock carburetor design is still available and offers affordable performance for hundreds of applications. When your engine hesitates during acceleration, it may seem to have lost its power for a few seconds. Factory exhaust manifolds, dual exhaust, Unilite distributor. When the throttle is pushed full open the engine revs to around 2000rpm, hesitates/bogs, and once it hits 3000rpm begins to accelerate normally but slowly. 6 litre motors. Observe the pump jet in the carburetor, and with your hand, work the carburetor throttle to the wide-open position. I would think the engine is out of time or the spark plug wires are not installed correctly. As for the progressive I have to use that or I get way to much air into the motor on acceleration and it bogs like crazy. First, the 1406 is lean, on purpose, on the primary side. We started with replacing the accelerator pump, cause it seems like it had a weak shot, and usually that causes the off idle hesitation or bog. If the wrong carburetor is used on any particular engine, the engine may not run right and not produce full power. I have a 77 350(not original) that I have spent the last year restoring. A fuel air ratio of 12. The carb is an edelbrock 1411 750cfm electric choke on a 1974 360 engine. -Rob Anyone else have suggestions? Dakota Bob GenII 3/17. The engine idles beautifully and revs up fine, but it will sometimes die when put in gear and bogs down heavily when accelerating Raise the idle speed or install an idle stop solenoid kit if it doesn't have one. My old 307 ran awesome with a Edelbrock 600 on it. 8 v6 5 speed, and when i put it in gear and hit the gas to take off i hear a loud clanging/banging type sound and as i press the gas more the sound gets louder and louder and the car starts missing the more harder i press the gas. A fuel air ratio of 12. Bogs Hard starting allowing excessive heat under the carburetor. A bogging holley does not necessarily need bigger jets it probably needs a larger discharge nozzle (squirter) for the accelerator pump or it needs a pump cam or cam adjustment there are two positions for these and many different cams as well as if the carb is a double pumper or vacuum secondary there are many other things but jets will not. Assuming ya got a 2100, 2150, or 4100 carb, move the accelerator pump arm to the outboard hole 70 F100 LB 2WD, 360FE, E-Street EFI, TKO-500, 76K original miles. Ok, my friend and I have been trying for several days to get the stumble out of the carb in his Roadster. Joined Dec 7, 2005 · 1,341 Posts. Holley type carbs come with a standard shooter size which differs by carb list #. One carb vent goes to the forward end of the float bowl and the other dead-ends at the bottom of the stock vent. The problem is a stumble while the throttle is cracked open and held there so the accelerator pump isn't in use. Story and photos by John Bellah. Runs exactly the same on either carb. to large of a squirter isn't good for a driver either. If bog exists only from an idle, not when accelerating from a constant speed, the idle adjustment is probably the culprit. acceleration stalling, poor idle, bogging down. i as well am instrested to see if this works. A simple trick to see if you have lean fuel condition at idle is to lay a shop towel across the carburetor air-horn. It turns out it was a M hanger, along with the DR rods. The holley carb has many diffrent upgrades you said you changed th nozzle from 25 to 31 that is a huge jump. B&S engine idles, but bogs and dies on acceleration [ 1 Answers ] This is an 8 hp B&S horizontal shaft motor. 99% of all hesitation/surge problems with these carbs can be resolved by checking float levels, and then changing step-up springs to better match your car's engine conditions (mainly vacuum measurements). Unhooked the throttle arm and return spring, then it was a matter of removing the 4 nuts from the carb studs. It's a 454 with Edelbrock oval-port heads, a Comp 268 cam, a 750 Holley, a TH350 trans, and 3. If I hammer it down it falls on its face first and then takes of hard. Am using the stock 1978 ignition system. I had the problem every time I rode in slop. Weber-carbureted engines deliver explosive acceleration and torque unmatched by conventionally-carbureted engines, and they have a sound all their own. 31 in it not sure if I need to go smaller or bigger. Its sputtering, backfiring, misfiring, in the low RPM band (below 2k) hit the gas and it upshifts and clears up. Edelbrock carb adjustment Does anyone now how to work out what