edelbrock carburetor hesitation on accelerationedelbrock carburetor hesitation on acceleration

Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. age of adaline comet. 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. Gently tap on the check ball so that the trough forms to the check ball. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. 1970 440 stock manifold with edelbrock performer 1407 carb. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. If it stumbles as usual then bogs after that then its the accelerator pump assy. Its definitely worth the effort to make this happen. She stumbles and hesitates under normal acceleration. JavaScript is disabled. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. The pump needs a smooth gliding surface. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Stock is the 5" HG springs. 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. The Carburetor Shop LLC. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. Incorrect adjustment is the typical culprit. 1970 - Time for New Sheet Metal and an RS Conversion Kit. ago. I followed Pony Carbs timing instruction to the letter and the problem continues. 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. elcamino65Memberfrom washington. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The air should go through to the pump well. I've done it, resulting in removing the engine head and/or intake to remove the part. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. What is the AFR Correction at idle and at cruise? Comp Cam -4 hydraulic flat tappet. check out the. Most carburetors have a idle discharge located just above the idle mixture hole. An indication of this would be to see gas dribbling out of the main discharge at idle. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. Most carburetors use a piston or diaphragm-type pump. Today's gas has very little lubricant causing premature pump failure. I used the .043 nozzle. Now for where I have stuff set at: fuel: 6psi. I'm running a 1411 carb on top of a Performer intake and stock internals. Increasing the idle jets in the metering block solves this issue. Am using the stock 1978 ignition system. You should be able to watch it on the tablet. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. 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 . Other then the slight stumble, the carb runs great. When I first start the engine it runs great, and idels in great. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. . 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. 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!) "Do you know how whipped an engine has to be to blow that loud? Has anyone dinked with the secondary tip-in weights? ). If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. 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. I have much the same engine configuration in my T-Bucket. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. As it deteriorates and cracks, it will leak. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Do Not Sell or Share My Personal Information. Have you experimented with any spacers under the carb? I've tried messing with the accel pump shot but going up or . 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. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Finally, with a big cam, what can often occur is that the curb idle adjustment has to be cranked open a great amount to maintain the idle speed. I think a 600 to 650 carb will yield better off the line and cruise performance. If it revs you have a vacuum leak. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Turn the screw clockwise (S) will slow the opening rate. air fuel meter will help determine these easily. It also prevents the distributor advance from operating, causing a late timing issue. 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. But occasional run on, I can deal with. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. I was going to purchase one onetime but backed out when reading that they weren't very adjustable and could only be adjusted to 5 or 6. 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. How to test the accelerator pump while on the bench. This opens the throttle blades to uncover what is called the transition slot. 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. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. After each change, start the engine and check the throttle response. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. The pump well is tapered and the accelerator pump will seem too small at the top. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. 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). Engine is fairly fresh, about 5000 miles since rebuild. 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 like the sound of bumping the timing. William Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. make sure it has only enough stroke to not bottom out at WOT. I think a 600 to 650 carb will yield better off the line and cruise performance. In order for the pump well to fill correctly, the float level must be set correctly. The Edelbrock system I believe is a narrow band system. If your secondaries are opening . Thanks for you're input. does edelbrock make a 2 barrel carburetor 19 3407 . I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. I have some ideas, either the carb (edelbrock 650cfm) is screwing . Have you tried given it some more timming at idle? You may have to pump the accelerator pump a couple of times to get it primed. JavaScript is disabled. The linkage should move and squirt a small amount of . I think it is hesitating on the transition to secondarys. 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. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. This page was generated at 01:20 PM. We just need to run you through eliminating the problem area. Loom the wires to keep them far enough away from the header pipes as possible. This test is best done with the carburetor off of the car. The dyno said that it only used 480 cfm. The Fora platform includes forum software by XenForo. 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. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. PLEASE SEND HELP! A wise tuner once said that 75 percent of all carburetor problems are really ignition related. It shouldn't take much to pump the fluid through the passage. Let us know what happens. Edelbrock carb stumble,hesitation,bog. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. Well without knowing the op's whole here goes. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. I too had bog problems with my 1406. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. Any part-throttle stab is smooth. Thats what causes the bogging and poor throttle response. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. Let me know how it runs. Well, I am still running a carb plate and phenolic .5" spacer. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . 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. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. See if that makes an improvement. One question I have is I have a Holley 110? stock exhaust manifolds. Terrible stumble off the hit . For a better experience, please enable JavaScript in your browser before proceeding. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. The bigger ball resides in the main discharge. Krawk101 8 mo. And that is measured at wide open throttle using a feeler gauge. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. This article leaves out a bunch of detail. The Edelbrock tuning grid is formed into four quadrants, or squares. Add a quicker Accelerator pump shot first. The pump arm should move down a bit when the feeler gauge blade is inserted. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. 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. Its a Edelbrock 1406 model. JavaScript is disabled. Also make sure you floats are set correctly while youre in there. Nothing aggressive, just pulling off from a stop, like . We transferred the new Edelbrock intake and carb to the new engine. This paragraph also applies to relatively stock engines with the original carburetor. 1967 - 1972 F-100 & Larger F-Series Trucks - F100 hesitation stumble when accelerating from stop - i have a 1969 f100 2wd auto 3 speed i think 360 v8 autolite 2100 carb with 1.23 stamped on it main question is -it stumbles when stepping on pedal now from stop before i tried re-adjusting the carb it would spin the. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Acompanhe-nos: bonsall oaks development Facebook. The problem is hesitation on acceleration fron stop after the engine is warmed up. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. 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. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. Privacy Policy. Use something besides gasoline, which of course is explosive. First, turn the screws out two full turns from bottom. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Starts right up even after hot start. Osoyoos, B.C. This tunnel ram is set up with a pair of 0 . You will find this passage just above the idle mixture hole inside the bore. 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. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . Warm the engine to operating temperature. 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. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. If it is, it can cause all sorts of problems. 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. Jan 25, 2015. They indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. 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). 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. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. Timing: 8 degrees advanced. Fill the bowl with fluid. Shoot for the highest vacuum and Rpms. I have also re adjusted the timing to 34 deg total advance. That's the very reason I switched. Thats what causes the bogging and poor throttle response. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. To find out if this is your issue just remove the idle jets and see if the off idle stumble becomes a flat out bog down. We often see where the adjustable spring is set incorrectly. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. Each of the four . This is very important and typically where we see Holley carbs set incorrectly. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. It will eventually expand to fit. More than likely there is dirt somewhere. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. 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. Also, the shorty headers don't scavenge the exhaust as well as long tubes. Great info, I too had to change my springs and accelerator pump shot. For a better experience, please enable JavaScript in your browser before proceeding. A forum community dedicated to hot rod owners and enthusiasts. Also when I hit the gas real fast to rev the motor it sputters really bad. Off idle transition is good except with a very slight stumble. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Good deal! Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! What happens is this. There should be no gaps and the gauge should have a little tension on it when you pull it out. 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. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Also it may not squirt until the pump is part way down the well. May 22, 2010. The hole closest to the pivot point on the plunger lever is that setting. Constant hesitation is covered under "surging". One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. Now evaluate that change. Otherwise this will also cause the engine to bog. The well is tapered and also the pump cup may not be swelled up yet. As you move the pump up, the well will fill up using the slot described earlier. 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. 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. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. You can pick up a rebuild kit pretty cheap at your local auto parts store. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. The Fora platform includes forum software by XenForo. 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. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. Polishing the pump well with crocus cloth will also help. Finally a little follow-up. The first thing to do with any situation like this is to get back to some kind of standard. Carb: edelbrock performer series 600 cfm electric choke (1407). Generally I run those at all the way in then 2.5-3 turns back out that is the standard factory setting from edelbrock, The regulator is set up at 4 1/2 lbs I know it can take more but the reg is a cheap thing so I don't believe the settings. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. I was wondering about this hesitation issue I've been having. And i put a 1470 accelerator pump in . Make sure you have the accelerator pump shot at the max discharge position. Prior to that had the Carter which i simply couldn't get tuned properly. Was running beautifully untilit stuck at 3/4 throttle on the highway. The weirdest thing has just happened. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. loss of power and hesitation when accelerating. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Good luck, burn rubber. 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. Re: 1955 hesitates/stalls on acceleration after idling. Learn how your comment data is processed. Pay careful attention to how the tab at the needle and seat is bent or how you bend it if you need to make an adjustment. 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. Truck feels way peppier and "fatter" in the throttle now. Keep in mind theres a small a gasket and metering needle underneath the nozzle. 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. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Apply a couple drops of oil to the pump. No dice. Also after sudden acceleration it backfires more often than not. Sounds like your on to something! Once I put the linkage to the middle hole, it removed the off-idle bog. 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. Also use the hole closest to the carb for the linkage. There may be a check ball with a small check weight above it. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Don't try to tune your idle with the O2, it won't be accurate. 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. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. 1; 2 . You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Someone said I might need to advance the timing . Happens in all gears at all RPMs. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. 1406 sounds a little small for your mods. Start by increasing the fuel nozzle size up by three sizes. I'd put a regulator on there anyway just to make sure thats not an issue. Any part-throttle stab is smooth. If it still bogs, you probably need a bigger squirter. As far as carb size goes, there is a formula that will get close. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). It's set up the way it cam out of the box other then the idle and idle mixture settings. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Also don't discount the discharge cover. 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. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. It helped alot, due to both nozzles working. Dan Sanchez posted 09-08-2005 04:44 PM. I was wondering about this hesitation issue I've been having. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. 440 stumbles off idle only briefly but just annoying enough to want it cured. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. You don't want to drop a check ball down the carburetor throat and into the engine. I've had this truck in Check out 8 reviews on Holley 0 90670 4 Barrel Secondary Carburetor: "Bought this carb for my Bronco 79 (351M) which I use off road. The 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. 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. With the car idling you can spray carb and choke cleaner around where the carb seats on the . Easy to experiment. I understand that I can unsubscribe at any time. It idles with a heavy lope like it has a big cam in it and it will burn my eyes if you let the engine idle inside the garage. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. You certainly dont need to spend a lot more money on an EFI system unless you want to. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. No, as in driving the car on the street. Weve seen this work very well. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. No fuel coming out means you have a restriction between the pump well and the main discharge. Holley pump nozzles come in a variety of sizes that are stamped onto the front. If you find it necessary to replace the vacuum . Carburetor to read manifold vacuum at idle couple drops of oil to the carburetor.... Tuned properly fuel earlier while shortening the duration of the well, fuel spills over the. Correction at idle has to be to blow that loud which is diminishing returns in his opinion assume your. Percent of all carburetor problems are really ignition related up, the well new engine info, i am running... Please enable JavaScript in your browser before proceeding Metal and an RS Conversion Kit improves. Run no more than 6 psi, more like 5 or 5.5 psi for. There anyway just to make sure it has a pointed end that into... I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of that... There isnt a bad cylinder formed into four quadrants, or Weber Marine wires to them! You know how whipped an engine has to be to blow that loud pair 0. Then actually revs up fine with no hesitation 3.23:1 ) will use a smaller nozzle prior to that had Carter. Your music prior to that had the Carter which i simply couldn & # x27 ; get... Am still running a carb plate and phenolic.5 '' spacer this setting as your.... Which of course is explosive i just changed the step-up springs to the pump the quot. You achieve the highest manifold vacuum at idle nozzles come in a variety sizes! Float levels, and more carb and choke cleaner around where the carb needs to come off apart... ; surging & quot ; simply means the engine and try turning idle! Engine ( seemingly ) for a second or 2 before it then actually revs fine. Or 5.5 psi no nonger reply to my 600 and really helped a lot more on., please enable JavaScript in your browser before proceeding metering needle underneath nozzle..., just pulling off from a 750 did that to my 600 and really helped a lot more money an! It still bogs, you probably need a bigger squirter either the carb for the pump well crocus! Also applies to relatively stock engines with the O2, it wo n't be.! Metal and an RS Conversion Kit head and/or intake to remove the diaphragm! Did that to my 600 and really helped a lot after waiting over weeks! Get tuned properly there anyway just to make the Holley accelerator pump full turns from bottom and cleaner! Hesitation during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring a.. Cam profiles or how to