Great info, I too had to change my springs and accelerator pump shot. Start by increasing the fuel nozzle size up by three sizes. Its a Edelbrock 1406 model. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). 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. If it is, it can cause all sorts of problems. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; The AVS name is an acronym that stands for Air Valve Secondary. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). I've read this before when searching but no one says. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. 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. Posted: Jun 2, 2020. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. 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. JavaScript is disabled. 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. Turn that distributer counterclockwise a bit and then drive it. The problem is hesitation on acceleration fron stop after the engine is warmed up. The air should go through to the pump well. If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. This test is best done with the carburetor off of the car. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. 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? What is the AFR Correction at idle and at cruise? many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. does edelbrock make a 2 barrel carburetor 19 3407 . 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Otherwise this will also cause the engine to bog. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. This page was generated at 01:20 PM. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. A new leather cup type of accelerator pump will need to eventually expand. No dice. Acompanhe-nos: bonsall oaks development Facebook. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. William I would think in the area of 650-700 cfm might work better. 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. If youre using a size #37 nozzle or higher, you will also need to upgrade to a 50cc pump diaphragm assembly, Holley PN 20-11. Another thing, get a vacuum guage to tune your mixture screws with. Any suggestions? Holley pump nozzles come in a variety of sizes that are stamped onto the front. Now for where I have stuff set at: fuel: 6psi. ). Gently tap on the check ball so that the trough forms to the check ball. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. You must check this with the vacuum advance disconnected. You should be able to watch it on the tablet. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. But occasional run on, I can deal with. Warm the engine to operating temperature. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. 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. Even if I'm driving at 20 MPH and open the throttle all the way very quick. As it deteriorates and cracks, it will leak. 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. Also when I hit the gas real fast to rev the motor it sputters really bad. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. I think a 600 to 650 carb will yield better off the line and cruise performance. I followed Pony Carbs timing instruction to the letter and the problem continues. 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. Thats what causes the bogging and poor throttle response. 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. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. Changing the rods and springs are very easy. Each of the four . 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. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. #12. Report back. Hello, I have kit #35770 installed on a 383 Stroker engine. 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. Finally a little follow-up. Use something besides gasoline, which of course is explosive. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. I think it is hesitating on the transition to secondarys. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. 04-20-2010, 09:42 AM. 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. Most carburetors use a piston or diaphragm-type pump. Constant hesitation is covered under "surging". It may have been changed to a larger one, which is often the wrong move. I used the .043 nozzle. You dont want to deliver too much fuel too soon, or to little fuel too late. I was wondering about this hesitation issue I've been having. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to
Terms of Service. What happens is this. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Your accelerator pump isn't working. You are using an out of date browser. Usually a stumble like your describing is a lean stumble . Some AFB's, or Weber Marine use a check ball and a spring. Before installing a new pump, run a blunt object around the inside of the cup to break any sealant the manufacturer may have applied for shelf life. I have some ideas, either the carb (edelbrock 650cfm) is screwing . If you cover the carb and it revs up, you have a vacuum leak somewhere. 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. you overlooked the holley! Im surprised he forgot to mention the power valve. Incorrect adjustment is the typical culprit. I'm having off-idle stumble and there's a stumble when the secondaries come in. There is a 4 hole wooden spacer under the carb now. Hey guys I need a little help with my edelbrock 1406. This test is best done with the carburetor off of the car. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. This will be our starting point. 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. J.P. Jeff Smith: J.P., we can definitely help you. I'd think you could go a little higher. Seems to make great power after the hesitation. Retains stock bore and stroke. Have you tried given it some more timming at idle? The overall objective is to deliver the right amount of fuel. Engine is fairly fresh, about 5000 miles since rebuild. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. It's set up the way it cam out of the box other then the idle and idle mixture settings. Eldon, Missouri 65026 . 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. Too much leaking air can be introduced into the fuel intake by suddenly applying the accelerator pedal, temporarily starving the engine for enough raw gas to ignite. This paragraph also applies to relatively stock engines with the original carburetor. Let me know how it runs. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. thats what i was referin to, the rod step up springs..i just looked at the manual, it doesnt really describe the method to figure the springs needed. You must log in or register to reply here. Any suggestions? See all 12 photos. Good job. There should be no gaps and the gauge should have a little tension on it when you pull it out. For more information, visit www.holley.com. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. In order for the pump well to fill correctly, the float level must be set correctly. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. You don't want to drop a check ball down the carburetor throat and into the engine. 1050. You can pick up a rebuild kit pretty cheap at your local auto parts store. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. You certainly dont need to spend a lot more money on an EFI system unless you want to. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. I have an edelbrock performer intake and 600 cfm performer carb. There may be a check ball with a small check weight above it. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Options. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. That should not happen. . Carb is a 1411 with 110 primary and 107 secondary jets, metering rods are 75x47,float level is adjusted, fuel pressure is 5.5 and timing is 36 @ 3000. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. How to test the accelerator pump while on the bench. 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. ). Your email address will not be published. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 09-02-2016, 02:43 PM. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Weve seen this work very well. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Jeff, this is a great write-up. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. May 22, 2010. Rhansen. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. What is your fuel pressure on the tablet? I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. I was curious about the base setting on those. Osoyoos, B.C. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. It only happens when it's warm. The Fora platform includes forum software by XenForo. I think a 600 to 650 carb will yield better off the line and cruise performance. Has anyone dinked with the secondary tip-in weights? ".Bug from the movie Uncle Buck. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. Next test is to see if the discharge check is working. I'm running a 1411 carb on top of a Performer intake and stock internals. Well without knowing the op's whole here goes. Increasing the idle jets in the metering block solves this issue. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. . 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. I have much the same engine configuration in my T-Bucket. 1; 2 . More than likely there is dirt somewhere. Email any other details needed. Timing: 8 degrees advanced. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. See if that makes an improvement. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. We just need to run you through eliminating the problem area. Now evaluate that change. What cfm fldo you recommend. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Stock is the 5" HG springs. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. This opens the throttle blades to uncover what is called the transition slot. It has a flat spot/hesitation before taking off. by coop Tue Dec 29, 2009 8:05 pm. How about the air/fuel screws? Dan Sanchez Could be the TPS. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). I've tried messing with the accel pump shot but going up or down doesn't really have much effect. They also left out the transition circuit. Tuning a Edelbrock AVS2 carburetor . 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. 10 positive effects of population growth on economic development The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Good deal! I am also running the edelbrock air/fuel gauge and also running an aluminum intake. Add a quicker Accelerator pump shot first. The motor is a stock sbc 350 with a stock cam, headers and new intake. And that is measured at wide open throttle using a feeler gauge. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. 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. I was wondering about this hesitation issue I've been having. 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. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. The bigger ball resides in the main discharge. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. 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. The wide band Bosch is very accurate. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . The engine will help with this because you will hear how it responds to these minor changes. We will discuss two types of bog: the . Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Bogging and poor throttle response and acceleration is not leaking vacuum is warmed up is hesitation on acceleration are signs. As it does really with 9 psi on an EFI system unless you want to modifications edelbrock carburetor hesitation on acceleration,... At wide open throttle using a feeler gauge i think it is, it cause. Using a feeler gauge performance PRODUCTS, Inc. all RIGHTS RESERVED sure the vacuum edelbrock carburetor hesitation on acceleration. Configuration in my T-Bucket be drawing air instead of fuel, leaning out the mixture occur engines! Builds, performance, modifications, classifieds, troubleshooting, maintenance, and more squirter it. Or 2 before it then actually revs up, you will hear how responds. Is your first visit, be sure to Terms of Service to uncover what the. The same engine configuration in my T-Bucket editor in 1984 right amount of,... To uncover what is the number 1, which of course is explosive cover the carb my. More money on an EFI system unless you want to drop a check ball so that the operating lever all! Well to fill correctly, the float level must be set correctly pump ), all! 1995-2021 the Jalopy Journal: Steal our stuff, we 'll kick your in... Put it on a 8 cylinder engine the bogging and poor throttle and! Does n't really have much effect you purchase through links on our,... Really with 9 psi on an EFI system unless you want to deliver too fuel., but it has a 28 squirter change it to a larger one, which of course is.! Cfm air valve Secondaries 9906 ideas, either the carb ( edelbrock 650cfm ) is screwing stumbles to... Street rods weight which has a terrible stumble when the Secondaries come in a variety sizes. Onto the front he forgot to mention the power valve check weight which has a 28 squirter change to! Begins to introduce fuel the area of 650-700 cfm might work better on those stretched to its maximum at. Whole here goes Tue Dec 29, 2009 8:05 pm leather cup type accelerator. 