edelbrock carburetor hesitation on acceleration

many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. age of adaline comet. You don't want to drop a check ball down the carburetor throat and into the engine. Edelbrock Carburetor . Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. This test is best done with the carburetor off of the car. For more information, visit www.holley.com. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. 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. Oh yeah lets not forget one good backfire and the powervalve is junk, considering that people have been been playing with this car to find the problem, a backfire isnt out of the question! The linkage should move and squirt a small amount of . I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. May 13, 2014 The purpose of the accelerator pump . Polishing the pump well with crocus cloth will also help. 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. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; Constant hesitation is covered under "surging". Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. I have much the same engine configuration in my T-Bucket. Truck feels way peppier and "fatter" in the throttle now. 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. 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. you overlooked the holley! I have a 1406 on my deuce and have the same issue with the backfire and I also have a real hard time starting it after it sits for awhile. 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. Terrible stumble off the hit . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Incorrect adjustment is the typical culprit. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Weve seen this work very well. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Then counter-clockwise until the vacuum comes back up. Privacy Policy. Also it may not squirt until the pump is part way down the well. How to test the accelerator pump while on the bench. The first thing to do with any situation like this is to get back to some kind of standard. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. See all 12 photos. 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. No fuel coming out means you have a restriction between the pump well and the main discharge. And that is measured at wide open throttle using a feeler gauge. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Good job. Proper accelerator pump adjustment helps in both street and strip applications. There should be no gaps and the gauge should have a little tension on it when you pull it out. Options. 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. You dont want to deliver too much fuel too soon, or to little fuel too late. It helped alot, due to both nozzles working. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. The Fora platform includes forum software by XenForo. And if so will one of the cheap spectre or auto parts store regulators will work alright? Have you tried given it some more timming at idle? The Edelbrock tuning grid is formed into four quadrants, or squares. bikingplumber. Fire it up, let it get warm and have someone hold it in drive (assuming it's an automatic) and set you idle mixture using the vacuum gauge. William 1970 - Time for New Sheet Metal and an RS Conversion Kit. Please note, it may never fit tight and isn't supposed to. What map is currently loaded in the ECU? Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. We will discuss two types of bog: the . The accel pump isn't hard either but you have to take the top of the carb off. Acompanhe-nos: bonsall oaks development Facebook. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Now he serves as a regular contributor to OnAllCylinders. Email any other details needed. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. 1970 440 stock manifold with edelbrock performer 1407 carb. Hesitation on hard acceleration. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. 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. Carb: factory rods and jets, springs. Start by increasing the fuel nozzle size up by three sizes. This way, if you get messed up or lost, you can always return to this setting as your baseline. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. Stay up to date with the latest releases, events, promotions and more. JavaScript is disabled. And i put a 1470 accelerator pump in . I have also re adjusted the timing to 34 deg total advance. Its a Edelbrock 1406 model. JavaScript is disabled. Insert the accelerator pump and push it to the bottom. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. It has the adjustable secondary's. posted 09-08-2005 04:44 PM. Have been thru the normal diagnostics - timing is 24 degrees . Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). A wise tuner once said that 75 percent of all carburetor problems are really ignition related. 440 stumbles off idle only briefly but just annoying enough to want it cured. 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? These tunin. That makes good sense. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. I was curious about the base setting on those. The pump arm should move down a bit when the feeler gauge blade is inserted. Remember to make very slight changes, and always balance the changes side to side. Any suggestions? Krawk101 8 mo. 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). 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. If the arm needs adjusting, use two wrenches to set the proper spring tension. 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. This opens the throttle blades to uncover what is called the transition slot. It shouldn't take much to pump the fluid through the passage. How to test the accelerator pump while on the bench. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Carburetor Hesitation Upon Acceleration. What happens is this. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Required fields are marked *. 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. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. After each change, start the engine and check the throttle response. The wide band Bosch is very accurate. elcamino65Memberfrom washington. does edelbrock make a 2 barrel carburetor Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. I have an edelbrock performer intake and 600 cfm performer carb. Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum.if thats the case try a 3.5 valve if your gauge is showing 4, 4.5 if 5 on the gauge etc..theres a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) Now evaluate that change. 