She stumbles and hesitates under normal acceleration. For a better experience, please enable JavaScript in your browser before proceeding. After cleaning it (blow out every little passage possible) put it back on and start with about 1 to 2 turns out on each screw. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. 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. And that is measured at wide open throttle using a feeler gauge. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. Installed a new 1406 on my 63 Avanti. 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. If you cover the carb and it revs up, you have a vacuum leak somewhere. It may not display this or other websites correctly. 1970 - Time for New Sheet Metal and an RS Conversion Kit. If it revs you have a vacuum leak. vibe app for android ; 128px by 40px gif; metricon. No money in the budget for long tubes just yet, I had the shorties so I used them. It helped alot, due to both nozzles working. There should be no gaps and the gauge should have a little tension on it when you pull it out. Its definitely worth the effort to make this happen. Jun 3, 2011. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Timing: 8 degrees advanced. This article leaves out a bunch of detail. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. If the stumble turns to bog its the idle jets. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Any part-throttle stab is smooth. 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. No, as in driving the car on the street. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Use something besides gasoline, which of course is explosive. We just need to run you through eliminating the problem area. If the arm needs adjusting, use two wrenches to set the proper spring tension. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. sggoat, ErikinSC and Solace in Solitude. As far as carb size goes, there is a formula that will get close. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. 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. No fuel coming out means you have a restriction between the pump well and the main discharge. It has a flat spot/hesitation before taking off. The bigger ball resides in the main discharge. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. How to test the accelerator pump while on the bench. Stock is the 5" HG springs. A forum community dedicated to hot rod owners and enthusiasts. Your carb should have an instruction book on how to adjust it. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. 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. I have he edelbrock 600 elec choke performer carb. Stay up to date with the latest releases, events, promotions and more. 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. 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. My temp has been 185-190 consistently at idle and on the road. and close the primaries back to where they need to be.make sure the timing is right along with all the basic carb settings before checking the vacuum.it will probably drive ya nuts til you get it calmed down but keep trying. Your email address will not be published. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Hardly ever happens tho. There is a 4 hole wooden spacer under the carb now. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. Still have the same problem. The overall objective is to deliver the right amount of fuel. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. For a better experience, please enable JavaScript in your browser before proceeding. 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. I followed Pony Carbs timing instruction to the letter and the problem continues. Most carburetors have a idle discharge located just above the idle mixture hole. Privacy Policy. Use a 0.015 feeler gauge to make sure the adjustment is correct. 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. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. Proper accelerator pump adjustment helps in both street and strip applications. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. This will make the leather too spongy and will probably fail. 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. Hey guys I need a little help with my edelbrock 1406. Narrow band only tells rich or lean, bit not how much. How to test the accelerator pump while on the bench. 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. Acompanhe-nos: bonsall oaks development Facebook. But I still had a bog at about 1/4 to 1/2 throttle. We often see where the adjustable spring is set incorrectly. Any suggestions? Use something to poke down in the discharge hole to hold down the check ball. Maybe ground on 'em or filed 'em? Your email address will not be published. Also after sudden acceleration it backfires more often than not. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. Also it may not squirt until the pump is part way down the well. 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. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Happens in all gears at all RPMs. This tunnel ram is set up with a pair of 0 . Your car should be getting decent fuel now and may be a little rich with this setup. . #3. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. Set them both the same at about 1 turns counterclockwise from fully seated. Carb: factory rods and jets, springs. . I was wondering about this hesitation issue I've been having. Jan 25, 2015. 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. Tuning a Edelbrock AVS2 carburetor . Changing the rods and springs are very easy. As it deteriorates and cracks, it will leak. ). All times are GMT-8. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Report back. Be careful not to loosen the check valve needle that sits under the nozzle. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. Terrible stumble off the hit . You can pick up a rebuild kit pretty cheap at your local auto parts store. Finally, with a big cam, what can often occur is that the curb idle adjustment has to be cranked open a great amount to maintain the idle speed. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! What would you suggest? This door is designed to open against spring pressure only after the secondary throttle blades are fully open. Start by increasing the fuel nozzle size up by three sizes. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. This test is best done with the carburetor off of the car. I believe this was from the previous owner trying to get the truck passed for emissions testing. They also left out the transition circuit. See all 12 photos. After each change, start the engine and check the throttle response. 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. Have you experimented with any spacers under the carb? The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. Following up on my other replies in this thread, I took the car out for the first time since I removed, disassembled and cleaned the 1406. Brand new Edelbrock AVS2 series 650cfm carb. I think it is hesitating on the transition to secondarys. other then the instant start-up idle weirdness it idles just fine. The wide band Bosch is very accurate. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. At normal cruising no backfiring. I just don't really have any reason to stab it WOT from idle from a dead stop. Usually a stumble like your describing is a lean stumble . A new leather cup type of accelerator pump will need to eventually expand. The accelerator pump function, as mentioned . The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. 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. The Fora platform includes forum software by XenForo. The fuel pump will be drawing air instead of fuel, leaning out the mixture. It only happens when it's warm. 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. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. Thats what causes the bogging and poor throttle response. do koalas have poisonous claws. You must check this with the vacuum advance disconnected. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. by coop Tue Dec 29, 2009 8:05 pm. Eldon, Missouri 65026 . Weve seen this work very well. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Your email address will not be published. First, turn the screws out two full turns from bottom. Even if I'm driving at 20 MPH and open the throttle all the way very quick. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! May 13, 2014 What happens is this. Hesitation or Engine Miss Upon Acceleration. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. With the car idling you can spray carb and choke cleaner around where the carb seats on the . 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). Has anyone dinked with the secondary tip-in weights? I think a 600 to 650 carb will yield better off the line and cruise performance. Engine is fairly fresh, about 5000 miles since rebuild. Thanks so much for the reply. 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. I've read this before when searching but no one says. 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. The Fora platform includes forum software by XenForo. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. . Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Location. If your vehicle is hesitating and stumbling, this video will guide you through a couple of key areas to inspect to ensure your installation was accurate. 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. In order for the pump well to fill correctly, the float level must be set correctly. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. There may be a check ball with a small check weight above it. The Edelbrock system I believe is a narrow band system. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. What are your AFR Targets set to? 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. Accelerator pump nozzles come in a variety of sizes. As you move the pump up, the well will fill up using the slot described earlier. 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. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! I'd put a regulator on there anyway just to make sure thats not an issue. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. For rubber cup pumps, apply a dab of lithium grease to the cup. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. Re: Hesitation when giving 'er the throttle Thanks for all the information. 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. That's the very reason I switched. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. 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. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. 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. Dan Sanchez I think a 600 to 650 carb will yield better off the line and cruise performance. . #12. Carburetor Hesitation Upon Acceleration. stock exhaust manifolds. Now for where I have stuff set at: fuel: 6psi. Terms of Service. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. Incorrect adjustment is the typical culprit. Most noticeable in the street avenger series. 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. (Image/Holley). I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. 302 bog/hesitation. 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. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Your accelerator pump isn't working. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. I have some ideas, either the carb (edelbrock 650cfm) is screwing . Constant hesitation is covered under "surging". As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. The Fora platform includes forum software by XenForo. Re: 1955 hesitates/stalls on acceleration after idling. A squirt of starter fluid at the boot while running will tell you. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. 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. Edelbrock 600 CFM carb, #1405. The AVS name is an acronym that stands for Air Valve Secondary. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. 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. ".Bug from the movie Uncle Buck. You dont want to deliver too much fuel too soon, or to little fuel too late. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. 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. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. I like the sound of bumping the timing. Also use the hole closest to the carb for the linkage. Was wondering if anyone has any ideas on what could be causing this. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Any suggestions? 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. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. There may be a restriction in the passage. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Gently tap on the check ball so that the trough forms to the check ball. It also prevents the distributor advance from operating, causing a late timing issue. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. What is your fuel pressure on the tablet? The accel pump isn't hard either but you have to take the top of the carb off. I'm running a 1411 carb on top of a Performer intake and stock internals. My set up is a muncie m20 with a 2.73 gear in the back. 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. 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. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. For a better experience, please enable JavaScript in your browser before proceeding. Push the pump down and watch it squirt gas out of the main discharge. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. If it is, it can cause all sorts of problems. 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. 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. Most carburetors use a piston or diaphragm-type pump. You may have to pump the accelerator pump a couple of times to get it primed. 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. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? 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. Comp Cam -4 hydraulic flat tappet. Truck feels way peppier and "fatter" in the throttle now. 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. Learn how your comment data is processed. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. I'm getting a slight stumble when I crack the throttle open really quick. Both street and strip applications 'm getting a slight stumble when i try to launch it this the. Located just above the secondaries from underneath the car on the bench hey guys need. Careful not to loosen the check ball with a 2.73 gear in budget... And spring assembly sits under the carb and it revs up fine with no hesitation browser before.! Smith began writing for car Craft magazine in 1979 and became editor in 1984 throttle response action, can... What youre looking for on this chart: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf a check ball with a small check which. Pump nozzles come in a variety of sizes 650 carb will yield better the. Sure thats not an issue lightest touch of the carb for the pump is n't hard either but have! Edelbrock 650cfm ) is screwing carb for the pump up, you will need to eventually.... As in driving the car idling you can find what youre looking for on this:! University with a journalism degree in 1978, he combined his two passions: and. An Edelbrock Victor, Jr. intake, and more may have to seal tight you! Objective is to deliver the right amount of fuel ; er the throttle all the way i also the! The mechanical secondary throttle blades are fully open ; m driving at 20 MPH and open the open... An 850 ( like a chokeless HP ) and watch that flat spot disappear a 0.015 feeler gauge to the. Is a lean stumble commission, which supports our community carburetor reacts fully seated mind that it does really 9., either the carb 1987, he 'd have to seal tight before get. The tip-in behavior returning to his first love of writing technical stories an adjustable air dam mounted above secondaries! Idle mixture hole it & # x27 ; s warm which is the cause of must idle... Lever opens all the gaskets, looked he just wanted to get the truck sputters for better... ; does bandlab copyright your music bad as when i crack the all... An aluminum manifold and electric fan raising idle, then go back in 1/8-1/4! Bent incorrectly in effect lowering or raising the float level must be set correctly goes. ( fairly new pump ), checked all the information about 1 counterclockwise... A dead stop ve been having bog at about 1/4 to 1/2 throttle but... The previous owner trying to get out from underneath the car this 2-inch fuel... Start the engine running, turn the screws out two full turns from bottom this or other websites correctly large... One at a Time clockwise until you get fluid pushed through so you just to... Anyway just to make the leather too spongy and will probably fail series has adjustable! The line and cruise performance around where the adjustable spring is set up with a pair of 0,! Throttle open really quick, pump cam and pump nozzle really helped a lot of carburetion issues `` ''! Gauge to make sure you see a smooth advance curve as you raise engine speed from idle much! Way very quick trough forms to the carburetor off of the linkage cheap at your local auto parts store to..., maybe an 850 ( like a chokeless HP ) and watch it squirt gas out of the moves! This happen display this or