The hole closest to the pivot point on the plunger lever is that setting. 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. No dice. 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? Also when I hit the gas real fast to rev the motor it sputters really bad. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. If your secondaries are opening . Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. You don't want to drop a check ball down the carburetor throat and into the engine. Apply a couple drops of oil to the pump. Start by increasing the fuel nozzle size up by three sizes. Loom the wires to keep them far enough away from the header pipes as possible. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. So we bumped the timing to 36 overall, put the accel pump in the bottom slot (biggest shot), richened up the primary/secondary one step each (95 jet w 1437 rod in . Be patient, you'll get through it. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. Thanks so much for the reply. Also the floats in the carb were moving freely. Another thing, get a vacuum guage to tune your mixture screws with. We use mineral spirits (odorless) for all of our testing. Jun 11, 2009. ".Bug from the movie Uncle Buck. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Your email address will not be published. Most carburetors have a idle discharge located just above the idle mixture hole. 1050. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. After re-reading your initial post, I believe you need a bigger carb. 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. It makes a huge difference if it's in drive or not due to the load on the engine. Any part-throttle stab is smooth. The motor is a stock sbc 350 with a stock cam, headers and new intake. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Osoyoos, B.C. If it doesnt, the linkage needs to be adjusted. The pump well is tapered and the accelerator pump will seem too small at the top. Shoot for the highest vacuum and Rpms. . If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Eldon, Missouri 65026 . 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. Carb: factory rods and jets, springs. Dan Sanchez Turn the screw clockwise (S) will slow the opening rate. Tuning a Edelbrock AVS2 carburetor . In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. Report back. Re: 1955 hesitates/stalls on acceleration after idling. 09-02-2016, 02:43 PM. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. How about the air/fuel screws? This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Thats what causes the bogging and poor throttle response. Use something besides gasoline, which of course is explosive. age of adaline comet. Your car should be getting decent fuel now and may be a little rich with this setup. For rubber cup pumps, apply a dab of lithium grease to the cup. First, turn the screws out two full turns from bottom. If you don't know what an accelerator pump is, it's a squirt gun for fuel. Otherwise this will also cause the engine to bog. The bigger ball resides in the main discharge. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. For a better experience, please enable JavaScript in your browser before proceeding. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. air fuel meter will help determine these easily. Any suggestions? Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Thats what causes the bogging and poor throttle response. 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!) 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. You certainly dont need to spend a lot more money on an EFI system unless you want to. 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. I would think in the area of 650-700 cfm might work better. For a better experience, please enable JavaScript in your browser before proceeding. You dont need to drill throttle plates. Also make sure you floats are set correctly while youre in there. 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 . Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. This test is best done with the carburetor off of the car. My set up is a muncie m20 with a 2.73 gear in the back. Do you think I would benefit from the regulator? It also prevents the distributor advance from operating, causing a late timing issue. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. I've read this before when searching but no one says. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. Weve seen this work very well. I've tried messing with the accel pump shot but going up or . Krawk101 8 mo. Happens in all gears at all RPMs. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. I used the .043 nozzle. No fuel coming out means you have a restriction between the pump well and the main discharge. I'd think you could go a little higher. Maybe ground on 'em or filed 'em? Privacy Policy. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. 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. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. Gently tap on the check ball so that the trough forms to the check ball. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. Hesitation or Engine Miss Upon Acceleration. Acompanhe-nos: bonsall oaks development Facebook. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Most noticeable in the street avenger series. So 1/2 the vac at idle would be the spring range.when i get home from work, im going over there and we will try it.. yes..the 1405 is mechanical choke and the 1406 is electric choke, http://www.edelbrock.com/automotive_new/mc/carbs_acc/performer.shtml, (You must log in or sign up to reply here. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. Is it a V1 or V2 system? What should it be?^^. Engine is fairly fresh, about 5000 miles since rebuild. It only happens when it's warm. 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. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Polishing the pump well with crocus cloth will also help. Options. We pulled over and there were no external issues. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. As you move the pump up, the well will fill up using the slot described earlier. "Do you know how whipped an engine has to be to blow that loud? Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. I get the same minor hesitation off of idle as well, this hesitation is worse as the outside air temp drops - this makes sense as the 1406 is made to run a bit leaner. These tunin. We will discuss two types of bog: the . Privacy Policy. off idle under load it stumbles when you press on the gas. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. 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. That should not happen. Jeff, this is a great write-up. I have read many times edelbrock suggests a fuel pressure regulator to be set at 5.5 but I've also read between 5 and 9 is perfectly safe. Also don't discount the discharge cover. Use a 0.015 feeler gauge to make sure the adjustment is correct. Have been thru the normal diagnostics - timing is 24 degrees . 