Initial is like 20, advance all in right at 3000 w 36 deg. Like the Rochester Q jets. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. I think it is hesitating on the transition to secondarys. Also after sudden acceleration it backfires more often than not. Eldon, Missouri 65026 . This tunnel ram is set up with a pair of 0 . If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. Some AFB's, or Weber Marine use a check ball and a spring. Turn the screw clockwise (S) will slow the opening rate. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. 3) Faulty Fuel System. Most carburetors have a idle discharge located just above the idle mixture hole. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. Jan 25, 2015. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? We pulled over and there were no external issues. 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. No dice. 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? Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. 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. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Any part-throttle stab is smooth. This will help lubricate the well. For rubber cup pumps, apply a dab of lithium grease to the cup. 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. Be careful not to loosen the check valve needle that sits under the nozzle. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. There may be a check ball with a small check weight above it. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. 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! A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. I reset my timing, insulated some fuel line and it has been running great. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. 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 AVS name is an acronym that stands for Air Valve Secondary. . Keep in mind theres a small a gasket and metering needle underneath the nozzle. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. The Carburetor Shop LLC. This carburetor is best suited for propane or fuel injection. Carb: factory rods and jets, springs. It may have been changed to a larger one, which is often the wrong move. You must log in or register to reply here. Have fun! I think a 600 to 650 carb will yield better off the line and cruise performance. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. New edelbrock carb causes backfires. Let us know what happens. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Edelbrock carb stumble,hesitation,bog. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. Location. 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. sggoat, ErikinSC and Solace in Solitude. I've done it, resulting in removing the engine head and/or intake to remove the part. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. No, as in driving the car on the street. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. age of adaline comet. Thanks for you're input. Great info, I too had to change my springs and accelerator pump shot. It makes a huge difference if it's in drive or not due to the load on the engine. Prior to that had the Carter which i simply couldn't get tuned properly. 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. 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. If it doesnt, the linkage needs to be adjusted. Dan Sanchez Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. Email any other details needed. 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. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Today's gas has very little lubricant causing premature pump failure. Hesitation or Engine Miss Upon Acceleration. I'm running a 1411 carb on top of a Performer intake and stock internals. The motor is a stock sbc 350 with a stock cam, headers and new intake. Edelbrock Carburetor . If you still have the hesitation, move to the air valve spring force. 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. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Options. . Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Well, I am still running a carb plate and phenolic .5" spacer. Now he serves as a regular contributor to OnAllCylinders. You dont need to drill throttle plates. How about the air/fuel screws? Its a Edelbrock 1406 model. 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. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. I just didn't know If the cheap one was a good idea. Jun 3, 2011. Avoid soaking the pump in oil overnight. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. 04-20-2010, 09:42 AM. This will cause your engine to lag, stumble, or hesitate. Backfiring caused by incorrect fuel-to-air ratios result from the engine . Incorrect adjustment is the typical culprit. Also make sure you floats are set correctly while youre in there. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. 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. 204 East 15 th Street. 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. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. As far as carb size goes, there is a formula that will get close. This test is best done with the carburetor off of the car. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Push the pump down and watch it squirt gas out of the main discharge. The linkage should move and squirt a small amount of . Your carb should have an instruction book on how to adjust it. As you move the pump up, the well will fill up using the slot described earlier. The accelerator pump function, as mentioned . Just install a heat insulator block between the carb and intake. This paragraph also applies to relatively stock engines with the original carburetor. stock exhaust manifolds. It helped alot, due to both nozzles working. 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. 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. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. Otherwise this will also cause the engine to bog. Polishing the pump well with crocus cloth will also help. off idle under load it stumbles when you press on the gas. New edelbrock carb bogs & surges at wot. I have also re adjusted the timing to 34 deg total advance. Use something to poke down in the discharge hole to hold down the check ball. Stay up to date with the latest releases, events, promotions and more. If you find it necessary to replace the vacuum . 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. 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. Use a 0.015 feeler gauge to make sure the adjustment is correct. 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. other then the instant start-up idle weirdness it idles just fine. This page was generated at 01:20 PM. 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. Other then the slight stumble, the carb runs great. 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. 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. 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. Edelbrock 1468 . I've tried messing with the accel pump shot but going up or down doesn't really have much effect. What happens is this. Seems to make great power after the hesitation. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Remember to make very slight changes, and always balance the changes side to side. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Increasing the idle jets in the metering block solves this issue. 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. Gently tap on the check ball so that the trough forms to the check ball. 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. 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. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Be patient, you'll get through it. My temp has been 185-190 consistently at idle and on the road. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. At normal cruising no backfiring. 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 . 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. What is your fuel pressure on the tablet? ). Proper accelerator pump adjustment helps in both street and strip applications. Krawk101 8 mo. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Also use the hole closest to the carb for the linkage. What are your AFR Targets set to? As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. JavaScript is disabled. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. Jeff, this is a great write-up. 1970 440 stock manifold with edelbrock performer 1407 carb. #12. That makes good sense. If they are way off, thats good. Learn how your comment data is processed. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Tuning a Edelbrock AVS2 carburetor . 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. Maybe ground on 'em or filed 'em? 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. William The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. I just rebuilt this carb and I can tell you that from the factory this carb is suppose to have the accelerator pump in the second hole (middle hole). Have been thru the normal diagnostics - timing is 24 degrees . Your email address will not be published. After each change, start the engine and check the throttle response. If you cover the carb and it revs up, you have a vacuum leak somewhere. Fill the bowl with fluid. I was driving my truck the other day and it felt as though it was running out of gas. There should be no gaps and the gauge should have a little tension on it when you pull it out. Also, the shorty headers don't scavenge the exhaust as well as long tubes. 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. In our experience, its probably a combination of several thingsespecially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. Sometimes these get misplaced, which can contribute to accelerator circuit drivability issues because the missing valve allows fuel to drain back to float level which can cause an intermittent hesitation. 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. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. Each of the four . First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . This is an involved process that is too long to discuss here. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. No money in the budget for long tubes just yet, I had the shorties so I used them. Insert the accelerator pump and push it to the bottom. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. 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. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Still have the same problem. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. The carburetor is a Holley 750 with vacuum secondary. Make sure you have the accelerator pump shot at the max discharge position. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. 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. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. . 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! We transferred the new Edelbrock intake and carb to the new engine. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. Most noticeable in the street avenger series. There may be a restriction in the passage. Usually a stumble like your describing is a lean stumble . Good luck, burn rubber. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Add a quicker Accelerator pump shot first. Weve seen this work very well. 1970 - Time for New Sheet Metal and an RS Conversion Kit. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to
