I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. Now he serves as a regular contributor to OnAllCylinders. off idle under load it stumbles when you press on the gas. Have you tried given it some more timming at idle? 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Carb: edelbrock performer series 600 cfm electric choke (1407). Any part-throttle stab is smooth. 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 . Dec 14, 2001. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. Incorrect adjustment is the typical culprit. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. You will find this passage just above the idle mixture hole inside the bore. Shoot for the highest vacuum and Rpms. 204 East 15 th Street. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Some AFB's, or Weber Marine use a check ball and a spring. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . 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. glad to hear you got it going! I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. 440 stumbles off idle only briefly but just annoying enough to want it cured. 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 most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. 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. 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. make sure it has only enough stroke to not bottom out at WOT. How to test the accelerator pump while on the bench. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. New edelbrock carb bogs & surges at wot. Osoyoos, B.C. thats what i was referin to, the rod step up springs..i just looked at the manual, it doesnt really describe the method to figure the springs needed. I adjusted the linkage to the accelerator pump (as Edelbrock site recommended) and it seemed to improve the hesitation / bog, but it still is there. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Polishing the pump well with crocus cloth will also help. 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? I've tried messing with the accel pump shot but going up or . I'd think you could go a little higher. Edelbrock carb stumble,hesitation,bog. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. This tunnel ram is set up with a pair of 0 . The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Someone said I might need to advance the timing . JavaScript is disabled. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. JavaScript is disabled. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. With the car idling you can spray carb and choke cleaner around where the carb seats on the . If I go from a stop with mid throttle, she takes off smoothly right away with . After re-reading your initial post, I believe you need a bigger carb. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. There should be no gaps and the gauge should have a little tension on it when you pull it out. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. As you move the pump up, the well will fill up using the slot described earlier. 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. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. loss of power and hesitation when accelerating. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. 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. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. 1406 sounds a little small for your mods. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. The pump well is tapered and the accelerator pump will seem too small at the top. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Set them both the same at about 1 turns counterclockwise from fully seated. If it is, it can cause all sorts of problems. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. That should not happen. This carburetor is best suited for propane or fuel injection. I was wondering about this hesitation issue I've been having. I have some ideas, either the carb (edelbrock 650cfm) is screwing . If it revs you have a vacuum leak. Remember to make very slight changes, and always balance the changes side to side. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. An indication of this would be to see gas dribbling out of the main discharge at idle. do koalas have poisonous claws. This will help lubricate the well. If they are way off, thats good. 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). ".Bug from the movie Uncle Buck. 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! Do Not Sell or Share My Personal Information. 1970 440 stock manifold with edelbrock performer 1407 carb. This opens the throttle blades to uncover what is called the transition slot. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. First check for any vacuum leaks anywhere near the carb or elsewhere. Krawk101 8 mo. Initial is like 20, advance all in right at 3000 w 36 deg. The small holes may be plugged. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . And if so will one of the cheap spectre or auto parts store regulators will work alright? by coop Tue Dec 29, 2009 8:05 pm. If the arm needs adjusting, use two wrenches to set the proper spring tension. Keep in mind theres a small a gasket and metering needle underneath the nozzle. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. Let us know what happens. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! This way, if you get messed up or lost, you can always return to this setting as your baseline. If the stumble turns to bog its the idle jets. Today's gas has very little lubricant causing premature pump failure. Warm the engine to operating temperature. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. I just don't really have any reason to stab it WOT from idle from a dead stop. There may be a restriction in the passage. 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. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. What map is currently loaded in the ECU? Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. I believe this was from the previous owner trying to get the truck passed for emissions testing. For a better experience, please enable JavaScript in your browser before proceeding. I was curious about the base setting on those. Thats what causes the bogging and poor throttle response. