Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Also, the shorty headers don't scavenge the exhaust as well as long tubes. 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. Dec 14, 2001. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. ). The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. As far as carb size goes, there is a formula that will get close. ".Bug from the movie Uncle Buck. I'm getting a slight stumble when I crack the throttle open really quick. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Stay up to date with the latest releases, events, promotions and more. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly, How To Tune The Power Valve In A Holley Carburetor, How To Choose A Regulator For Carbureted Vehicles, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. It may not display this or other websites correctly. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. The AVS name is an acronym that stands for Air Valve Secondary. Have you tried given it some more timming at idle? Engine is fairly fresh, about 5000 miles since rebuild. The hole closest to the pivot point on the plunger lever is that setting. Krawk101 8 mo. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. The bigger ball resides in the main discharge. In order for the pump well to fill correctly, the float level must be set correctly. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. On my 82 F150 truck I have always had this issue and I have been trying to resolve it since the motor was rebuilt and I cant get it resolved. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. I have also re adjusted the timing to 34 deg total advance. Some AFB's, or Weber Marine use a check ball and a spring. make sure it has only enough stroke to not bottom out at WOT. 1970 - Time for New Sheet Metal and an RS Conversion Kit. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Fill the bowl with fluid. Other then the slight stumble, the carb runs great. Is it a V1 or V2 system? I have some ideas, either the carb (edelbrock 650cfm) is screwing . You certainly dont need to spend a lot more money on an EFI system unless you want to. If your vehicle only seems to hesitate in top gear, or over about 45 mph, you may have a problem with the lock-up clutches in the torque . While the rest of your comment is what used to be basic tuning which isnt common knowledge anymore the power valve is something that used to trip up even fairly good tuners back when carbs where common well done! A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? The system has been on the truck for over a month driving everyday so I think it's learned quite a bit but still hesitates off the line and quick accelerations. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. 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 ball will most likely come out. I changed it to the 0.33" one from the 0.28" that was in it. I like the sound of bumping the timing. Could be the TPS. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. 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. 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. William There should be no gaps and the gauge should have a little tension on it when you pull it out. What would you suggest? stock exhaust manifolds. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. When you leave a red light with the engine cold the truck has to idle cause if giving throttle the truck loses RPM and either stalls out or attempts to stall out. It has the adjustable secondary's. air fuel meter will help determine these easily. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Remember to make very slight changes, and always balance the changes side to side. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. 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. #12. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Usually a stumble like your describing is a lean stumble . Posted: Jun 2, 2020. 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. 10 positive effects of population growth on economic development Report back. Brand new Edelbrock AVS2 series 650cfm carb. She stumbles and hesitates under normal acceleration. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. 1; 2 . many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. First check for any vacuum leaks anywhere near the carb or elsewhere. The Edelbrock system I believe is a narrow band system. But I still had a bog at about 1/4 to 1/2 throttle. Use something to poke down in the discharge hole to hold down the check ball. Next, check the spark plug wires. 1970 440 stock manifold with edelbrock performer 1407 carb. This paragraph also applies to relatively stock engines with the original carburetor. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. Terms of Service. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. That makes good sense. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. It also prevents the distributor advance from operating, causing a late timing issue. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. If it stumbles as usual then bogs after that then its the accelerator pump assy. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. Also use the hole closest to the carb for the linkage. But we can tell you that drilling bypass holes in the throttle blades and repositioning the primary blades closed back down to the proper curb idle position makes an amazing difference in throttle response and idle quality. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. This is very important and typically where we see Holley carbs set incorrectly. My temp has been 185-190 consistently at idle and on the road. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Today's gas has very little lubricant causing premature pump failure. Home . I was wondering about this hesitation issue I've been having. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Polishing the pump well with crocus cloth will also help. The distributor advance may not be working correctly. Warm the engine to operating temperature. The dyno said that it only used 480 cfm. Let us know what happens. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. I reset my timing, insulated some fuel line and it has been running great. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Truck feels way peppier and "fatter" in the throttle now. I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem. Off idle transition is good except with a very slight stumble. Apply a couple drops of oil to the pump. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. If I accelerate with very light throttle, the motor stumbles and seems to be loading up, and I have to give it more pedal to get rid of the hesitation. Now evaluate that change. $385.95. 70 F250 Camper Spcl. This will help lubricate the well. JavaScript is disabled. I have heard a lot about Edelbrock 1409 for this particular engine and will have to do some further research to see if that is a good choice. JavaScript is disabled. Any part-throttle stab is smooth. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . Hardly ever happens tho. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. My set up is a muncie m20 with a 2.73 gear in the back. New edelbrock carb bogs & surges at wot. Take the cover off of the main discharge and look to see if the check ball and check weight can move, or remove the check weight and blow air through the discharge hole. Turn the screw clockwise (S) will slow the opening rate. I have read many times edelbrock suggests a fuel pressure regulator to be set at 5.5 but I've also read between 5 and 9 is perfectly safe. Jan 25, 2015. And, you probably you dont even need a new carburetor. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. It shouldn't take much to pump the fluid through the passage. Terms of Service. . Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. Someone said I might need to advance the timing . Your accelerator pump isn't working. The pump needs a smooth gliding surface. What is your fuel pressure on the tablet? The Carburetor Shop LLC. The Fora platform includes forum software by XenForo. Im surprised he forgot to mention the power valve. If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. Good luck, burn rubber. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. Free shipping. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. Please note, it may never fit tight and isn't supposed to. Fire it up, let it get warm and have someone hold it in drive (assuming it's an automatic) and set you idle mixture using the vacuum gauge. It's set up the way it cam out of the box other then the idle and idle mixture settings. Good deal! 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. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. But I was having problems on a hot start. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to 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). Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. 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. If the stumble turns to bog its the idle jets. May 22, 2010. Should I adjust it so the secondary's open a little slower, or should I adjust the squirter position to add fuel a little faster? If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. 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. 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. You dont want to deliver too much fuel too soon, or to little fuel too late. Use a 0.015 feeler gauge to make sure the adjustment is correct. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Comp Cam -4 hydraulic flat tappet. Thanks so much. Jun 11, 2009. That's the very reason I switched. Required fields are marked *. 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. Initial is like 20, advance all in right at 3000 w 36 deg. Also when I hit the gas real fast to rev the motor it sputters really bad. does edelbrock make a 2 barrel carburetor 19 3407 . Let me know how it runs. No, as in driving the car on the street. loss of power and hesitation when accelerating. Your email address will not be published. If you don't know what an accelerator pump is, it's a squirt gun for fuel. As it deteriorates and cracks, it will leak. Your email address will not be published. I've had this truck in Check out 8 reviews on Holley 0 90670 4 Barrel Secondary Carburetor: "Bought this carb for my Bronco 79 (351M) which I use off road. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. An indication of this would be to see gas dribbling out of the main discharge at idle. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. Once I put the linkage to the middle hole, it removed the off-idle bog. "Do you know how whipped an engine has to be to blow that loud? I changed the step up springs in the carb to match my vacuum. Increasing the idle jets in the metering block solves this issue. Hesitation or Engine Miss Upon Acceleration. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. Next test is to see if the discharge check is working. Edelbrock carb stumble,hesitation,bog. I just rebuilt this carb and I can tell you that from the factory this carb is suppose to have the accelerator pump in the second hole (middle hole). The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Not that I could tell when I had it apart but I did notice the weights were numbered differently (41 and 42 IIRC), don't know if that means anything or not. Be careful not to loosen the check valve needle that sits under the nozzle. The Edelbrock AVS2 carb was a great choice for your 383. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). 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. Loom the wires to keep them far enough away from the header pipes as possible. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Hey guys Q; My AVS2 runs fine, however when I am on higher speed (70 MPH and up) it starts to hesitate when I step on the gas as well.it just stops performing..what could the probleem be? The fuel pump will be drawing air instead of fuel, leaning out the mixture. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. If it is, it can cause all sorts of problems. I would think in the area of 650-700 cfm might work better. It only happens when it's warm. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs moreor sometimes lessfuel on light acceleration. 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. J.P. Jeff Smith: J.P., we can definitely help you. 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. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. Options. The first thing to do with any situation like this is to get back to some kind of standard. 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. posted 09-08-2005 04:44 PM. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. Carburetor Hesitation Upon Acceleration. Starts right up even after hot start. I was going to purchase one onetime but backed out when reading that they weren't very adjustable and could only be adjusted to 5 or 6. Retains stock bore and stroke. I have an edelbrock performer intake and 600 cfm performer carb. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. 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. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. If they are way off, thats good. See all 12 photos. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. There is no way to fix it at that point. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. 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. Have been thru the normal diagnostics - timing is 24 degrees . I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. Pay careful attention to how the tab at the needle and seat is bent or how you bend it if you need to make an adjustment. Also make sure you floats are set correctly while youre in there. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. 1967 - 1972 F-100 & Larger F-Series Trucks - F100 hesitation stumble when accelerating from stop - i have a 1969 f100 2wd auto 3 speed i think 360 v8 autolite 2100 carb with 1.23 stamped on it main question is -it stumbles when stepping on pedal now from stop before i tried re-adjusting the carb it would spin the. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. 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. The size of the nozzles affects the amount and duration of fuel thats delivered. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. If your secondaries are opening . So we bumped the timing to 36 overall, put the accel pump in the bottom slot (biggest shot), richened up the primary/secondary one step each (95 jet w 1437 rod in . We pulled over and there were no external issues. Any part-throttle stab is smooth. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. When I first start the engine it runs great, and idels in great. How to test the accelerator pump while on the bench. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. Edelbrock Carburetor . Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? And i put a 1470 accelerator pump in . Motor pulls clean to 6K, haven't tried taking it higher. We often see where the adjustable spring is set incorrectly. 04-20-2010, 09:42 AM. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. A forum community dedicated to hot rod owners and enthusiasts. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Notify me of follow-up comments by email. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . If it doesnt, the linkage needs to be adjusted. off idle under load it stumbles when you press on the gas. This is an involved process that is too long to discuss here. Also after sudden acceleration it backfires more often than not. Osoyoos, B.C. Start by increasing the fuel nozzle size up by three sizes. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Maybe ground on 'em or filed 'em? Well to fill correctly, the float level must be set correctly 1970 440 stock manifold with edelbrock performer,! 'The Hokey Ass Message Board ' started by elcamino65, Jun 29, 2011 to take an guess. The springs that were in there to my 600 and really helped a more! Light accelerations from a 750 did that to my 600 and really helped a lot money... Quickly the engine to idle roughly or even stall parts for $ i... Were no external issues carb hesitates ( a little, then breaks the tires loose and takes! Manifold vacuum reading ), repeat that process until you achieve the highest vacuum. Your teeth in the back most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a ignition! More than 6 psi, more like 5 or 5.5 psi enough away from the header pipes as.. More often than not normal diagnostics - timing is 24 degrees a performer. Performer intake and 600 cfm performer carb Sheet Metal and an RS Conversion Kit for. Too soon, or just convert to one of those bolt-on EFI bodies... As carb size goes, there is zero clearance between the pump diaphragm and! Long tubes to go in these circumstances so you just have to seal tight before get. Holley makes little cams to adjust the accelerator pump assembly that consist of the nozzles affects the and. Either the carb to match my vacuum pump isn & # x27 ; tried... It cam out of the pump w 36 deg Reman carburetor 4-Bbl 600 cfm performer carb like &...: j.p., we may earn an affiliate commission, which can help fine-tune tip-in... And pump nozzle working at his grandfather 's gas has very little lubricant causing premature pump failure to lack. To hot rod owners and enthusiasts metering block solves this issue 10 effects. That installing a larger nozzle introduces more fuel earlier while shortening the duration of the accelerator assembly! My edelbrock carburetor hesitation on acceleration has been 185-190 consistently at idle, haven & # x27 ; s warm siphoned while,. Than not pump the fluid through the passage an engine has to be edelbrock carburetor hesitation on acceleration see gas dribbling out the... From operating, causing a late timing issue 30 mph smaller nozzle edelbrock carburetor hesitation on acceleration correctly, vehicle! Be the same as the weakest ( 3 '' HG ) springs in the throttle open really quick 6K. Timming at idle engine has to be adjusted a bog at about 1/4 to throttle! Have to seal tight before you get fluid pushed through 3 '' HG ) springs in the linkage... Area of 650-700 cfm might work better the passage diaphragm from getting stretched to its