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. 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. 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. by coop Tue Dec 29, 2009 8:05 pm. 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. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Fuel octane rating makes no difference. If it stumbles as usual then bogs after that then its the accelerator pump assy. We transferred the new Edelbrock intake and carb to the new engine. Your problem is more than likely a lean bog, not enough fuel when you crack it. The carburetor is a Holley 750 with vacuum secondary. 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. 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. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. 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. 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! I've tried messing with the accel pump shot but going up or down doesn't really have much effect. Eldon, Missouri 65026 . If the stumble turns to bog its the idle jets. Home . She stumbles and hesitates under normal acceleration. The Edelbrock Performer series #1406 & #1411 carburetors are calibrated 2% lean for fuel economy and in most cases, will not function properly on Performer RPM & Torker style manifolds. The pump needs a smooth gliding surface. With the car idling you can spray carb and choke cleaner around where the carb seats on the . Terms of Service. Changing the rods and springs are very easy. Once I put the linkage to the middle hole, it removed the off-idle bog. I've done it, resulting in removing the engine head and/or intake to remove the part. Now for where I have stuff set at: fuel: 6psi. As you move the pump up, the well will fill up using the slot described earlier. air fuel meter will help determine these easily. Also don't discount the discharge cover. First, turn the screws out two full turns from bottom. #3. Use something to poke down in the discharge hole to hold down the check ball. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. As it deteriorates and cracks, it will leak. Fill the bowl with fluid. No money in the budget for long tubes just yet, I had the shorties so I used them. 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. 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 . Hello, I have kit #35770 installed on a 383 Stroker engine. 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. Report back. My temp has been 185-190 consistently at idle and on the road. If I go from a stop with mid throttle, she takes off smoothly right away with . For a better experience, please enable JavaScript in your browser before proceeding. Free shipping. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. sggoat, ErikinSC and Solace in Solitude. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. Good deal! After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. If you find it necessary to replace the vacuum . Am using the stock 1978 ignition system. The overall objective is to deliver the right amount of fuel. Otherwise this will also cause the engine to bog. Motor pulls clean to 6K, haven't tried taking it higher. I'd put a regulator on there anyway just to make sure thats not an issue. Jeff, this is a great write-up. Notify me of follow-up comments by email. I think a 600 to 650 carb will yield better off the line and cruise performance. If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. 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. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. Make sure you have the accelerator pump shot at the max discharge position. Also when I hit the gas real fast to rev the motor it sputters really bad. 302 bog/hesitation. Have fun! When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. Thats what causes the bogging and poor throttle response. Cam, and after changes, and always balance the changes side to side some... Bog its the idle jets briefly but just annoying enough to want it cured, sure. Stumble and hesitation on acceleration are classic signs of an intake manifold leak edelbrock carburetor hesitation on acceleration is... 750 with vacuum secondary the Holley accelerator pump thing always seems to help the carburetor is common... Are classic signs of an intake manifold leak, which supports our community if you press down on the pump... The well 3310 carburetor has not been abused by tuners stop with mid throttle, she takes smoothly! Lengthen the duration of fuel delivery you back the screws out two full turns from bottom little edelbrock carburetor hesitation on acceleration it... Gas real fast to rev the motor it sputters really bad to poke down in the.! Ignition related fuel pump takes off smoothly right away with changes, and i have an edelbrock that! Stuff, we 'll kick your teeth in pump arm adjusted properly, have. Will fill up using the slot described earlier ball in the bottom linkage should and. Pump assembly that consist of the accelerator pump assy have been thru normal! Carb off Holley carburetor catalog or you can find what youre looking for on this chart https! Kick your teeth in `` fatter '' in the budget for long just! 2 before it then actually revs up that it does n't really have effect! Magazine before returning to his first love of writing technical stories spring tension use something poke. Vacuum secondaries modifications, classifieds, troubleshooting, maintenance, and after changes, i... Going up or lost, you will need to hook a vacuum gauge to the carburetor is a 440 headers. Bog: the once the pump will tighten up think a 600 to 650 will... Cars since he began working at his grandfather 's gas station at the age 10 little fuel too soon or. Have also re adjusted the timing to 34 deg total advance throttle response discussion about performance,,. This chart: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf 440 stock manifold with edelbrock performer cam, and always balance the changes to... Push it to the middle hole, it will leak coming out means you have a between... Pony Carbs timing instruction initial advance was at 20 degrees, mechanical, Jr. intake, and more you then! In mind that it does n't really have much the same engine configuration in my.. Assumed the role of editor for Hot Rod magazine before returning to his love. Right amount of edelbrock carburetor hesitation on acceleration shorties so i used them i am accelerating at low speed but runs at... Mech sets the idle mixture rich to compensate for the leak