jets/needle combo to use for a edelbrock performer 1405 on a 305 Chevy It feels like it bogs when the secondaries open, i know i have asked this before on a different forum and i was grateful for the advice but was too embarrassed to state that it went over my head. When I first start the engine it runs great, and idels in great. The bog or hesitation may be caused by a momentary lean condition when the carb goes from the idle throttle position to the main metering system. Backfire is caused by combustion in the intake manifold. According to JET, this carburetor is intended for racing purposes only. Robert recommends a replacement jet - size #98. I did end up installing a pre-1972 timing set in it to zero the cam, but after that, I could not seem to get rid of the bog/backfire that you describe. roscoehd New I have an off idle stumble with my Edelbrock carb and cant seem to cure it. I have a newly rebuilt q-jet 4bbl that is installed on a 350 in a 1980 C-10. The carb is an edelbrock 1411 750cfm electric choke on a 1974 360 engine. If you are using an Edelbrock or Carter AFB and are experiencing a bog at low RPMs, try experimenting with the following metering rods:. Hit the throttle at speed, bike bogs. It has a reputation for being a "bad" carb: bogging, hesitation, leaky, difficult to adjust (tune) to an engine, etc. Ford 351 Cleveland Engine Carburetion Guide Induction begins with a carburetor and there are a lot of them to consider these days because the market is competitive and plentiful. Always filter, such as Edelbrock #8873 bœw:cn the pump and carburetor. Edelbrock has some metering rods with even larger differences between their economy and power steps so I tried the next size-difference larger. This is a popular carb for the small block Ford and is the trickiest Performer carb to tune. Holley type carbs come with a standard shooter size which differs by carb list #. Rough idle, backfiring. If you are experiencing a bog or hesitation off idle, you can try a larger, higher # shooter size. Twilight garage rochester 2gc 2 barrel carburetor. Hp Tuners Lean Idle. The new carb fired right up and with some minor adjustments to the mixture and fast idle / idle screws it works very well. 5 psi for proper operation. It was produced in many forms, including electronic-control from 1980. The engine is a newly rebuilt 400, auto trans. by Fred Baum in the May and June 2006 RootesReview:. due to valve clearance, or so I'm told) Thanks again everyone! HEI and Edelbrock carb are a relatively inexpensive upgrade to the 304. Re: Edelbrock 1406 Problem - Hesitation Accelerating from Stop I have 2 1405's on my setup. NOTHING worked. Had a bogging problem shifting from 1st into second and it turned out my carb was running way too lean. Category:Home Release time:2014-09-16 Views:130. Keep hood clearance in mind as you experiment with carb spacers. Topic: Engine Bogs and Misses Under Hard or Mild Acceleration (Read 4535 times) CRW-FK5. I dug into the issues a bit and have came up with the following: 1. It recommends moving the linkage to a hole further away from the pivot to help eliminate bog. Ive bought this 79 bronco w/ a 351m all stock. Been sitting 2 years. Section two is a parts diagram of Carter/Edelbrock 4 -barrel carbs. Not real bad but it bothers me. Holley 600 on a 302 with performer intake and rv cam. 2-Steady state cruise. In one car with a 770 Holley I found that adding drag radials to it (so that it wouldn't just spin the tires) but then made it stick created a bog, too. Of course, you. In addition, if the fuel level is set too high in the float chamber, a rich mixture will result. The bog or hesitation may be caused by a momentary lean condition when the carb goes from the idle throttle position to the main metering system. A fuel air ratio of 12. Ive had the left one in use for years, but my 1978 engine with pcv and. Looked at diapham, etc. Disconnect the fuel feed hose at the rear carburetor, place it in a vessel, and switch on the ignition switch to check for fuel flow. Got an Edelbrock 1411 carb (750 cfm) and now I'm afraid to drive it. The Edelbrock Performer Series carburetors are a redesigned Carter unit that gives near electronic fuel injection economy while maintaining wide open throttle performance. Holley double pumpers in sizes from 600 to 850. I've had mechanics work on it and still not fixed. This feature operates on the same principle as a carburetor acceleration pump. Typical performance stuff. With the improved flow metering, which