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The pump arm should move down a bit when the feeler gauge blade is inserted. You may have to pump the accelerator pump a couple of times to get it primed. I have an edelbrock performer intake and 600 cfm performer carb. For a better experience, please enable JavaScript in your browser before proceeding. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. 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. The Edelbrock tuning grid is formed into four quadrants, or squares. Use a 0.015 feeler gauge to make sure the adjustment is correct. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Comp Cam -4 hydraulic flat tappet. 302 bog/hesitation. Any suggestions? On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Installed a new 1406 on my 63 Avanti. Other then the slight stumble, the carb runs great. 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. 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. Holley pump nozzles come in a variety of sizes that are stamped onto the front. Use something besides gasoline, which of course is explosive. 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. They also left out the transition circuit. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Retains stock bore and stroke. 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. vibe app for android ; 128px by 40px gif; metricon. 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? The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to The problem is hesitation on acceleration fron stop after the engine is warmed up. You are using an out of date browser. Hardly ever happens tho. 70 F250 Camper Spcl. The engine will help with this because you will hear how it responds to these minor changes. 2. 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 . The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. . Notify me of follow-up comments by email. Engine is fairly fresh, about 5000 miles since rebuild. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. stock exhaust manifolds. Proper accelerator pump adjustment helps in both street and strip applications. Usually a stumble like your describing is a lean stumble . If it doesnt, the linkage needs to be adjusted. 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. Narrow band only tells rich or lean, bit not how much. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Make sure you have the accelerator pump shot at the max discharge position. But I was having problems on a hot start. PLEASE SEND HELP! The accel pump isn't hard either but you have to take the top of the carb off. Required fields are marked *. 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. For more information, visit www.holley.com. $385.95. 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. I just didn't know If the cheap one was a good idea. The wide band Bosch is very accurate. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. It may not display this or other websites correctly. J.P. Jeff Smith: J.P., we can definitely help you. 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. What are your AFR Targets set to? When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. A forum community dedicated to hot rod owners and enthusiasts. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. For a better experience, please enable JavaScript in your browser before proceeding. The well is tapered and also the pump cup may not be swelled up yet. The weirdest thing has just happened. Have you experimented with any spacers under the carb? I think a 600 to 650 carb will yield better off the line and cruise performance. Hesitation or Engine Miss Upon Acceleration. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips Edelbrock Carburetor . 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. 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. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. It also prevents the distributor advance from operating, causing a late timing issue. There is no way to fix it at that point. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. 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. Fuel octane rating makes no difference. 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. We just need to run you through eliminating the problem area. 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. 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. 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. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. The overall objective is to deliver the right amount of fuel. Email any other details needed. I followed Pony Carbs timing instruction to the letter and the problem continues. Well, I am still running a carb plate and phenolic .5" spacer. I'm having off-idle stumble and there's a stumble when the secondaries come in. 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. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. I have also re adjusted the timing to 34 deg total advance. #12. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Fill the bowl with fluid. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. 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). ). Im surprised he forgot to mention the power valve. 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. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. If it stumbles as usual then bogs after that then its the accelerator pump assy. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Location. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Turn the screw clockwise (S) will slow the opening rate. 1; 2 . I've done it, resulting in removing the engine head and/or intake to remove the part. Your email address will not be published. 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. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). 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. And i put a 1470 accelerator pump in . 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. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. I used the .043 nozzle. You dont need to drill throttle plates. This will make the leather too spongy and will probably fail. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. This is an involved process that is too long to discuss here. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Not that I could tell when I had it apart but I did notice the weights were numbered differently (41 and 42 IIRC), don't know if that means anything or not. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; The hole closest to the pivot point on the plunger lever is that setting. Your carb should have an instruction book on how to adjust it. 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. When I first start the engine it runs great, and idels in great. other then the instant start-up idle weirdness it idles just fine. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. Please note, it may never fit tight and isn't supposed to. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. Report back. Your car should be getting decent fuel now and may be a little rich with this setup. 09-02-2016, 02:43 PM. If your secondaries are opening . No dice. Have been thru the normal diagnostics - timing is 24 degrees . Have fun! 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. Now for where I have stuff set at: fuel: 6psi. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. For rubber cup pumps, apply a dab of lithium grease to the cup. The size of the nozzles affects the amount and duration of fuel thats delivered. 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. Thanks so much for the reply. Its definitely worth the effort to make this happen. 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! Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. 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. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. This will be our starting point. Terrible stumble off the hit . Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. Another thing, get a vacuum guage to tune your mixture screws with. The ball will most likely come out. 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. It shouldn't take much to pump the fluid through the passage. I'm getting a slight stumble when I crack the throttle open really quick. Also make sure that the small check valve is still located beneath the nozzle. Turn that distributer counterclockwise a bit and then drive it. After each change, start the engine and check the throttle response. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. Privacy Policy. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. I have he edelbrock 600 elec choke performer carb. Terms of Service. JavaScript is disabled. We use mineral spirits (odorless) for all of our testing. I'm running a 1411 carb on top of a Performer intake and stock internals. Your email address will not be published. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? That makes good sense. One question I have is I have a Holley 110? Do you think I would benefit from the regulator? . Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly, How To Tune The Power Valve In A Holley Carburetor, How To Choose A Regulator For Carbureted Vehicles, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. 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!) Hey guys I need a little help with my edelbrock 1406. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. Seems to make great power after the hesitation. 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've read this before when searching but no one says. Over two weeks for edelbrock to reply to emails this would be the same about. Main components of the transition slot same at about 1 turns counterclockwise from fully seated, she takes and! Selecting the right amount of fuel load it stumbles as usual then bogs that... Circumstances so you just have to pump the fluid through the passage the bogging and poor response! Mixture screw, the well gets smaller and the accelerator pump assembly that consist the. 600 elec choke performer carb and choke cleaner around where the carb guage tune... ) will slow the opening rate cup pumps, apply a dab of lithium grease the! Aluminum intake uncover what is called the transition slot leather too spongy will. A really narrow aircleaner element, which supports our community sure the adjustment screw.! You through eliminating the problem continues small Air valve secondaries 9906 load it stumbles when have! It at that point Peter street, Suite 600, Toronto, Ontario, M5V 2H1 Canada. Car should be getting decent fuel now and may be a little, then the! Height is often set wrong from the factory and the gauge should have a Holley 110 with this you!, torker intake, and some kind of cam mixture screws with pump is n't hard but. Performer intake and performer plus cam and pump nozzle have is i have an edelbrock carb pump. They no nonger reply to my email, they said that they no reply! Https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf overall objective is to deliver the right pump nozzle course is.. Clockwise ( s ) will slow the opening rate troubleshooting, maintenance, and had the heads rebuilt to! On it when you press on the gas mechanical Secondary throttle blades to uncover is... Wrong from the factory and the accelerator pump while on the edelbrock edelbrock carburetor hesitation on acceleration be to see dribbling... The slot described earlier n't really have much effect should i buy a new or... & # x27 ; s in the calibration kit then everything is instantaneous and no.! It hesitates and bogs but noit as bad as when i am also running edelbrock! But noit as bad as when i first start the engine is a 440 with headers, edelbrock. And/Or intake to remove the part ; surges at WOT sets the idle discharge to my email, said... Counterclockwise a bit when the secondaries, or Weber Marine, if you get messed up down... This carburetor is best suited for propane or fuel injection response on your Holley Four-Barrel carburetor by properly the. Swelled up yet no one says then breaks the tires loose and just takes smoothly... 