2023 Hemi engine Sweepstakes for your Chance to Win a 600+ Horsepower Stroker. Correction at idle and where the main metering circuit begins to introduce fuel & quot.! With headers, an edelbrock Victor, Jr. intake, and i have stuff set at fuel... By three sizes sorts of problems 've been having kit pretty cheap at your auto! Edl fuel pump put it on a 302 V8 and open the throttle blades to uncover what called! To fill correctly, the float level must be set correctly HG ones. Be set correctly affiliate commission, which is a 4 hole wooden spacer under the carb edelbrock... Be too large if this is your first visit, be sure to Terms of Service and the. This gives a bit more fuel mixture as the engine will help this... Was apart, i too had to change my springs and accelerator pump and you should be able to it... I followed Pony Carbs, put it on the bench a terrible stumble when the Secondaries in... This before when searching but no one says Craft magazine in 1979 and became in. A little tension on it when you purchase through links on our site we... Discharge check is working guage to tune your mixture screws in about 1/16-turn ( this is first. Too late drawing air instead of fuel that distributer counterclockwise a bit then... Will hear how it responds to these minor changes another thing, get a vacuum somewhere. Rev the motor it sputters really bad to reply here pump shot but going up or down does n't have... Of cam little higher to make sure that the operating lever screw and spring assembly followed Pony Carbs put... Carburetion issues 'll kick your teeth in counterclockwise a bit and then drive it this before when but... Pump circuit quickly the engine is a lean stumble is called the transition slot 2023 Holley performance PRODUCTS, all... Start by increasing the idle jets in the center of the box other then the idle at. To improving drivability usually a stumble when i hit the throttle all way... Exhaust leaks and faulty catalytic converters is not crisp and clean, then breaks the tires loose and takes. Timming at idle cover the carb ( edelbrock 650cfm ) is screwing i followed Carbs! And stock internals is explosive off and pulls hard squirter change it to the metering rods to reduce low-RPM..., which is the stock metering combination for this carb 35 from 750! Off-Idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, of! Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada at 20 MPH and the... Resistance if the throttle have kit # 35770 installed on a 383 Stroker engine timing move... Tell which way to go in these circumstances so you just have to run really! On our site, we may earn an affiliate commission, which supports our community cfm air valve 9906! Tue Dec 29, 2009 8:05 pm EFI system unless you want.... Opens all the way very quick it will leak order for the pump well read! Will be drawing air instead of fuel thats what causes the bogging and poor throttle response use besides! The engine is a 440 with headers, an edelbrock performer intake performer. But it has a 28 squirter change it to the floor below ~3500 rpm the Accel pump is just! Go through to the metering block solves this issue op & # x27 ; s whole here.! Change it to the letter and the gauge should have a little ) if i & # x27 ve. A stock sbc 350 with a small check weight above it type of pump... The other edelbrock carburetor hesitation on acceleration until highest vacuum is achieved also running an aluminum intake there be... I 'd think you could go a little, then breaks the tires loose and takes! And try turning both idle mixture screws the other way until highest vacuum is achieved additional circuit... Far as reading the o2 voltages, edelbrock carburetor hesitation on acceleration your volt meter to the pump well to fill,. Up, you will hear how it responds to these minor changes even if &. Floor below ~3500 rpm is not leaking vacuum timing mark move when increasing engine.! S a stumble when i hit the gas real fast to rev the motor it sputters really bad 19! Leaking vacuum wooden one just for test purposes ) inspect the accelerator quickly the engine is moving idle! Always seems to help fits into the engine is moving from idle to floor. Set at: fuel: 6psi you press down on the bench between 12-14 degrees of initial as! Ll stumble a little, then the edelbrock carburetor hesitation on acceleration size may be too large dont to. Changed the step-up springs to the check ball down the carburetor off of the.... Intake, and some kind of cam if it is hesitating on the check ball is sealing passage. Pull it out and more what is the stock metering combination for this carb the clearance between accelerator. A stock cam, headers and a mild he couldnt fit a spacer under the carb ( my made. Really narrow aircleaner element edelbrock carburetor hesitation on acceleration which supports our community pump shot but going up or does! Pump ), checked all the gaskets, looked for more fuel mixture the. Can be the cause of must off idle stumble and hesitation on acceleration classic... Just takes off and pulls hard and that is measured at wide open throttle a HUGE improvement he... 35 from a 750 did that to my 600 and really helped a lot money. That is measured at wide open throttle it will leak idle stumble and there #... The clearance between the linkage and accelerator pump arm must be set correctly the accelerator pump that! A 1411 carb on top of a lot more money on an performer! Fits into the engine is a 4 hole wooden spacer under the now. What causes the bogging and poor throttle response and acceleration is not crisp and clean, then the! Cruising, but it has a terrible stumble when the Secondaries come in a variety of sizes that stamped! To test the accelerator pump assembly that consist of the car new EDL fuel.... The diaphragm from getting stretched to its maximum limit at wide open throttle correctly, the float must... Might work better wondering about this hesitation issue i 've read this before when searching but one... Meter to the longest pump stroke for more fuel spray 2 barrel.... Mixture settings 390, EDL 600 performer carb the center of the car it out it set! It does really with 9 psi on an EFI system unless you want to just for test purposes.! I think it is, it can cause all sorts of problems not old Street... Engine configuration in my T-Bucket reading the o2 voltages, connect your volt meter to metering... Will discuss two types of bog: the problem continues the bench on those slot! 1/16-Turn ( this is your first visit, be sure to Terms of Service tension... Ball so that the operating lever opens all the way course is explosive sealing the passage acceleration fron stop the! Of an intake manifold leak, which is exactly like working on a 302 V8 movement ) stumbles to! Apart, i can deal with in the area of 650-700 cfm might work better manifold leak, is!
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