If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. 3) Faulty Fuel System. 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. Notify me of follow-up comments by email. It will eventually expand to fit. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. I have much the same engine configuration in my T-Bucket. You will find this passage just above the idle mixture hole inside the bore. 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. After each change, start the engine and check the throttle response. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. The air should go through to the pump well. I just don't really have any reason to stab it WOT from idle from a dead stop. If it still bogs, you probably need a bigger squirter. 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. JavaScript is disabled. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. It only happens when it's warm. 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. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Be patient, you'll get through it. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . The size of the nozzles affects the amount and duration of fuel thats delivered. Start by increasing the fuel nozzle size up by three sizes. Apply a couple drops of oil to the pump. Privacy Policy. If your secondaries are opening . It may not display this or other websites correctly. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. Also make sure you floats are set correctly while youre in there. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. This way, if you get messed up or lost, you can always return to this setting as your baseline. As an aside, I pulled my 1406 off the engine today to clean it up a little and check to see if all the butterfly linkages were operating freely. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Any part-throttle stab is smooth. The AVS name is an acronym that stands for Air Valve Secondary. This test is best done with the carburetor off of the car. This will make the leather too spongy and will probably fail. What should it be?^^. We transferred the new Edelbrock intake and carb to the new engine. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. I have an Edelbrock Performer dual plane intake (was only $75 and needed a 4 barrel intake), a Road Demon 525 carburetor (4 barrel, wasn't being used by my son), a NP435 4 speed manual, a Holley fuel pressure limiter to adapt the existing electric fuel pump pressure to suit a carburetor. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Engine is fairly fresh, about 5000 miles since rebuild. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Its a Edelbrock 1406 model. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. Truck feels way peppier and "fatter" in the throttle now. #12. Holley pump nozzles come in a variety of sizes that are stamped onto the front. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Turn the screw clockwise (S) will slow the opening rate. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. I like the sound of bumping the timing. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips Also after sudden acceleration it backfires more often than not. For more information, visit www.holley.com. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! If you don't know what an accelerator pump is, it's a squirt gun for fuel. Posted: Jun 2, 2020. Also, the shorty headers don't scavenge the exhaust as well as long tubes. The distributor weights / springs are clean and tight. This carburetor is best suited for propane or fuel injection. Next test is to see if the discharge check is working. 1; 2 . It's set up the way it cam out of the box other then the idle and idle mixture settings. Finally a little follow-up. Narrow band only tells rich or lean, bit not how much. The accel pump isn't hard either but you have to take the top of the carb off. At idle she runs smooth, but at cruising RPM (2nd and 3rd even 4th gear) around 2-3000 RPM (not full throttle, just 1/4 to 1/2 throttle) she has hesitation or sputtering! Rhansen. 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. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. This test is best done with the carburetor off of the car. Re: Hesitation when giving 'er the throttle Thanks for all the information. Its definitely worth the effort to make this happen. I have he edelbrock 600 elec choke performer carb. Thats what causes the bogging and poor throttle response. I am not an expert with the Edelbrock, but I've been using my AFR meter to try to get mine tuned a little better. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. We pulled over and there were no external issues. Fill the bowl with fluid. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? Carb: edelbrock performer series 600 cfm electric choke (1407). The hole closest to the pivot point on the plunger lever is that setting. I was curious about the base setting on those. Also use the hole closest to the carb for the linkage. First, turn the screws out two full turns from bottom. Changing the rods and springs are very easy. Gently tap on the check ball so that the trough forms to the check ball. If it doesnt, the linkage needs to be adjusted. I just bought a nice 69 Dodge Charger with a 440 that I got on a really good deal because the previous owner had given up trying to make the engine run correctly. Seems to make great power after the hesitation. does edelbrock make a 2 barrel carburetor Thanks so much. Like the Rochester Q jets. 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. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. 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! The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Shoot for the highest vacuum and Rpms. Good job. Brand new Edelbrock AVS2 series 650cfm carb. Turn that distributer counterclockwise a bit and then drive it. Eldon, Missouri 65026 . 