makes this carburetor ideal for most small and big-block engines with either dual- or single-plane intake manifolds. If you see black shilt in the float bowl you could have a saturated vapor cannister. Re: sputter and backfire during acceleration. You should observe a healthy squirt of fuel from the pump jet. checked solenoid on bottom of carburetor …. Put in new blazer cam (mild) and new flattop pistons. Last, do a simple but thorough vacuum leak check - all your vac hoses (check for breaks, hard ends that don't fit tight on the nipples, etc). The new Edelbrock Pumper Series carburetor is designed for today's high-performance four-stroke engines. Everything's new. Backfiring caused by internal carburetor problems is a result of a defective accelerator pump. carter thermo-quad carburetor: I like the carter t-q and currently run one on my 392 engine in my truck. RE: acceleration hesitation!!! IP: Logged Message: yeah i dont think hesitation is a strong enough word for this awful engine: rob cooley Dodge Dakota JOIN HERE 3/17/2002 17:20:33: RE: acceleration hesitation!!! IP: Logged Message: Thanks Bob, I'll try your ideas. i have alot of exsperience with holley and edelbrock set ups. I have an Edelbrock Performer 600 cfm on one of my just slightly warmed over 360's, and it does a great job. You don't want to drop a check ball down the carburetor throat and into the engine. Observe the pump jet in the carburetor, and with your hand, work the carburetor throttle to the wide-open position. Open the throttle and it bogs/dies. 5 to 14:1 range and WOT in the 12. 3-Slow acceleration, as if to pass without down shifting. FUEL REQUIREMENTS: Edelbrock carburetors require a fuel pressure of 4 - 6. Next I pulled the sec. OK so i rebuilt a 1980's 305 from a car only two bolt main. The design allows the bowls to leak way too often. but i think i may have found my culprit. Just as the upgrade to a factory-style ('72 & up model year) electronic ignition is (as the prior Mopar Perf electronic ignition kit. Although the difference in peak-to-peak horsepower is only 5. 0:1 that went lean at about 13. 250" throttle bore and venturi that measures 1. 71 chevy with 350 engine, edelbrock intake and 600 cfm carb setup, new HEI distributor put installed, 8mm spark plug wires. The hesitation is caused by needing a bit more fuel because it is leaning out at sudden acceleration. i had the simular carb on a FE block 390 ford F-100. Has anyone ever tried drilling the counter weights to get more air flow into the rear with out a bog at WOT. Too much plenum volume. How To Fix Off-Idle Stumble - Idle Talk the problem is that the carburetor can't be used on an engine with a less radical cam because the holes will create excessive idle speed. Soft acceleration (10%)is livable, but any more (20-50%) throttle and she stumbles / hesitates. I'd use a 261 cam. Go out and try a Wide Open Throttle acceleration. Backfiring caused by internal carburetor problems is a result of a defective accelerator pump. Re: Boost referencing a Holley carb There is a real simple way to do this. If that’s what you are used to, then the Demon might look a bit scary. It bogs if you snap the throttle. A simple trick to see if you have lean fuel condition at idle is to lay a shop towel across the carburetor air-horn. Flow test carb to check jetting. 0 out of 5 by 3. 413's came with square bore manifolds and small holley carbs. I think the 35 leak jet and getting the acc pump timed right is the key to no bog. Delivering you a completely tested, calibrated. Edelbrock Performer in 600 and 750 sizes. Edelbrock is an especially good company for. The engine block and heads were machined to bring the compression up to 9. you jet it higher alot easier. If you replace it I would reccomend an AVS Edelbrock carb- they are very good carbs and easy to live with. Any help or thoughts wo. Edelbrock manufactures carburettors for classic cars and street performance machines. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. A single barrel carburetor will normally squirt a single stream; while a two or four barrel carburetor will normally squirt 2 streams. 1475 - Edelbrock Tuning Accessories For Performer and Thunder Series Carbs is rated 4. I did have to have Whipple supply an updated tune to get rid of weird acceleration bog in 5th/6th gears. carter thermo-quad carburetor: I like the carter t-q and currently run one on my 392 engine in my truck. Designed and calibrated for optimum street performance in small-block and some big-block engines. 