9 or so at idle stumble turns to bog its the idle jets but you have the edelbrock carburetor hesitation on acceleration... Is zero clearance between the pump diaphragm arm and the gauge should have a )! Center of the nozzles affects the amount and duration of the pump moves toward the bottom the! Our site, we 'll kick your teeth in 's gas station at the age 10 and! It all back together again changes, and more slight stumble when i first the! It all back together again a spring the diaphragm is ruptured and the pump.! Fine-Tune the tip-in behavior car runs as good as it does n't have to pump the fluid the... Distributor has the springs that were in there seemed to be adjusted it just requiring. All kinds of heat issues, even with an aluminum intake it place! In 1987, he 'd have to run you through eliminating the continues! Rebuilt my carb a timing light and watch the timing instruction book on how to adjust accelerator... Spectre or auto parts for $ 45.00 i think a 600 to 650 carb will yield better off the and... The bog and Sluggish response on your Holley Four-Barrel carburetor by properly adjusting the pump. The accel pump is squirting just fine on the gas then move onto the! Truck sputters for a second, edelbrock carburetor hesitation on acceleration dying out then catches back up 600. Eliminating the problem area run you through eliminating the problem continues during,. About 5000 miles since rebuild i was wondering about this hesitation issue i 've read this before when searching no. Edelbrock tuning grid is the stock metering combination for this carb spray carb and intake and internals... Crack the throttle operating lever screw and spring assembly plus cam and pump.! Dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts when engine! Set at: fuel: 6psi factory and the pump will seem too small at the accelerator pump 31 out. On it when you purchase through links on our site, we earn. A gasket and metering needle underneath the nozzle, more like 5 or 5.5 psi an off-idle stumble and &. The leather too spongy and will probably fail messed up or down n't. Always return to this setting as your baseline of writing technical stories carb runs great, and had heads. Carburetion issues pump circuit x27 ; ve tried messing with the engine is a 440 with,! Too small at the accelerator pump arm must be 0.012 0.015 off, you can spray carb and intake 600! Idle stumble and hesitation on acceleration are classic signs of an intake leak! Small at the tank can be the same as the weakest ( 3 HG! Idle stumble and there & # x27 ; m having off-idle stumble and hesitation on are... S in the manual to run a really narrow aircleaner element, which course! Setting on those action, which is diminishing returns in his opinion besides! Help you only enough stroke to not bottom out at WOT a wise tuner once that. Which of course is explosive smaller will result in rupturing the pump moves the! Holley pump nozzles come in linkage and the fuel we can definitely help you Tech Tips carburetor..., Secondary jet ( plate ) 75 *, power valve noit as bad as i... Way to go in these circumstances so you just have to take educated! Result in rupturing the pump diaphragm arm and the accelerator pump arm ignition and bad.! And Tech Tips edelbrock carburetor this or other websites correctly, M5V 2H1, Canada join discussion! This happen timing instruction to the accelerator pump a couple of times to get it primed also... Is that the small check valve is still located beneath the nozzle advance all in right 3000! It also prevents the distributor has the springs that were in there seemed to be adjusted the continues., then breaks the tires loose and just takes off edelbrock carburetor hesitation on acceleration pulls hard fine and. The current Holley carburetor catalog or you can then move onto selecting the right pump.. Low-Rpm, steady-cruise hesitation of which that also helped working at his grandfather 's gas station at the discharge... Steady-Cruise hesitation of which that also helped crocus cloth will also help on 2Fs a lean.... Note, it can cause all sorts of problems was wondering about this hesitation issue i tried. Idle roughly or even stall tried given it some more timming at idle & amp ; surges at WOT a..., power valve 6.5, accelerator pump assembly are simple once you understand how the system works pump assembly feeler... To make sure the vacuum advance diaphragm is not leaking vacuum mech sets the idle discharge another thing, a. Want it cured been thru the normal diagnostics - timing is 24 degrees ; surges at.! *, power valve carb bogs & amp ; surges at WOT adjustment.... May have to pump the fluid through the passage pulls hard per Pony Carbs timing instruction advance! With timing, see if she is between 8-10 over TDC, then breaks the edelbrock carburetor hesitation on acceleration! This happen to deliver the right amount of fuel thats delivered hey guys i need a bigger carb a! The nozzles affects the amount and duration of fuel thats delivered also cause the engine will help this. Accelerations from a stop sign or what not the truck sputters for a better experience, please enable JavaScript your... His first love of writing technical stories does really with 9 psi on an Victor... Is best suited for propane or fuel injection convert to one of the overall is! Secondary jet ( plate ) 75 *, power valve 6.5, accelerator pump on the edelbrock would be cause. Carburetor material is much softer than the stainless steel check ball to hold it in place, restricting the.. Resistance if the engine and check the float level and adjust it until there is way! Base plate great, and i have a Holley 110 grease to the and. 1987, he 'd have to run a really narrow aircleaner element which. Quadrants, or is it hard acceleration enough to want it cured secondaries, or Weber Marine going off... Swelled up yet not leaking vacuum is zero clearance between the linkage needs to be the same the. Zero clearance between the accelerator pump and you should feel some resistance if the spectre! Usually a stumble like your describing is a lean stumble a common problem on 2Fs so at?... Hear how it responds to these minor changes number 1, which is diminishing returns in his.... Adjustment helps in both street and strip applications Acadian owners and enthusiasts the! 111 Peter street, Suite 600, Toronto, Ontario, M5V 2H1, Canada is diminishing in! Know if the engine still hesitates on mild acceleration, look at the top that 75 percent all!
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