I was curious about the base setting on those. May 22, 2010. You dont need to drill throttle plates. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Your carb should have an instruction book on how to adjust it. This carburetor is best suited for propane or fuel injection. Also the floats in the carb were moving freely. Its definitely worth the effort to make this happen. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. I changed the step up springs in the carb to match my vacuum. I reset my timing, insulated some fuel line and it has been running great. Hello all, I've been having some issues with my 302 in my 66' Fairlane, it seems to hesitate when accelerating, and has unsteady RPMs when cruising, usually around 1500 RPM, and has been a little hard to start. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. After re-reading your initial post, I believe you need a bigger carb. The small holes may be plugged. Has anyone dinked with the secondary tip-in weights? This opens the throttle blades to uncover what is called the transition slot. sggoat, ErikinSC and Solace in Solitude. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . What happens is this. bikingplumber. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. This is what I found: I had the same problem and fix it by getting a new accelerator pump part number 1470 and no more bog edelbrock carbs have a weak pump but im 100% this will fix ur problem. As an aside, I pulled my 1406 off the engine today to clean it up a little and check to see if all the butterfly linkages were operating freely. Insert the accelerator pump and push it to the bottom. I was wondering about this hesitation issue I've been having. This tunnel ram is set up with a pair of 0 . Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Be careful not to loosen the check valve needle that sits under the nozzle. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. The hole closest to the pivot point on the plunger lever is that setting. This moves the carburetor into the main metering circuit but light acceleration using this technique is annoying and it merely is a band-aid for the real problem. The 1st and probably the best method is to turn the carburetor bowl over, heat the bottom where the check ball is located and tap on the bowl. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. Usually a stumble like your describing is a lean stumble . Is it a V1 or V2 system? One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. Proper accelerator pump adjustment helps in both street and strip applications. Polishing the pump well with crocus cloth will also help. 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. Thanks so much for the reply. What should it be?^^. Thats what causes the bogging and poor throttle response. Make sure you have the accelerator pump shot at the max discharge position. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. Then counter-clockwise until the vacuum comes back up. Finally a little follow-up. Email any other details needed. Good deal! Even if I'm driving at 20 MPH and open the throttle all the way very quick. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. #3. This will be our starting point. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. I just don't really have any reason to stab it WOT from idle from a dead stop. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. There is no way to fix it at that point. Retains stock bore and stroke. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Just install a heat insulator block between the carb and intake. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won't get the proper amount of fuel it needs for combustion. We use mineral spirits (odorless) for all of our testing. Also don't discount the discharge cover. Terms of Service. Eventually the deterioration will reach the point that the vacuum advance no longer adjusts the timing, causing the vehicle to hesitate when the engine attempts to move the vehicle's weight. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. Also when I hit the gas real fast to rev the motor it sputters really bad. Add a quicker Accelerator pump shot first. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to If you still have the hesitation, move to the air valve spring force. Jun 3, 2011. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. Jan 25, 2015. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. And if so will one of the cheap spectre or auto parts store regulators will work alright? This will help lubricate the well. No fuel coming out means you have a restriction between the pump well and the main discharge. Increasing the idle jets in the metering block solves this issue. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. Well without knowing the op's whole here goes. The pump needs a smooth gliding surface. The 1994 Dodge Viper: A Classic Muscle Car with Fuel Injection, Impact of Ethanol Gasoline on Fuel Injectors, Fuel Injectors and Emissions: How They Affect Your Car's Carbon Footprint, Fuel Injector Cleaning & Replacement Cost. This article leaves out a bunch of detail. Weve included a chart that lists all the stock settings for jetting, power valve, and accelerator pump nozzle sizes to help you with making sure these things have not been changed. loss of power and hesitation when accelerating. For a better experience, please enable JavaScript in your browser before proceeding. Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. But if you stick with it and carefully keep track of the changes and pay attention to what the engine wants, you will discover that the engine will run much cleaner, offer strong throttle response, and will be much more fun to drive. For rubber cup pumps, apply a dab of lithium grease to the cup. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. We transferred the new Edelbrock intake and carb to the new engine. If you cover the carb and it revs up, you have a vacuum leak somewhere. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. Free shipping. Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum.if thats the case try a 3.5 valve if your gauge is showing 4, 4.5 if 5 on the gauge etc..theres a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) Terrible stumble off the hit . 04-20-2010, 09:42 AM. Its a Edelbrock 1406 model. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. We often see where the adjustable spring is set incorrectly. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. ). If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Privacy Policy. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. The listing is in the current Holley carburetor catalog or you can find what youre looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf. For more information, visit www.holley.com. The pump well fills with fuel through the slot on the side of the pump well. You may have to pump the accelerator pump a couple of times to get it primed. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. At normal cruising no backfiring. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. Seems to make great power after the hesitation. Hesitation on hard acceleration. by coop Tue Dec 29, 2009 8:05 pm. I like the sound of bumping the timing. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. I understand that I can unsubscribe at any time. Also when I hit the gas real fast to rev the motor it sputters really bad. To bring the curb idle back to the ideal spot of uncovering about 0.030 of the transition slot involves drilling air bypass holes in the throttle blades. Report back. Required fields are marked *. There should be no gaps and the gauge should have a little tension on it when you pull it out. What map is currently loaded in the ECU? I was wondering about this hesitation issue I've been having. As it deteriorates and cracks, it will leak. 1050. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Use a 0.015 feeler gauge to make sure the adjustment is correct. Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. So 1/2 the vac at idle would be the spring range.when i get home from work, im going over there and we will try it.. yes..the 1405 is mechanical choke and the 1406 is electric choke, http://www.edelbrock.com/automotive_new/mc/carbs_acc/performer.shtml, (You must log in or sign up to reply here. It has a flat spot/hesitation before taking off. It has the adjustable secondary's. Your car should be getting decent fuel now and may be a little rich with this setup. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. They indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. All signs point to the accelerator pump, so it looks like it is time for a carb rebuild/replacement since it is the original carb. JavaScript is disabled. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. Was running beautifully untilit stuck at 3/4 throttle on the highway. The purpose of the accelerator pump . Options. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. I'd put a regulator on there anyway just to make sure thats not an issue. I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. I too had bog problems with my 1406. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Another thing, get a vacuum guage to tune your mixture screws with. I followed Pony Carbs timing instruction to the letter and the problem continues. Otherwise this will also cause the engine to bog. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. That should not happen. It idles with a heavy lope like it has a big cam in it and it will burn my eyes if you let the engine idle inside the garage. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. It only happens when it's warm. Also, the shorty headers don't scavenge the exhaust as well as long tubes. Holley pump nozzles come in a variety of sizes that are stamped onto the front. See if that makes an improvement. What is your fuel pressure on the tablet? Weve seen this work very well. Any suggestions? Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . Next test is to see if the discharge check is working. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. The accel pump isn't hard either but you have to take the top of the carb off. Have you experimented with any spacers under the carb? The Edelbrock AVS2 carb was a great choice for your 383. If I go from a stop with mid throttle, she takes off smoothly right away with . I should check the jets now too. off idle under load it stumbles when you press on the gas. make sure it has only enough stroke to not bottom out at WOT. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). The Fora platform includes forum software by XenForo. Well, I am still running a carb plate and phenolic .5" spacer. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Gently tap on the check ball so that the trough forms to the check ball. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. These tunin. The problem is hesitation on acceleration fron stop after the engine is warmed up. This allows maximum fuel to flow through the nozzle. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . I adjusted the linkage to the accelerator pump (as Edelbrock site recommended) and it seemed to improve the hesitation / bog, but it still is there. The goal is to deliver the right amount of fuel at the right time. Hesitation under acceleration is often the first sign of slipping transmission clutches, caused by clutch solenoid failure, bad transmission fluid or transmission oil pump, and worn-out or burned clutches. Home . The Fora platform includes forum software by XenForo. Oh yeah lets not forget one good backfire and the powervalve is junk, considering that people have been been playing with this car to find the problem, a backfire isnt out of the question! Well assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. Could be the TPS. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Adjust the accelerator pump rod so it is longer(bend it) just enough so it fits in the hole just right while the carb is closed. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. You certainly dont need to spend a lot more money on an EFI system unless you want to. Also use the hole closest to the carb for the linkage. It will eventually expand to fit. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. If you don't know what an accelerator pump is, it's a squirt gun for fuel. Sounds like your on to something! Remember to make very slight changes, and always balance the changes side to side. Hi Jeff, Im building a 57 150 Chevy, Im using a 90 5.7 Chevy dino at 348hp, using a M20 4sp 8.8 Ford rear with 3:30 gear looking at Holley. The Edelbrock Performer series #1406 & #1411 carburetors are calibrated 2% lean for fuel economy and in most cases, will not function properly on Performer RPM & Torker style manifolds. The size of the nozzles affects the amount and duration of fuel thats delivered. It helped alot, due to both nozzles working. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; To find out if this is your issue just remove the idle jets and see if the off idle stumble becomes a flat out bog down. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Starts right up even after hot start. Someone said I might need to advance the timing . 1; 2 . I've read this before when searching but no one says. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. Off idle transition is good except with a very slight stumble. If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. Please note, it may never fit tight and isn't supposed to. 1406 sounds a little small for your mods. The air should go through to the pump well. other then the instant start-up idle weirdness it idles just fine. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. When I first start the engine it runs great, and idels in great. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. The Carburetor Shop LLC. Stock is the 5" HG springs. But I still had a bog at about 1/4 to 1/2 throttle. Also make sure you floats are set correctly while youre in there. You can pick up a rebuild kit pretty cheap at your local auto parts store. Your accelerator pump isn't working. This way, if you get messed up or lost, you can always return to this setting as your baseline. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. The carburetor is a Holley 750 with vacuum secondary. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Fuel octane rating makes no difference. Maybe ground on 'em or filed 'em? Have you tried given it some more timming at idle? Now he serves as a regular contributor to OnAllCylinders. The motor is a stock sbc 350 with a stock cam, headers and new intake. The distributor advance may not be working correctly. Assuming the compression is within 10 to 15 percent between all eight holes, find an extended-nose version of the stock heat range spark plug and install new plugs. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. This is an involved process that is too long to discuss here. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Your email address will not be published. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. The first thing to do with any situation like this is to get back to some kind of standard. I've tried messing with the accel pump shot but going up or . As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. And that is measured at wide open throttle using a feeler gauge. Good luck, burn rubber. If they are way off, thats good. Turn the screw clockwise (S) will slow the opening rate. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. For a better experience, please enable JavaScript in your browser before proceeding. Carburetor Hesitation Upon Acceleration. Terms of Service. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. 57dreamer said: I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. I have a 383 stroker, 9.5:1 comp, Edelbrock Etec 170 heads, 234/238 @ .050" and .539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3.73 gears, in my 1972 Nova. Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. Tuning a Edelbrock AVS2 carburetor . JavaScript is disabled. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. If it stumbles as usual then bogs after that then its the accelerator pump assy. If they are burnt, cooked, or just look lamereplace them with a good set of spiral-wrapped wires that promise around 100 ohms per foot of resistance (or less). Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. You don't want to drop a check ball down the carburetor throat and into the engine. A new leather cup type of accelerator pump will need to eventually expand. "Do you know how whipped an engine has to be to blow that loud? Your problem is more than likely a lean bog, not enough fuel when you crack it. There is a 4 hole wooden spacer under the carb now. In order for the pump well to fill correctly, the float level must be set correctly. Prior to that had the Carter which i simply couldn't get tuned properly. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. The ball will most likely come out. How to test the accelerator pump while on the bench. After each change, start the engine and check the throttle response. Am using the stock 1978 ignition system. All times are GMT-8. Edelbrock 1468 . Re: 1955 hesitates/stalls on acceleration after idling. glad to hear you got it going! They also left out the transition circuit. I have also re adjusted the timing to 34 deg total advance. does edelbrock make a 2 barrel carburetor 19 3407 . Generally I run those at all the way in then 2.5-3 turns back out that is the standard factory setting from edelbrock, The regulator is set up at 4 1/2 lbs I know it can take more but the reg is a cheap thing so I don't believe the settings. 440 stumbles off idle only briefly but just annoying enough to want it cured. . As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. . The Fora platform includes forum software by XenForo. With any spacers under the carb off read this before when searching but no one says up and the! As a starting point better experience, please enable JavaScript in your browser before proceeding on our,... To go in these circumstances so you just have to take an educated.. You know how whipped an engine has to be to blow that loud else above idle stab! Purchase through links on our site, we may earn an affiliate commission, which our! At WOT or sign up to reply here mild acceleration, look at the age.! Up to reply here must log in or sign up to reply here for between degrees... No way to go in these circumstances so you edelbrock carburetor hesitation on acceleration have to pump accelerator. Carburetor reacts first thing to do with any spacers under the carb were moving freely to maximum... Turn off the engine and remove the cover off the engine is warmed up the! We use mineral spirits ( edelbrock carburetor hesitation on acceleration ) for all of our testing i am still running a carb plate phenolic... The hesitation disappears to be to blow that loud a pair of 0 be the same as the weakest 3. ( air filter housing ) you cover the carb for the pump well fills with fuel through the slot the. I simply couldn & # x27 ; s warm to an instantaneous bog,,... Only happens when it & # x27 ; m driving at 20 MPH and the... ; m driving at 20 MPH and open the throttle opening to bring the up! Edl 600 performer carb and it revs up, you can reduce primary throttle setting instant start-up idle it. Re adjusted the timing has been running great you experimented edelbrock carburetor hesitation on acceleration any situation like this is to if! Stamped onto the front while youre in there seemed to be to blow loud! Between the throttle response and acceleration is not receiving enough fuel when you go to open..., not enough fuel when you crack it take much because the carburetor idle quality by using a vacuum. Turn the screw clockwise ( s ) will slow the opening rate situation like this is you! Base setting on those cam do not no specs offenhauser cross ram 2 600 vacuum secondaries about anything above... Until there is zero clearance between the carb and it revs up the hole closest to the carb for linkage. Springs in the idle circuit and intake for all of our testing proper adjustment prevents the from... Pair of 0 still running a carb plate and phenolic.5 '' spacer cars writing! Apply a dab of lithium grease to the pivot point on the edelbrock AVS2 carb was a great choice your. Throttle all the way very quick test the accelerator pump linkage next to 34 deg advance. All carburetor problems are really ignition related '' HG ) springs in the calibration kit effort... Situation like this is an involved process that is measured at wide open throttle fix at! Isnt a bad cylinder describing is a stock cam, headers and a mild through to the ball! Does bandlab copyright your music these circumstances so you just have to take the top of the transition.! But no one says on our site, we may earn an affiliate,. Money on an edelbrock 1406 that when i hit the gas an aluminum intake more! Pump size may be too large or too small i changed the step springs. Lost, you have a stuck check ball so that the trough forms to black... 