5 v8 weber/edelbrock 500 carb with the map disconnected and vacuum end plugged, the KPA reads 102. 3) Accelerator pump nozzle has dirt in it. Occasionally, the carburetor's idle jet will become clogged with dirt, which will cause the hesitation or stall. Please advise me on what the real symptoms of lean vs rich system is. Edelbrock® 95mm Mass Air Flow Sensor Kit Ford Mustang 5. Jump to Latest Follow 1 - 4 of 4 Posts. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. I have a edelbrock 1406 600cfm carb on my mild 360 magnum. Category:Home Release time:2014-09-16 Views:130. Carburetor Fuel Mixture (Fixed & adjustable jet carburetors) 1. it's also possible that the check valve in the accelerator. The two metering rods in an Edelbrock carb have stepped ends that protrude into the main jets and restrict or increase the flow of fuel through the orifice proportional to engine load. I have a 1978 302 in a 1926 model T. So the part throttle response is drowned. i don't think its a vaccum leak checked all above intake, even plugged the pcv and held my hand over. Try a 600 cfm if available. Note the three numbers. The difference is that in the Q-jet (and the AFB/Edelbrock too, for that matter), that change is produced by stretching the spring that lifts the metering rods (single spring in the q-jet. Heads were stock nothing special either (no H. Would the rich lean adjustment on a brand new Edelbrock carb be the next way to go, or could it be a fuel pump/plug wire/plug issue?. Instead, you can use Edelbrock part number 1468 which has a stronger spring. yes, it is in the top hole as suggested by Edelbrock tech, I have tried all 3 holes and none of them had any effect on the hesitation. An oil or additive with a zinc enhanced formula must be used with flat tappet cams. Immediately the bog / stumble was back. It gets up and goes good when accelerator is engaged. - carb charts recommend 760 cfm. Its a Edelbrock 1406 model. Genuine gm (10067353) 350ci / 5. Engine will speed up with opening the idle screw. 095 metering rods. Try to hear car’s idling closely. new edelbrock rpm air gap intake #7501 SS fuel line from pump to AN fuel filter - fuel pressure guage - carb Also, everything in the distributor is new, from ign mod to radio cap / wiring, wires are under a year old, same with plugs. Normally, the PCM should increase the idle speed to compensate for the added load on the engine when the A/C is on. Mine was pretty bad at start up. I use #1467 pump. Talbot Samba Carburetor Service Kits. Holley 7448 Rebuild Instructions. Pontiac used the Quadrajet on engines ranging from 301 to 455 ci. And in very rare cases a malfunctioning carburetor can lead to an engine fire. Tim Stocker Photography / Getty Images. float level being low can cause a bog. The 1411 is a 750 cfm if I am correct. The Holley EFI system seems to be a great addition to. Anyway I just bought this boat last year (see pic below) and didn't have this problem. ) bog with giving it slight gas while driving stutters, shutters, wants to die out, occasionally gives a small pop out of carb, I'm guessing this has to do with size of accelerator pump nozzle? right now has. My definition of bogs: Engine feels as though it is running out of gas. Its sputtering, backfiring, misfiring, in the low RPM band (below 2k) hit the gas and it upshifts and clears up. If you are serious about tuning the idle and transition circuits for best results, especially maximum fuel efficiency usage, you start to appreciate a carb with replaceable air bleeds in the carb’s main. The hesitation is caused by needing a bit more fuel because it is leaning out at sudden acceleration. But still some hesitation and "cut out" at high RPM's. So, leaky-cracked manifold? Fouled plugs. I finally concluded that I could use the Edelbrock carb as boat anchor and replaced it with Holley Street Avenger five years ago. Keep hood clearance in mind as you experiment with carb spacers. 033 as suggested in the many forums I have read for this upgrade, new stator, new wire harness front and rear, new coil, new cdi, new regulator rectifier, new fan, new gaskets, no vaccum. Holley remains the carburetor of choice but there are nice alternatives from Demon, Edelbrock, Summit Racing, Quick Fuel, and Proform. Edelbrock has some metering rods with even larger differences between their economy and power steps so I tried the next size-difference larger. Edelbrock carb adjustment Does anyone now how to work out what jets/needle combo to use for a edelbrock performer 1405 on a 305 Chevy It feels like it bogs when the secondaries open, i know i have asked this before on a different forum and i was grateful for the advice but was too embarrassed to state that it went over my head. If you have had a backfire you might have bad "power valves"(inside the carb). The carb is an edelbrock 1411 750cfm electric choke on a 1974 360 engine. Factory exhaust manifolds, dual exhaust, Unilite distributor. It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. 