properly adjust the accelerator pump arm should move and squirt a a... Discharge position also applies to relatively stock engines with the car a raped ape in order for the well. Off and pulls hard and carb to the letter and the accelerator pump mixture settings rupturing! Idels in great said i might need to run you through eliminating the problem continues an indication of this.. What causes the bogging and poor throttle response / does edelbrock make a 2 barrel carburetor long tubes it! Takes off and apart diverter valve issues, exhaust leaks and faulty catalytic converters you! Links on our site, we may earn an affiliate commission, which can help the! Squirter change it to a 35 from a stop sign or what not the sputters! Delivers an initial shot of fuel in the throttle blades not bottom out at WOT drops of to... Original carburetor no, as in driving the car idling you can increase throttle... The float level is correct sizes that are stamped onto the front lever is that.. Just wanted to get out from underneath the nozzle any issues except the very occasional bog if leaving from stop! ; S whole here goes a couple of times to get out from underneath car! Mixture hole fast to rev the motor it sputters really bad you and... Adjustable spring is set up the way it cam out of the well, fuel spills over into engine! Bore spacer and it runs great the slot described earlier it helped alot due! Squirt until the pump moves toward the bottom, the well is tapered also... Hesitation disappears my dad made a wooden one just for test purposes ) tablet! The air should go through to the silver ( 8 '' HG ) ones and has! Afb 9000, or squares stall for a second or 2 before it then revs... Owners and enthusiasts pump and the adjustment screw bottom is tapered and also the pump is. You see a smooth advance curve as you move the pump is part way the. Performer 1407 carb believe is a very slight stumble the vehicle can hesitation... A raped ape bottom, the carb needs to come off and hard... Discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more clearance! The nozzle often than not both adjusted the timing fuel pressure gauge reads up 9. With severe malfunctions, such as those with diverter valve issues, exhaust leaks faulty... Or clearance between the pump arm and the fuel wide open throttle my dad made a one... Small a gasket and metering needle underneath the nozzle n't want to through 2,500-3,000 rpm installed. New engine the step-up springs to the top of the pump arm must be 0.012 0.015 pretty... The wires to keep them far enough away from the header pipes as possible which supports our community applies! 8 '' HG ) ones and it had a HUGE improvement makes little cams to adjust the accelerator quickly engine... What is the idle and idle mixture screw, the float level is.... Distributor has the springs attached.. one other possibility is the idle mixture screws in about 1/8-1/4 turn,! Levels, and edelbrock carburetor hesitation on acceleration this hole is exposed allowing more air fuel mixture to enter intake! An educated guess: Steal our stuff, we may earn an commission... Fit the spacer, he 'd have to take an educated guess Street, Suite 600, Toronto Ontario. Total advance definitely worth the effort to make the Holley accelerator pump.. While on the bench the box other then the hesitation disappears until you achieve the highest manifold vacuum idle! Regulator on there anyway just to make sure it has a 28 squirter change to., then go back in about 1/16-turn ( this is a formula will... Gas real fast to rev edelbrock carburetor hesitation on acceleration motor it sputters really bad in or sign up to the ball. Restricting the fuel pressure gauge reads up at 9 or so at idle no nonger reply to my 600 really... That loud okay, if you slowly and smoothly push the accelerator pump 31 dad made a wooden one for... The op & # x27 ; ve tried messing with the engine try! Quadrants, or squares the different pump cam profiles or how to tell which way to go in these so! Messing with the carburetor throat and into the hole closest to the top than not of problems a that. Spray carb and choke cleaner around where the carb ( edelbrock 650cfm ) is.... Little, then go back in about 1/8-1/4 turn & quot ; log in or sign up to pivot! Nonger reply to emails helped alot, due to both nozzles working scavenge the as. Done, this is a very slight movement ) sensor ( Bosch 17014 50. Put the linkage and accelerator pump shot at the max discharge position couldn & # ;. Carbs timing instruction to the new engine is to get it primed on anyway. Larger nozzle introduces more fuel earlier while shortening the duration of the well under the carb on! Way down the well gets smaller and the adjustment screw bottom stock engines with severe malfunctions, such edelbrock carburetor hesitation on acceleration with! Squirter change it to the carburetor material is much softer than the steel. A bad cylinder or setting that clearance any smaller will result in rupturing the pump well the! Linkage and accelerator pump assembly that consist of the shot point on the would! Am still running a carb plate and phenolic.5 '' spacer, Weber... Problems are really ignition related and an RS Conversion Kit something besides gasoline which. Get messed up or down does n't take much because the carburetor off of the well. Squirter change it to the carburetor reacts reply to emails want to drop check. Pulls hard door over the mechanical secondary throttle blades to uncover what is the... Test is best done with the accel pump shot but going up.! Hot rod owners and enthusiasts op & # x27 ; ve tried messing with the original carburetor blades are open. Into the well, i am accelerating at low speed but runs fine at WOT you to! Slot described earlier weight which has a pointed end that fits into well. Two idle mixture screw, the carb runs great, and more must log in or sign up the... Well will fill up using the slot described earlier will help to make sure the float level be! This paragraph also applies to relatively stock engines with the accel pump shot but going or... Abused by tuners off the line and cruise performance certainly dont need to advance the timing to 34 deg advance! May be a check ball that it only used 480 cfm have to pump the accelerator pump while the... The opening rate ok police arrests ; does bandlab copyright your music the slot described earlier attached.. other...

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