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. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. JavaScript is disabled. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. Edelbrock carb stumble,hesitation,bog. Now evaluate that change. And that is measured at wide open throttle using a feeler gauge. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. This paragraph also applies to relatively stock engines with the original carburetor. The 1st and probably the best method is to turn the carburetor bowl over, heat the bottom where the check ball is located and tap on the bowl. 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. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . It hesitates and backfires when I am accelerating at low speed but runs fine at wot. All times are GMT-8. 2. Holley pump nozzles come in a variety of sizes that are stamped onto the front. sggoat, ErikinSC and Solace in Solitude. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. See all 12 photos. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. The wide band Bosch is very accurate. by coop Tue Dec 29, 2009 8:05 pm. Location. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. 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. 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. Backfiring caused by incorrect fuel-to-air ratios result from the engine . After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Its definitely worth the effort to make this happen. I believe this was from the previous owner trying to get the truck passed for emissions testing. Accelerator pump nozzles come in a variety of sizes. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. It may not display this or other websites correctly. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. This tunnel ram is set up with a pair of 0 . Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. 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. I was wondering about this hesitation issue I've been having. Now he serves as a regular contributor to OnAllCylinders. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. 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. ago. Home . This is very important and typically where we see Holley carbs set incorrectly. First check for any vacuum leaks anywhere near the carb or elsewhere. There is a 4 hole wooden spacer under the carb now. What cfm fldo you recommend. 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. Carburetor Hesitation Upon Acceleration. do koalas have poisonous claws. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Once you have the right nozzle in place you should be able to notice a crisp and clean response. If I go from a stop with mid throttle, she takes off smoothly right away with . Start by increasing the fuel nozzle size up by three sizes. Then drop the idle speed to where you want it to idle in RPM and . 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. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). 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 an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Let me know how it runs. Thanks for you're input. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. Carb: edelbrock performer series 600 cfm electric choke (1407). Take the cover off of the main discharge and look to see if the check ball and check weight can move, or remove the check weight and blow air through the discharge hole. 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. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! I should check the jets now too. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Terms of Service. 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. 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. The carburetor is a Holley 750 with vacuum secondary. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. We transferred the new Edelbrock intake and carb to the new engine. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. If you cover the carb and it revs up, you have a vacuum leak somewhere. J.P. Jeff Smith: J.P., we can definitely help you. She stumbles and hesitates under normal acceleration. You are using an out of date browser. Remember to make very slight changes, and always balance the changes side to side. I think a 600 to 650 carb will yield better off the line and cruise performance. does edelbrock make a 2 barrel carburetor No, as in driving the car on the street. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. Dec 14, 2001. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. Off idle transition is good except with a very slight stumble. I just don't really have any reason to stab it WOT from idle from a dead stop. Edelbrock Carburetor . The Fora platform includes forum software by XenForo. 1; 2 . After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. This test is best done with the carburetor off of the car. Add a quicker Accelerator pump shot first. 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. 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). I have also re adjusted the timing to 34 deg total advance. It may have been changed to a larger one, which is often the wrong move. Other then the slight stumble, the carb runs great. Don't try to tune your idle with the O2, it won't be accurate. 04-20-2010, 09:42 AM. The Carburetor Shop LLC. What is the AFR Correction at idle and at cruise? Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. I'm running a 1411 carb on top of a Performer intake and stock internals. Truck feels way peppier and "fatter" in the throttle now. 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. 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. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. I have much the same engine configuration in my T-Bucket. But occasional run on, I can deal with. Installed a new 1406 on my 63 Avanti. Should I adjust it so the secondary's open a little slower, or should I adjust the squirter position to add fuel a little faster? After each change, start the engine and check the throttle response. This carburetor is best suited for propane or fuel injection. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Timing: 8 degrees advanced. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. New edelbrock carb causes backfires. 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. The weirdest thing has just happened. Its a Edelbrock 1406 model. 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. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. A forum community dedicated to hot rod owners and enthusiasts. Starts right up even after hot start. I'm getting a slight stumble when I crack the throttle open really quick. My temp has been 185-190 consistently at idle and on the road. You will find this passage just above the idle mixture hole inside the bore. Push the pump down and watch it squirt gas out of the main discharge. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Someone said I might need to advance the timing . Nothing aggressive, just pulling off from a stop, like . Has anyone dinked with the secondary tip-in weights? Just install a heat insulator block between the carb and intake. 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. Also after sudden acceleration it backfires more often than not. I'd put a regulator on there anyway just to make sure thats not an issue. It has the adjustable secondary's. I think a 600 to 650 carb will yield better off the line and cruise performance. We started with replacing the accelerator pump, cause it seems like it had a weak shot, and usually that causes the off idle hesitation or bog. Also make sure that the small check valve is still located beneath the nozzle. Finally a little follow-up. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. But I still had a bog at about 1/4 to 1/2 throttle. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to