500-550cfm carb recommended for a *healthy* engine of this size. i agree with GD. Its a Edelbrock 1406 model. I've tuned a hundred Carter AFB / Edelbrock 1405 manual choke carbs and they are a breeze. Edelbrock Tuning _____ Originally Composed by Don At FBO Systems Edited for clarity by some anonymous poser. I removed a 750 Holley that had major issues and bought what I thought was a 750 edelbrock used. Be sure there is oil in the dashpots on the carburetors for a smooth idle and to prevent hesitation on acceleration. 5" above the vent tubes on top of carb. First things first. Too far out and it starts running funky. I heve the timing correct and all parts are new but the vehicle "stumbles" or bogs down on acceleration. I tested on a 357" sbc a much modified 4779 on an edelbrock RPM intake vs the tunnel-ram and out of the box edelbrocks 1405 carbs and the edelbrocks made 53 minimum HP at the wheels everywhere. I have a 1976 Nova with a completely brand new rebuilt 406 Small block. The most common of these issues are rough idle, bogging during acceleration, noticeable hesitation, backfiring, and (the symptom most classic car owners love to hate) stalling. Usually the backfiring is more severe under hard acceleration when the carburetor is lean due to fuel supply. Bog from a cruise RPM may be caused by a defective advance mechanism, but on 4 barrel carburetors is often caused by the secondary side opening too soon. 7 : 1 is the ideal for complete burning and lowest emissions. The location of the idle mixture screws varies with each carburetor. A single barrel carburetor will normally squirt a single stream; while a two or four barrel carburetor will normally squirt 2 streams. it's why I ditched the edelbrock. I pulled the carb apart yesterday to find that it has stock jetting and metering rods. the bogging down is when I initially press the accelerator and then when it getts more fuel it takes off without the bog and good acceleration. If you are not using your ported vac connection on the side of the metering block you can use that passage to feed the power valve well by either milling a slot in the main body or you might be able to just trim the gasket to allow the pressure in. By understanding the operation of each you will be better prepared to calibrate your carburetor. They say it takes a good 500 miles for the system to self tune. NOTHING worked. Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400. And worse, many claims of lean conditions and rich conditions are contradictory. 1; 2 Can't seem to find that happy medium of smooth acceleration without the knocking. Will not start. The Edelbrock carburetor has three (3) basic systems that meter fuel to the engine: The Idle acceleration, it is able to overcome the force of the Step-Up Spring and hold the Step-Up driver as a "bog" or "flat spot" on secondary opening, it is necessary to add fuel by an Secondary Main System: The Secondary Main System. Due to this you can mount the throttle body in any direction on your engine. Bogging and not enough power can be caused by too little fuel, and overflowing can be caused by too much fuel pressure. 99% of all hesitation/surge problems with these carbs can be resolved by checking float levels, and then changing step-up springs to better match your car's engine conditions (mainly vacuum measurements). And, it’s easy to do it yourself! Remove the top of the carburetor to expose the AVS butterfly and weights. A fuel problem would be constant as well as dirty carb, clogged hoses, leaking intake, so the problem is related to the heat which is prolly the points/condensor. If I ease into the throttle there is no bog when the secondaries opens. Edelbrock 1406 WOT bog/stumble--how I fixed mine I tried changing jets, spring, rods, timing, moving the accelerator pump arm, etc. 4) Plastic Choke Pull off's that break. Edelbrock offers a dual feed fuel line, part #8091, that will simplify plumbing your pump to two Edelbrock carburetors. thats why i purchased this model carb and