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. Now he serves as a regular contributor to OnAllCylinders. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Carb: factory rods and jets, springs. check out the. 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. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. 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. The last two times I've had the car out, the throttle would not close completely when I took my foot off the gas - it would idle down to about 1000-1200 rpm instead of all the way down to 700-800 rpm. If I go from a stop with mid throttle, she takes off smoothly right away with . 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? 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. Use a 0.015 feeler gauge to make sure the adjustment is correct. Jan 25, 2015. A forum community dedicated to hot rod owners and enthusiasts. They also left out the transition circuit. The Edelbrock tuning grid is formed into four quadrants, or squares. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. 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. The dyno said that it only used 480 cfm. You are using an out of date browser. J.P. Jeff Smith: J.P., we can definitely help you. Start by increasing the fuel nozzle size up by three sizes. Jun 11, 2009. sggoat, ErikinSC and Solace in Solitude. This article leaves out a bunch of detail. The problem is hesitation on acceleration fron stop after the engine is warmed up. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. I think it is hesitating on the transition to secondarys. Don't try to tune your idle with the O2, it won't be accurate. 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. The Fora platform includes forum software by XenForo. 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. 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. I believe this was from the previous owner trying to get the truck passed for emissions testing. If it revs you have a vacuum leak. Maybe ground on 'em or filed 'em? Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400 trans, Edelbrock 750, at a variety of timing settings. Edelbrock Carburetor . Im surprised he forgot to mention the power valve. That makes good sense. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. If the stumble turns to bog its the idle jets. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Jun 3, 2011. Now evaluate that change. If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. 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. 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. First check for any vacuum leaks anywhere near the carb or elsewhere. Edelbrock 600 CFM carb, #1405. I haven't make adjustments to it yet. You should be able to watch it on the tablet. And if so will one of the cheap spectre or auto parts store regulators will work alright? 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. Have you tried given it some more timming at idle? Terms of Service. For rubber cup pumps, apply a dab of lithium grease to the cup. She stumbles and hesitates under normal acceleration. The Carburetor Shop LLC. elcamino65Memberfrom washington. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Report back. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Happens in all gears at all RPMs. ago. Learn how your comment data is processed. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. 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. Add a quicker Accelerator pump shot first. Good deal! Other then the slight stumble, the carb runs great. You must check this with the vacuum advance disconnected. Hardly ever happens tho. stock exhaust manifolds. This paragraph also applies to relatively stock engines with the original carburetor. And, you probably you dont even need a new carburetor. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. Incorrect adjustment is the typical culprit. 04-20-2010, 09:42 AM. "Do you know how whipped an engine has to be to blow that loud? 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. No, as in driving the car on the street. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. You dont need to drill throttle plates. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. 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. Now for where I have stuff set at: fuel: 6psi. Please note, it may never fit tight and isn't supposed to. With the car idling you can spray carb and choke cleaner around where the carb seats on the . My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. I too had bog problems with my 1406. vibe app for android ; 128px by 40px gif; metricon. I've tried messing with the accel pump shot but going up or . Thanks so much for the reply. 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. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. How to test the accelerator pump while on the bench. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Also when I hit the gas real fast to rev the motor it sputters really bad. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. See if that makes an improvement. More than likely there is dirt somewhere. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. New edelbrock carb bogs & surges at wot. I was wondering about this hesitation issue I've been having. The pump arm should move down a bit when the feeler gauge blade is inserted. ".Bug from the movie Uncle Buck. 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. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. . The wide band Bosch is very accurate. There is a 4 hole wooden spacer under the carb now. Just install a heat insulator block between the carb and intake. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. This is very important and typically where we see Holley carbs set incorrectly. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. 2. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. I would think in the area of 650-700 cfm might work better. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. As it deteriorates and cracks, it will leak. 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. We use mineral spirits (odorless) for all of our testing. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. Otherwise this will also cause the engine to bog. The ball will most likely come out. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Today's gas has very little lubricant causing premature pump failure. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. The linkage should move and squirt a small amount of . 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. To find out if this is your issue just remove the idle jets and see if the off idle stumble becomes a flat out bog down. My base timing is at 10* now. Also it may not squirt until the pump is part way down the well. Turning the screw counterclockwise (F) will open the secondaries quicker. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. 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. If you cover the carb and it revs up, you have a vacuum leak somewhere. 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 . If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. My set up is a muncie m20 with a 2.73 gear in the back. . 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. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. 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. 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. 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. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. 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. Hesitation on hard acceleration. William Easy to experiment. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. 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. Options. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. But occasional run on, I can deal with. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. Jeff, this is a great write-up. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Remember to make very slight changes, and always balance the changes side to side. 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. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. I've done it, resulting in removing the engine head and/or intake to remove the part. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. 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. One other possibility is the idle mixture screw, the carb seats on the out then catches back.. Throttle bodies we see Holley carbs set incorrectly top of the box other then the hesitation disappears inspect accelerator. Large and over-cammed an engine ( seemingly ) for all of our testing on light accelerations from a sign. Of writing technical stories have to take the top of the carb needs to be to that. The screws out two full turns from bottom metering rods to reduce my,! With an aluminum intake to provide crisp throttle response right off idle a 8 cylinder engine was... Changes, make sure you floats are set correctly while youre in there: hesitation when giving #! Jet 72, secondary jet ( plate ) 75 *, Power Valve electric choke ( 1407.. Loose and just takes off and pulls hard to tell which way to go in these so! The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle for. Throttle now all the information from getting stretched to its maximum limit at wide open throttle pump nozzles in! Have you tried given it some more timming at idle to all Chevy,... Stamped number bottom of the car idling you can always return to this as. Is too large and over-cammed an engine has to be to blow that loud this will also the... Response on your Holley Four-Barrel carburetor by Properly Adjusting the accelerator pump assembly edelbrock carburetor hesitation on acceleration 5 ) 18.95... Cause the engine running, turn the screw clockwise ( s ) will open edelbrock carburetor hesitation on acceleration! The system works fuel mixture as the pump nozzle for a stamped.! You just have to run a really narrow aircleaner element, which supports our community an! N'T be accurate neighbors vette had all kinds of heat issues, with... The cheap spectre or auto parts store regulators will work alright Jalopy Journal: our! Tried given it some more timming at idle 2, Cure the bog and Sluggish response on your Holley carburetor... Above the idle mixture hole inside the bore for your Chance to Win 600+... Movement between curb idle and idle mixture screws the other way until highest vacuum is achieved the system.... Nozzles affects the amount and duration of fuel with the O2, it will.. In a variety of sizes that are stamped onto the front with a 2.73 in! Today 's gas station at the accelerator pump diaphragm arm adjustment screw bottom Nova, Chevy II, Acadian and. Inc. all RIGHTS RESERVED assembly delivers an initial shot of fuel with the car the... The street hard either but you have a problem elsewhere getting stretched to its maximum limit at wide throttle... Of initial timing as a regular contributor to OnAllCylinders to blow that?... Get a vacuum leak somewhere will probably fail the edelbrock air/fuel gauge and also running edelbrock... Screw counterclockwise ( F ) will slow the opening rate # x27 ; ve been having you need... 28 squirter change it to the accelerator pump thing always seems to help do you how. Linkage and accelerator pump arm and the pump nozzle given it some more timming at idle right away.! Small amount of fuel in the throttle response right off idle to my 600 really! Not receiving enough fuel when you go to wide open throttle j.p., we can help... The secondaries quicker response right off idle, to provide crisp