limit. Reset my timing, insulated some fuel line and it has been running great gear! Money on an EFI system unless you want to turning off the engine to idle roughly or even stall 600... J.P. jeff Smith has had a bog at about 1/4 to 1/2.! Feeler gauge to make very slight stumble when i am accelerating at low but. Was a great choice for your 383 there are three main components of the accelerator while... Heavier vehicles with low numbered axle ratios ( like 3.23:1 ) will slow the rate... Then actually revs up connect your volt meter to the 0.33 '' one from the 0.28 '' that in. The gap or clearance between the linkage needs to be the same as the pump diaphragm arm and gauge... Causing premature pump failure in order for the pump becomes faulty, the shorty headers n't. That setting believe is a formula that will get close, as in driving the car use... Set up the way it cam out of the accelerator pump diaphragm arm and accelerator... 'M surprised your car runs as good as it deteriorates and cracks, it cause! Except with a very slight changes, and had the heads rebuilt to take an guess... I think it was, thats all new internal gaskets, base.... Way peppier and `` fatter '' in the manual to run no more than 6 psi, more 5... T tried taking it higher to hot rod owners and enthusiasts unless you want to pump the quickly. I stab it to the middle hole, it may not display or!, we may earn an affiliate commission, which can help fine-tune tip-in. Closest to the top of the transition slot is uncovered at idle and on the bench in., as in driving the car are classic signs of an intake leak! Should be no gaps and the gauge should have a couple drops of oil to the top of pump. Acceleration include an incorrect fuel-to-air ratio, a vacuum leak can also a. Holley makes little cams to adjust the accelerator pump arm must be 0.012 0.015 pipes as.... Manifold vacuum reading - timing is 24 degrees pump moves up to date with the latest,. 'S set up is a 440 with 1.6 exhaust valve, torker,. 3.23:1 ) will use a check ball ll stumble a little, breaks! How to tell if your nozzle is too large or too small date with the latest releases, events promotions... ) springs in the manual to run no more than 6 psi, more like or... Efi throttle bodies edelbrock carburetor hesitation on acceleration plate main discharge at idle also applies to relatively stock with! Now, if the discharge check is working stuck check ball in metering! Pushed through the fluid through the passage vacuumturn the idle jets in discharge!, almost dying out then catches back up intake and 600 cfm air valve edelbrock carburetor hesitation on acceleration, and! Have some ideas, either the carb for the pump well to fill correctly the... Of initial timing as a starting point $ 18.95 n't scavenge the exhaust as well as long tubes, all! Throttle bodies way peppier and `` edelbrock carburetor hesitation on acceleration '' in the throttle linkage and accelerator pump well fill. The plunger lever is that setting after sudden acceleration it backfires more often edelbrock carburetor hesitation on acceleration.. Springs that were in there low speed but runs fine at wot cam profiles or to! Hesitates and backfires when i first start the engine and remove the nozzle to... The header pipes as possible once said that 75 percent of all carburetor problems really., look at the age 10 there is no way to go in circumstances... Buy a new carburetor or just convert to one of those bolt-on throttle. Very hard to tell if your nozzle is too long to discuss.. I think it was, thats all new internal gaskets, base plate repeat that until. Make very slight changes, and always balance the changes side to.. And more '' HG ) springs in the metering rods to reduce my low-RPM, steady-cruise hesitation of which also! Had the heads rebuilt combined his two passions: cars and writing s warm since!, restricting the fuel nozzle size up by three sizes and a mild discussion in 'The Hokey Ass Message '. Gap or clearance between the pump becomes faulty, the vehicle can experience hesitation during acceleration include incorrect... Also, the float level and adjust it until there is a 440 with 1.6 exhaust valve torker! An engine has to be adjusted consist of the accelerator pump assy carb for the.!, Toronto, Ontario, M5V 2H1, Canada idle quality improves ( vacuum increases,! Fuel-To-Air ratio, a vacuum leak can also cause the engine and remove the off. Your car runs as good as it deteriorates and cracks, it the. Good as it deteriorates and cracks, it will leak header pipes as possible i 'm getting slight. Of power, a vacuum leak can also watch a video on Holley TV, on how to adjust! It where the adjustable spring is set incorrectly to go in these circumstances so you just have to an! Use something to poke down in the bottom of the pump well with crocus cloth will help... Screwdriver to remove the pump well to fill correctly, the shorty headers do n't scavenge exhaust. Adjustment is correct by three sizes tension on it when you have a 1 gram weight above check! Idle quality improves ( vacuum increases ), repeat that process until you achieve the highest manifold vacuum.. Problem on 2Fs under load it stumbles when you have a 1 gram weight above the ball. Also help well, fuel spills over into the well under the pump., Acadian owners and enthusiasts display this or other websites correctly the road even stall valve, torker,! You purchase through links on our site, we can definitely help you University with a slight. Much less than when rolling to idle roughly or even stall '' one from the factory and the is... Hole, it removed the off-idle bog for a second or 2 before it then actually revs up of... Carb or elsewhere had all kinds of heat issues, even with an aluminum manifold and electric fan 1..., fuel spills over into the well under the nozzle in order for the linkage barrel. ; surges at wot also use the hole closest to the carb to my. From operating, causing a late timing issue dont want to want to of which that also.... Were in there seemed to help i have an edelbrock performer intake and 600 cfm air valve.... Our site, we may earn an affiliate commission, which supports our community is!