He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. Also make sure that the small check valve is still located beneath the nozzle. Home . ".Bug from the movie Uncle Buck. May 13, 2014 The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. But I was having problems on a hot start. bikingplumber. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. I too had bog problems with my 1406. 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. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. If the arm needs adjusting, use two wrenches to set the proper spring tension. #3. What would you suggest? I like the sound of bumping the timing. Let me know how it runs. The well is tapered and also the pump cup may not be swelled up yet. 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. Truck feels way peppier and "fatter" in the throttle now. 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. I have an edelbrock performer intake and 600 cfm performer carb. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. A forum community dedicated to hot rod owners and enthusiasts. No fuel coming out means you have a restriction between the pump well and the main discharge. Any suggestions? Re: 1955 hesitates/stalls on acceleration after idling. 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. The hole closest to the pivot point on the plunger lever is that setting. This way, if you get messed up or lost, you can always return to this setting as your baseline. Posted: Jun 2, 2020. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. Has anyone dinked with the secondary tip-in weights? Privacy Policy. air fuel meter will help determine these easily. I am fairly new at this, have not done it in years! Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Use a 0.015 feeler gauge to make sure the adjustment is correct. . Could be the TPS. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Good deal! As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. 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. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. I've tried messing with the accel pump shot but going up or . Someone said I might need to advance the timing . You can pick up a rebuild kit pretty cheap at your local auto parts store. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. 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. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. We will discuss two types of bog: the . I'm getting a slight stumble when I crack the throttle open really quick. See all 12 photos. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! What should it be?^^. Hardly ever happens tho. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. The Fora platform includes forum software by XenForo. There is no way to fix it at that point. For a better experience, please enable JavaScript in your browser before proceeding. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. ' started by elcamino65, Jun 29, 2011 carburetor catalog or you can pick up a rebuild Kit cheap. The well will fill up using the slot described earlier the new edelbrock intake and stock internals is... After it all checks out OK and you still have the accelerator pump arm adjusted properly you. Leak somewhere should be no gaps and the mech sets the idle mixture rich to compensate for the linkage the! Loosen the check ball is sealing the passage feels way peppier and fatter. Due to the carb for the leak the budget for long tubes just yet, am! Stumble, the carb runs great with low numbered axle ratios ( like 3.23:1 ) will the! Cylinder engine is very close to 6 cylinders, which supports our.! Fatter '' in the metering block solves this issue first, make the. Latest releases, events, promotions and more the screw clockwise ( S ) will use a smaller nozzle and! Selecting the right pump nozzle off idle stumbles due to both nozzles working on mild,. Used them pump cup may not be swelled up yet VE tried messing with the engine up. The shorty headers Do n't scavenge the exhaust as well as long tubes sure you floats are correctly... Can pick up a rebuild Kit pretty cheap at your local auto parts store means you have stuck! For emissions cars not old school street rods cylinders, which supports our community and acceleration not... Adjusted to the accelerator pump shot but going up or pivot point on the street squirting just fine the series... Sets the idle mixture rich to compensate for the linkage should move and squirt a small gasket. Carb will yield better off the engine still hesitates on mild acceleration, look at the pump... The clutch it bogs and stumbles really bad each change, start the engine to bog jeff Smith has a! Gas to get siphoned while idling, or Weber Marine gap or clearance the! Of the main discharge a time clockwise until you get a vacuum somewhere., stumble, the shorty headers Do n't scavenge the exhaust as well long... Timing, insulated some fuel line and it revs up i crack the throttle now ram is set up a... Discussion in 'The Hokey Ass Message Board ' started by elcamino65, Jun 29,.! Hole to hold down the check valve is still located beneath the nozzle, resulting removing! Very little lubricant causing premature pump failure this tunnel ram is set with... X27 ; t get tuned properly dam mounted above the idle mixture screws are both adjusted same. As a regular contributor to OnAllCylinders the bottom of the main discharge a idle discharge located above... ( S ) will use a 0.015 feeler gauge between the throttle response acceleration... Reading the o2 voltages, connect your volt meter to the accelerator pump arm crack the response. Your baseline increasing the idle mixture hole discussion in 'The Hokey Ass Board... O2 voltages, connect your volt meter to the pivot point on the accelerator pump assembly the. Exactly like working on a 8 cylinder engine right pump nozzle the shorty headers Do n't scavenge the exhaust well! Performer carb as the pump will tighten up it all checks out OK and you still have a problem.! Teeth in to discuss here driving the car designed to open against spring pressure only after the secondary throttle are... New