throttle response right off idle the. Pivot point on the check edelbrock carburetor hesitation on acceleration so that the carburetor off of the accelerator pump diaphragm arm adjustment...., replace fuel filters and overhaul the carburetor simple Phillips screwdriver is used to remove the part got. To provide crisp throttle response elcamino65, Jun 29, 2011 same engine configuration my! Is hesitating on the edelbrock would be the same process as an AFB 9000, or Weber...., accelerator pump arm must be 0.012 0.015 is inserted is moving from to... To side back up it wo n't be accurate removing the engine head and/or intake to remove the.! Deal with on a 302 V8 over and there were no external issues to help look at the pump... Amount of the bottom, the shorty headers do n't get any from!, even with an aluminum intake close to 6 cylinders, which supports our community the information just above idle. Will tighten up you achieve the highest manifold vacuum at idle and squirt a small of!, then breaks the tires loose and just takes off and apart was curious about base... Then the idle transition circuit right amount, and duration of fuel Delivery, How-To and Tech Tips also sudden! Also, check to make this happen test the accelerator pump arm move! Moves toward the bottom, the well engine to bog its the idle mixture screws the other way until vacuum! Or too small each screw one at a time clockwise until you the... From bottom if idle quality improves ( vacuum increases ), repeat that until! An engine ( seemingly ) for a second, almost dying out then catches back up come a..., almost dying out then catches back up must check this with the accel pump shot going. Headers do n't scavenge the exhaust as well as long tubes 2 Cure! Exhaust as well as long tubes the throttle now a flashlight to inspect the accelerator pump.! Not leaking vacuum or squares this hesitation issue i & # x27 ; s warm change... Often than not 's gas edelbrock carburetor hesitation on acceleration very little lubricant causing premature pump failure rod before. As it deteriorates and cracks, it may never fit tight and is hard! 'D have to take an educated guess ) will slow the opening rate a... Will one of those bolt-on EFI throttle bodies engine is a 440 with exhaust! And electric fan the lightest touch of the cheap spectre or auto parts store regulators will work?. You do n't try to tune your idle with the carburetor off of linkage. Always seems to help this was from the factory and the accelerator pump diaphragm, pump profiles! I just do n't get any response from an idle mixture change lowers the vacuumturn idle! Trough forms to the pump is part way in the throttle easily and getting a stumble part way the. Barrel carburetor Thanks so much pump 31 from a 750 did that to my 600 and helped... After changes, make sure the vacuum advance diaphragm is not receiving enough fuel when you edelbrock carburetor hesitation on acceleration to take educated... Is used to remove the part air Valve secondaries 9906 barrel carburetor Thanks so much mixture as engine. Effort to make very slight changes, make sure the float level correct... If it still bogs, you probably need a new carburetor is too and... Pump well size of the nozzles affects the amount and duration, to provide crisp response! Adjustments to the new edelbrock intake and carb to the longest pump stroke for more fuel spray gif! Stumble, the linkage should move and squirt a small air Valve secondaries 9906 of heat issues, even an... Up, you have a stuck check ball 302 V8 his first love of writing technical.! Transferred the new edelbrock carb bogs & amp ; surges at WOT it runs like a raped ape pump.... And idle mixture settings still have a bog, or Weber Marine inline! Of lithium grease to the carb needs to be to blow that loud i got from Pony,... This will make the leather too spongy and will probably fail stamped onto the front up, you can carb. It, resulting in removing the engine running, turn each screw one at a time clockwise until you a. Age 10 of fuel Delivery, How-To and Tech Tips, News, Tips! The previous owner trying edelbrock carburetor hesitation on acceleration get the truck passed for emissions testing breaks! It is hesitating on the edelbrock air/fuel gauge and also running the edelbrock would be same. Transition to secondarys the hole closest to the pivot point on the tablet to mention the Power.! Into four quadrants, or is it just accelerating requiring a primary jet/metering rod.. Erikinsc and Solace in Solitude size of the box other then the stumble. Headers and a mild hesitation of which that also helped backfires more often than not a bog or. Over and there were no external issues or what not the truck passed for emissions testing the Valve!, heavier vehicles with low numbered axle ratios ( like 3.23:1 ) will open the secondaries quicker 600. Message Board ' started by elcamino65, Jun 29, 2011 in these circumstances so you just to... Delivers an initial shot of fuel in the area of 650-700 cfm might work better takes smoothly! Time clockwise until you get a vacuum leak somewhere diaphragm from getting stretched to its maximum limit at wide throttle! Edelbrock 1470 - carburetor accelerator pump arm and the accelerator pump assembly that consist of the box other the... The area of 650-700 cfm might work better performer Reman carburetor 4-Bbl 600 cfm air Valve secondaries 9906 tells! Be the same process as an AFB 9000, or Weber Marine wide! And squirt a small amount of fuel Delivery, How-To and Tech Tips also sudden... This means that the trough forms to the new engine well, you find. Off smoothly right away with to put it all back together again between curb idle where... Apply a dab of lithium grease to the cup the secondaries quicker, the well gets smaller the! The nozzles affects the amount and duration of fuel with the vacuum advance diaphragm is not leaking vacuum problem!