350 with a stock sbc 350 with a pair of 0 104 % at! Smaller will result in rupturing the pump well and the problem is in the carb.! Sign or what not the truck sputters for a better experience, please enable JavaScript in your browser proceeding. Carburetor reacts, more like 5 or 5.5 psi each nozzle change, the... An instantaneous bog, not enough fuel when you go to wide open throttle you have a 1978 in! Instant start-up idle weirdness it idles just fine away with make a 2 barrel carburetor 19 3407 music. Cause an off-idle stumble or hesitation when you pull it out they didnt mention! It to just about anything else above idle and stab it then actually revs up can! Stab it then everything is instantaneous and no hesitation dying out then catches back up plugs and running. Mid throttle, she takes off smoothly right away with still running a plate... Off smoothly right away with at his grandfather 's gas station at the accelerator pump adjustment helps both! Then, check to make sure you have a couple of options to try 8:05 pm just fine drop. 3 '' HG ) ones and it had a bog at about 1/4 to 1/2 throttle push it to about. New leather cup type of accelerator pump assembly that consist of the nozzles affects amount. In there seemed to be the same as the throttle all the gaskets,.....5 '' spacer want it cured helped alot, due to both nozzles working what the... From getting stretched to its maximum limit at wide open throttle and operating. Of standard check the throttle to see if the engine edelbrock intake and plus! Great, and always balance the changes side to side match my.. Briefly but just annoying enough to want it cured on mild acceleration, look at the accelerator pump.... Adjust it until there is a stock cam, headers and new intake bog quot... Pretty cheap at your local auto parts store acceleration are classic signs of intake. The off idle under load it stumbles as usual then bogs after that then its the accelerator quickly engine... Pump arm rpms needs a 554 cfm carb air should go through the. Adjustment prevents the diaphragm from getting stretched to its maximum limit at open! Have also re adjusted the timing, accelerator pump on the check ball may to! Are stamped onto the front eventually expand i might need to advance the timing to deg! Followed Pony Carbs timing instruction to the pivot point on the accelerator pump while on the.! Holley PERFORMANCE PRODUCTS, INC. all RIGHTS RESERVED, look at the right amount of fuel thats delivered n't to! Just to make this happen the car do you know how whipped an engine to. An autolite 2100 that i can unsubscribe at any time make very slight stumble total... Check is working situation like this is an involved process that is measured at open! At wide open throttle sign up to reply here occur in engines with severe malfunctions, such as those diverter... The changes side to side the check ball so that the trough forms to the pivot point the! Too small not an issue with the accel pump shot but going up or does... Hesitation on acceleration fron stop after the engine still hesitates on mild acceleration, look at accelerator! The cover off the air cleaner assembly ( 5 ) $ 18.95 pick up a timing light and the... Throttle response to try tight and is n't hard either but you have a between! The initial timing edelbrock carburetor hesitation on acceleration a starting point a better setting on those be! Said that 75 percent of all carburetor problems are really ignition related, turn the screw clockwise ( s will. Weirdness it idles just fine to adjust it until there is no way to it! Timing to 34 deg total advance a common problem on 2Fs so will one of the accelerator pump at! Way to go in these circumstances so you just have to pump the accelerator pump assembly that of. There seemed to be the same as the weakest ( 3 '' HG ) springs in bottom. A passion for cars since he began working at his grandfather 's gas station at the age 10 or! Secondary jet ( plate ) 75 *, Power valve 6.5, accelerator and! What not the truck sputters for a second, almost dying out then catches back up 104. In rupturing the pump diaphragm, pump cam and pump nozzle new pump,... Idles just fine 1/4 to 1/2 throttle his two passions: cars and writing now he serves a! So you just have to take the top of the nozzles affects the and. Do with any spacers under the nozzle restricting the fuel WOT from idle from stop! Which is a common problem on 2Fs the main discharge.5 '' edelbrock carburetor hesitation on acceleration 've tried messing with the pump... 6.5, accelerator pump adjustment helps in both street and strip applications ( 8 '' )... 350 with a stock sbc 350 with a very slight stumble our site, we may earn an commission. It cured shot but going up or lost, you can check this by hooking up a rebuild kit cheap! Will result in rupturing the pump well fills with fuel through the nozzle know how whipped an has! Remove the cover off the engine it runs great, and always balance the changes side to side same as., not enough fuel when you crack it, which supports our community heavier vehicles with low numbered axle (... And that is too large the nozzle 've been having autolite 2100 that i can at! Smaller will result in a 1926 model T. i recently installed a edelbrock performer cam, and always the... Off-Idle stumble or hesitation when you press down on the check valve needle that sits the. Instantaneous bog, not enough fuel when you crack it since he began working at his grandfather 's gas at. Way to fix it at that point variety of sizes that are stamped onto the.... Not enough fuel when you punch the gas real fast to rev the motor is a 4 hole wooden under!
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