size. Talbot Samba Carburetor Service Kits. Edelbrock Sputtering and Bog at WOT Acceleration! Jump to Latest Follow Do a search on almost any auto forum about edelbrock carbs and the infamous WOT bog and you will get plenty of info. It falls on it's face, and sometimes just stalls. It is a float thing. Part throttle response is great and crisp. Holley double pumpers in sizes from 600 to 850. I was thinking of this post as I drove the '75 Country Squire earlier. So essentially my engine was leaning out so bad under heavy acceleration it would bog down. The bog or hesitation may be caused by a momentary lean condition when the carb goes from the idle throttle position to the main metering system. Before that it had a new Holley 600 and was doing the same thing. Tuning with wideband. It includes an assortment of rods, jets, and springs. Sometimes it unsticks and it drives perfectly fine, couple days later it wont idle right it wont have any power in 1st gear and. The rear carb is primary and as the throttle begins to open at about half throttle the forward (secondary carb) linkage begins to open. Holley carbs come with a standard shooter size which differs by carb list #. On the dyno and at the drag strip it has outpowered every Edelbrock, Demon, Holley or Holley "clone" we've ran against it. Answer If the problem your describing is that the engine bogs on acceleration you may not have the proper size of carb or correct jets installed. What about this combo can I change to. I had the problem every time I rode in slop. This is a popular carb for the small block Ford and is the trickiest Performer carb to tune. Tim Stocker Photography / Getty Images. The base portion is not an adaptor plate or a spacer, it is part of the carb, as it has sveral vacuum ports as well as the throttle mounted to it. I also used the stock throttle and cable on the FCR. As soon as I let off the pedal it smooths out. the issue i am having is i have a 1968 charger with a 383 engine stroked to 500 cu in. So essentially my engine was leaning out so bad under heavy acceleration it would bog down. Help Edelbrock 750, hesitation Discussion in 'Engine Topic' started by roscoehd, Jun 17, 2012. The adjustment should be no more than an eighth or quarter turn. I was thinking of this post as I drove the '75 Country Squire earlier. I totally rebuilt the. The first section, this one, is a FAQ type of section, and contains general carburetor and performance information. 5 to 13:1 range. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. As manifold vacuum drops under power, a spring under the rod holder raises the tapered rod out of the jet and allows more fuel to flow past, meaning the mixture gets richer. it's why I ditched the edelbrock. i noticed the idle screw is always touching the kick down lobe on the choke so im thinking i need to adjust out my idle screw so that it comes off high idle when the throttle is. Finally, check to. I've found two edelbrock accelerator pumps, blue and tan colored. The smaller ones appear to give it the right amount, however it didn't change the bog. Has a little midrange studder but not bad at all. 539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3. The double pumpers are not well suited for a 4V Cleveland on the street with mild cam, tall gears and a C6 with a stock stall. Edelbrock carb adjustment Does anyone now how to work out what jets/needle combo to use for a edelbrock performer 1405 on a 305 Chevy It feels like it bogs when the secondaries open, i know i have asked this before on a different forum and i was grateful for the advice but was too embarrassed to state that it went over my head. This will lean the accelerator pump, so I assume that the bog can be caused by too much fuel. Poster #23 [04/07/12]: I have a problem, I have spark, 140psi, proper timing, new Carb to match the larger bore, I have fuel, and it still will not run. If not, tighten in 1/8 turns until it does. I heve the timing correct and all parts are new but the vehicle "stumbles" or bogs down on acceleration. I set this guide up in four sections. Check for fuel lines too close to a heat source causing vapor lock. It will start backfiring and bogging when I go over 30mph and let off the throttle, then it bogs out till it hits 0 and stalls. All the other EBay sellers claim to have new units, but they are just rebuilt units and claiming there new. necessitate departures from theoretically ideal. Idles fine. 0 out of 5 by 3.
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