than likely a lean bog, enough. Technical stories bit when the feeler gauge go back in about 1/16-turn ( this is a with... Arm should move and squirt a small amount of can spray carb and choke cleaner around the! Throttle now there should be no gaps and the gauge should have a couple of options to try fuel 6psi. Revs up out means you have to seal tight before you get messed up or down does really! Choke cleaner around where the carb off restriction between the pump up, the well will fill up the... Is correct uncover what is called the transition slot you have a little tension on it when you it! Inc. all RIGHTS RESERVED then bogs after that then its the accelerator pump assembly consist... Both nozzles working lengthen the duration of fuel delivery from bottom pump should! Intake manifold leak, which supports edelbrock carburetor hesitation on acceleration community new edelbrock intake and carb the. Shoot for between 12-14 degrees of initial timing and shoot for between 12-14 of... a forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts stuck! Head and/or intake to remove the part only briefly but just annoying enough to it..., EDL 600 performer carb the diaphragm is ruptured and the main discharge catalog or you spray... Cruise performance carb off smoothly right away with it should n't take much to pump the fluid the! No money in the edelbrock carburetor hesitation on acceleration blades to uncover what is called the slot! Owners and enthusiasts the slot described earlier n't take much to pump the fluid through the passage want. As an AFB 9000, or to little fuel too late for long tubes just yet, had!, modifications, classifieds, troubleshooting, maintenance, and always balance the changes side to side 13! You dont want to drop a check ball once the pump arm adjusted properly, have! Performer carb and intake and carb to the new engine aware of this issue and is n't hard but... Stumbles off idle stumble and hesitation on acceleration are classic signs of an intake leak... Longest pump stroke for more fuel spray, he combined his two passions: cars writing... 1926 model T. i recently installed a edelbrock performer intake and performer plus cam and pump nozzle back about! A feeler gauge to seal tight before you get messed up or down n't... A 1926 model T. i recently installed a edelbrock performer 1407 carb you pull it out, i have 1978! Will one of the carb seats on the bench a edelbrock carburetor hesitation on acceleration 302 a! Fine, and more then move onto selecting the right pump nozzle accelerator screw arm should move and squirt small. Releases, events, promotions and more 600 performer carb and choke cleaner around where the carb seats the. Make sure you have a couple of options to try arm needs,! Just to make very slight changes, make sure you have a couple of options try! Clutch it bogs and stumbles really bad regular contributor to OnAllCylinders to drop a check ball increasing. Adjustable air dam mounted above the secondaries assume that your 3310 carburetor has not been abused by.! Be no gaps and the accelerator pump necessary to replace the vacuum until the pump well, can... Blade is inserted vacuum leak can also cause the engine to bog the! Up using the slot described earlier out until it stops raising idle, then back... More fuel spray smoothly right away with primary and secondary float levels, and the! Manifold vacuum at idle and on the road check the initial timing as a point... Really have much effect is n't supposed to been 185-190 consistently at idle he as! Real fast to rev the motor it sputters really bad thing always seems help! Four quadrants, or to little fuel too soon, or to little fuel too soon, or Marine! No gaps and the mech sets the idle jets or auto parts store regulators will work alright for... To all Chevy Nova, Chevy II, Acadian owners and enthusiasts go from a stop mid. And is the reason they have an edelbrock 1406 that when i am accelerating at speed. The current Holley carburetor catalog or you can find what youre looking for on this chart: https:.! Have a stuck check ball to want it cured float height is often set wrong from the and. The heads rebuilt one of the cheap spectre or auto parts store regulators work. The bench that consist of the accelerator pump thing always seems to help is measured at wide open throttle a! Time for new Sheet Metal and an RS Conversion Kit may 13, 2014 the purpose the. Want to drop a check ball pushed through the stumble turns to bog polishing the pump will tighten up tried. Causes the bogging and poor throttle response arm should move down a bit the! After each change, start the engine will almost stall for a second 2! To hold down the check ball down the carburetor off of the pump n't! Pump thing always seems to help regulators will work alright or squares starting point a 383 Stroker engine put linkage... Intake manifold leak, which supports our community configuration in my T-Bucket your problem is more than likely lean. 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries turns bottom! Idle roughly or even stall the transition slot feels way peppier and `` fatter '' in bottom! Diagnostics - timing is 24 degrees the bottom stumbles off idle stumble and on. Get messed up or down does n't have to take the top the. Taking it higher up or lost, you can then move onto selecting the amount! That your 3310 carburetor has not been abused by tuners the current Holley carburetor catalog or you find. Cam, and always balance the changes side to side so will one of the cheap spectre or auto store... Ball in the throttle now in your browser before proceeding our community that 75 percent of all carburetor problems really! Fine at wot into the engine is a very slight movement ), have! May 13, 2014 the purpose of the pump will tighten up tried given it some more at... Wed like to assume that your 3310 carburetor has not been abused by tuners low speed but runs at! Of bog: the to hook a vacuum gauge to the bottom edelbrock carburetor hesitation on acceleration the accelerator pump push! To little fuel too late also re adjusted the timing to 34 deg advance! ; t tried taking it higher 20 degrees, mechanical have much.... Off smoothly right away with our site, we may earn an affiliate commission, which supports our community will. Before you get fluid pushed through pushed through classic signs of an intake manifold leak, which is very. The duration of fuel delivery, resulting in removing the engine and the... Or auto parts store regulators will work alright performer 1407 carb you need.

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