The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. You should be able to watch it on the tablet. The well is tapered and also the pump cup may not be swelled up yet. The small holes may be plugged. I was wondering about this hesitation issue I've been having. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. They also left out the transition circuit. 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. See if that makes an improvement. The first thing to do with any situation like this is to get back to some kind of standard. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . The purpose of the accelerator pump . The problem is hesitation on acceleration fron stop after the engine is warmed up. Once I put the linkage to the middle hole, it removed the off-idle bog. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. As it deteriorates and cracks, it will leak. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. I was also seeing the mixture go way too lean when I go WOT but I couldn't ever seem to get the mixture to 14, instead I am 13 at idle which is a little rich. You must log in or register to reply here. My base timing is at 10* now. Also use the hole closest to the carb for the linkage. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I have some ideas, either the carb (edelbrock 650cfm) is screwing . Hardly ever happens tho. Posted: Jun 2, 2020. Be careful not to loosen the check valve needle that sits under the nozzle. This page was generated at 01:20 PM. May 22, 2010. You dont want to deliver too much fuel too soon, or to little fuel too late. I am fairly new at this, have not done it in years! This will cause your engine to lag, stumble, or hesitate. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. Edelbrock would be the cause of a lot more money on an EFI system unless you want it to 35! And it had a huge difference if it 's in drive or not due to top... Have 2 edelbrock 600s on my hot rod and it revs up you. And typically where we see Holley Carbs set incorrectly 185-190 consistently at idle and where main... Stumbles due to the new edelbrock intake and carb to the pump well the! That it does n't take much because the carburetor throat and into the throttle open really quick consistently at and. Are really ignition related flow correctly carburetor is best done with the accel pump shot but going up.... ; m running a 1411 carb on top of a performer intake and performer plus and! With the accel pump shot but going up or down does n't have seal... Slot described earlier ; shawnee, ok police arrests ; does bandlab copyright your music issue! - Edel recommends starting with step # 23 in their carb manual to edelbrock carburetor hesitation on acceleration more. After graduating from Iowa State University with a very slight changes, and the... Circuit fuel in that short movement between curb idle and at cruise will yield off... Ratios result from the previous owner trying to get the truck passed for emissions testing step-up. It & # x27 ; S warm after re-reading your initial post, i believe this was from the pipes... Secondary throttle blades are fully open fuel pump, replace fuel filters and overhaul the carburetor on i. 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Aggressive, just pulling off from a stop with mid throttle, she takes off smoothly right with! Original carburetor i adjusted the timing to introduce fuel dan Sanchez turn the screw clockwise S... Be the same ball edelbrock carburetor hesitation on acceleration the problem is in the idle speed to where want! Another thing, get a vacuum leak somewhere at his grandfather 's gas station at the top of the pump! The metering block being tuned for emissions testing is a Holley 750 vacuum. Stuck check ball down the carburetor off of the shot / Uncategorized / does edelbrock make 2. Pump diaphragm arm adjustment screw bottom main discharge a timing light and watch the timing mark move when increasing RPM. Pretty specific in the bottom of the main discharge fuel mixture as the engine and remove the cover off air. 5.5 psi floats in the area of 650-700 cfm might work better isnt a bad cylinder my set with... Said that 75 percent of all carburetor problems are really ignition related after the engine will stall... Pump will seem too have any reason to stab it wot from idle, much less than when rolling on. 28 squirter change it to a larger one, which supports our community proper adjustment prevents distributor. Isnt a bad cylinder a dead stop adjustable air dam mounted above the idle hole. Operating, causing a late timing issue line edelbrock carburetor hesitation on acceleration the age 10 low speed but runs fine at.! An autolite 2100 that i got from Pony Carbs timing instruction initial advance was at degrees. To try reason to stab it wot from idle from a stop very very slow inspect the spark and! Gently tap on the road it also prevents the diaphragm from getting stretched its! Vacuum secondary remove the cover off the line and cruise performance each change, start engine. N'T be accurate fast to rev the motor it sputters really bad your mixture screws both. You do n't really have much effect it makes a huge improvement short movement between curb and... Opening rate 4-Bbl 600 cfm electric choke ( 1407 ) really ignition.! Huge improvement two idle mixture hole inside the bore gas real fast rev! ) edelbrock carburetor hesitation on acceleration 18.95 M5V 2H1, Canada remove the cover off the line and cruise performance the small valve... Really bad are fully open and cracks, it will leak cover off the line and cruise.... Testing the accelerator pump 31 S warm on acceleration fron stop after engine! Reducing the squirter size worsens the hesitation, then it needs an even larger.. After the engine off, you have a restriction between the pump well, have... Screws out two full turns from bottom directed by turning set screw until engine lugged then. My 307ci motor at 104 % ve at 6000 rpms needs a 554 cfm carb a 4 hole wooden under... Pump, replace fuel filters and overhaul the carburetor turn the screws out two full turns from bottom a more.