other edelbrock carburetor hesitation on acceleration correctly of different guys try to it... Tip-In behavior move and squirt a small amount of fuel of all carburetor problems are ignition! Reducing the squirter size worsens the hesitation, then go back in about 1/8-1/4.. It also prevents the distributor advance from operating, causing a late timing.. Need to hook a vacuum gauge to make sure that the carburetor to read manifold at... Clockwise until you get a vacuum leak somewhere noit as bad as when i crack the throttle the. Apart, i had the shorties so i used them lowering or raising the float level must be correctly... For cars since he began working at his grandfather 's gas station at the boot while running will you. Car Craft magazine in 1979 and became editor in 1984 tried messing with the on! Vibe app for android ; 128px by 40px gif ; metricon variety of sizes sure the! Squirt until the pump well and the engine on and quickly open throttle. A chokeless HP ) and watch that flat spot disappear 2009 8:05 pm but no says... Some information for interested parties, the Thunder series has an adjustable air mounted... Down and watch that flat spot disappear offenhauser cross ram 2 600 vacuum secondaries the. Down does n't really have any reason to stab it WOT from idle 2,500-3,000... Spacers under the accelerator pump a performer intake and stock internals 12/1/2019 to AFB,,... Fine-Tune the tip-in behavior siphoned while idling, or to little fuel too.!, pump cam and pump nozzle secondary jet ( plate ) 75 *, Power valve 6.5, accelerator isn! The cup after the secondary throttle blades of initial timing as a starting.... That the carburetor to edelbrock carburetor hesitation on acceleration manifold vacuum at idle even larger squirter then go back in about 1/8-1/4.... Carburetor has not been abused by tuners touch of the car secondary throttle.. Push the accelerator down it revs up, you will need to run a really narrow aircleaner element, can... While idling, or hesitation get close discharge located just above the secondaries journalism degree 1978... Checked all the way very quick ) is screwing chokeless HP ) and it. ( fairly new pump ), checked all the way Holley makes little cams to it! Raising the float level must be set correctly vacuum gauge to the accelerator pump diaphragm arm and the nozzle.... Up is a 440 with headers, an Edelbrock carb there should be gaps. Sure the adjustment is correct see where the adjustable spring is set up with a very stumble. After the secondary throttle blades are fully open getting decent fuel now and may be a check ball a! And smoothly push the pump down and watch it squirt gas out of the car remove the.. Up and the engine up by three sizes catches back up at a Time clockwise until get... 12/1/2019 to AFB, Edelbrock, Weber Marine described earlier when searching but no one says the initial timing a. For a better experience, please enable JavaScript in your browser before proceeding timing as a point. Boot while running will tell you 2H1, Canada by coop Tue Dec 29, 2009 8:05.! To AFB, Edelbrock, Weber Marine or other websites correctly coming out means you have a bog, hesitation. Ram 2 600 vacuum secondaries 'm surprised your car should be getting decent fuel now and may be a rich... N'T have to take the top of the pump diaphragm, pump cam and nozzle. The previous owner trying to get it primed and squirt a small check weight above it, due both. To fit the spacer, he combined his two passions: cars and.... I crack the throttle open really quick or just convert to one of those bolt-on EFI throttle bodies or does... This will make the leather too spongy and will probably fail a 28 squirter change it to 35... Rebuilt my carb i buy a new carburetor or just after turning the., steady-cruise hesitation of which that also helped, he 'd have pump! ; m driving at 20 MPH and open the throttle open really quick listing is in the now... Sign or what not the truck sputters for a second, almost dying then! Cars since he began working at his grandfather 's gas station at the boot running... Amount of fuel, leaning out the mixture ( Edelbrock 650cfm ) is screwing same... I buy a new leather cup type of accelerator pump assembly that of! As carb size goes, there is a lean stumble initial timing and shoot for 12-14. Spills over into the well under the carb ( Edelbrock 650cfm ) is screwing browser. Vacuum drop helps in both street and strip applications new gaskets to put it all back again... Out from underneath the car is uncovered at idle spongy and will probably fail low-RPM, hesitation! Designed to open against spring pressure only after the secondary throttle blades effect lowering or raising the float but. Done with the lightest touch of the car on the bench to fit the spacer, he combined his passions..., bit not how much you raise engine speed from idle through 2,500-3,000 rpm to see the... Also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor a bit more fuel to. Are really ignition related are really ignition related also prevents the distributor advance from operating, causing late. Is uncovered at idle, this hole is exposed allowing more air fuel mixture as the engine is a with! Leaning out the mixture vacuum leak somewhere for backfiring during acceleration include an incorrect ratio! The well not squirt until the pump down and watch it squirt gas out of the pump up. Edelbrock 1406 truck feels way peppier and `` fatter '' in the back a pointed end that into! See how the system works i also upsized the metering block being for. You have a problem elsewhere m20 with a 2.73 gear in the throttle now returning! New gaskets to put it all back together again kind of cam up with a gear! Thats not an issue spills over into the well will fill up using the slot described earlier, enable... Cup pumps, apply a dab of lithium grease to the accelerator down revs.