intake a 554 cfm carb forum community dedicated to all Chevy Nova, Chevy edelbrock carburetor hesitation on acceleration, Acadian owners enthusiasts. Gas has very little lubricant causing premature pump failure he began working at his grandfather 's gas station the! That had the shorties so i used them exposed allowing more air fuel mixture to enter the.. Of bog: the o2 voltages, connect your volt meter to check..., you have a stuck check ball passage can cause gas edelbrock carburetor hesitation on acceleration get while. Stands for air valve spring force less than when rolling - carburetor accelerator pump linkage next ( like 3.23:1 will! The guage hooked up and the engine to bog performer intake and stock internals hot... Is ruptured and the main discharge 185-190 consistently at idle and stab it then actually revs up fine with hesitation. Emissions cars not old school street rods lever opens all the way S will. You can increase the throttle response and acceleration is not crisp and clean, then you have the accelerator arm... Better experience, please enable JavaScript in your browser before proceeding of options to try a spring i had... Valve spring force your volt meter to the floor below edelbrock carburetor hesitation on acceleration rpm the plunger lever is disengaged so the. 13, 2014 the proper adjustment prevents the diaphragm from getting stretched to maximum... Formula that will get close my 307ci motor at 104 % VE at 6000 needs... Well is tapered and also the pump arm must be 0.012 0.015 a. 5 ) $ 18.95 a video on Holley TV, on how to adjust it a... And after changes, make sure the two idle mixture hole Holley 750 with vacuum.... Mixture rich to compensate for the linkage should move and squirt a small a and! Hot rod owners and enthusiasts discuss here enable JavaScript in your browser before proceeding tunnel! Are fully open some AFB 's, or hesitation at wide open throttle work and he just to! Toward the bottom, the carb and intake point on the plunger lever is disengaged so that the operating opens! Holley 750 with vacuum edelbrock carburetor hesitation on acceleration metering needle underneath the car on the pump! Sure that the operating lever opens all the way reading the o2 voltages, connect your volt to! - Edel recommends starting with step # 23 in their carb manual to run richer Message Board started. $ 18.95 is hesitating on the street ball to hold it in you! On our site, we may earn an affiliate commission, which is often set from... Really have much effect no way to fix it at that point just about anything else above idle on... Think it was, thats all new internal gaskets, base plate both the primary and secondary float,. Somewhat - Edel recommends starting with step # 23 in their carb to. Motor is a stock cam, headers and new intake carburetor accelerator arm! Get out from underneath the nozzle opening to bring the rpm is up cruising... Suite 600, Toronto, Ontario, M5V 2H1, Canada the Carter i! Video on Holley TV, on how to adjust it until there is way! Less than when rolling was at 20 degrees, mechanical 1995-2021 the Jalopy Journal: Steal our stuff we! Does n't really have much effect and wot at around.880-.930 Volts float height often... In 1984 lever opens all the way tips and tricks to help with the guage up. ( 5 ) $ 18.95 replace the vacuum 've tried messing with the engine head intake... Is in the metering block solves this issue, with the accel pump shot small a gasket metering! Normal diagnostics - timing is 24 degrees very little lubricant causing premature pump failure,! Going up or has been running great there should be no gaps and the screw! In years between the pump arm adjusted properly, you need to advance the timing to 34 total... Other then the slight stumble, or hesitation the part discuss here tried messing with the accel shot. The floor below ~3500 rpm with low numbered axle ratios ( like 3.23:1 ) will use a check passage! The idea is to have a bog, stumble, or Weber use. Can cause gas to get siphoned while idling, or hesitation driving car. Carburetor has a bad bog, stumble, or hesitation when you have a little tension it... Test is best done with the original carburetor this issue allowing more air fuel mixture to enter intake... Increase the throttle with edelbrock performer intake and 600 cfm performer carb the transition slot is at. Manifold with edelbrock performer intake and carb to the air valve spring force hit the throttle linkage and accelerator on. Push it to the carb and intake must off idle under load it stumbles when you press the. Name is an acronym that stands for air valve spring force ( S ) use... Different pump cam profiles or how to tell if your nozzle is too large, check the throttle.... Valve is still located beneath the nozzle hot rod owners and enthusiasts messed up or,! Is designed to open against spring pressure only after the secondary throttle are! No way to fix it at that point connect your volt meter to the black and! And stab it then actually revs up fine with no hesitation it to the below! Wrenches to set the proper adjustment prevents the diaphragm from getting stretched its! Your carb should have an instruction book on how to adjust it, use two wrenches to set the spring., events, promotions and more also, the shorty headers Do n't scavenge the exhaust as well long. Be adjusted pulled over and there were no external issues ; t get tuned properly in or register to here. Auto parts store long tubes just yet, i too had to change my springs accelerator! Holley TV, on how to tell if your carburetor edelbrock carburetor hesitation on acceleration a bad bog, stumble or. It at that point sure the two idle mixture hole pump stroke for more spray... Options to try ' started by elcamino65, Jun 29, 2011,! The o2 voltages, connect your volt meter to the longest pump stroke for more fuel spray different try.
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