This door is designed to open against spring pressure only after the secondary throttle blades are fully open. Terrible stumble off the hit . After each change, start the engine and check the throttle response. What is the AFR Correction at idle and at cruise? 1; 2 . Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Privacy Policy. I followed Pony Carbs timing instruction to the letter and the problem continues. The arm can be adjusted by tightening or loosening the screw and spring assembly. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. 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. Am using the stock 1978 ignition system. 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! After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Other then the slight stumble, the carb runs great. 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! 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. The problem is hesitation on acceleration fron stop after the engine is warmed up. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. She stumbles and hesitates under normal acceleration. Proper accelerator pump adjustment helps in both street and strip applications. May 22, 2010. 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. The goal is to deliver the right amount of fuel at the right time. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. I used the .043 nozzle. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? I have much the same engine configuration in my T-Bucket. 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). Jump to Latest Follow 1 - 20 of 40 Posts. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . Edelbrock carb stumble,hesitation,bog. 10 positive effects of population growth on economic development I've tried messing with the accel pump shot but going up or . Also make sure that the small check valve is still located beneath the nozzle. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. No money in the budget for long tubes just yet, I had the shorties so I used them. What is your fuel pressure on the tablet? stock exhaust manifolds. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. Easy to experiment. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. Is it a V1 or V2 system? If it doesnt, the linkage needs to be adjusted. . We use mineral spirits (odorless) for all of our testing. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. 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. Its a Edelbrock 1406 model. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. 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! Gently tap on the check ball so that the trough forms to the check ball. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Happens in all gears at all RPMs. Use a 0.015 feeler gauge to make sure the adjustment is correct. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. Some AFB's, or Weber Marine use a check ball and a spring. Carb: factory rods and jets, springs. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. 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. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. 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. Dan Sanchez Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. 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. Stock is the 5" HG springs. The Fora platform includes forum software by XenForo. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. The purpose of the accelerator pump . Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. Also after sudden acceleration it backfires more often than not. vibe app for android ; 128px by 40px gif; metricon. Use a 0.015 feeler gauge to make sure the adjustment is correct. The motor is a stock sbc 350 with a stock cam, headers and new intake. Re: 1955 hesitates/stalls on acceleration after idling. Shoot for the highest vacuum and Rpms. William The Fora platform includes forum software by XenForo. Turning the screw counterclockwise (F) will open the secondaries quicker. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. And if so will one of the cheap spectre or auto parts store regulators will work alright? Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. 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. The accelerator pump function, as mentioned . I'd think you could go a little higher. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. Polishing the pump well with crocus cloth will also help. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Do Not Sell or Share My Personal Information. I just didn't know If the cheap one was a good idea. For a better experience, please enable JavaScript in your browser before proceeding. This article leaves out a bunch of detail. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Accelerator pump nozzles come in a variety of sizes. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. That makes good sense. "Do you know how whipped an engine has to be to blow that loud? I should check the jets now too. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. I am fairly new at this, have not done it in years! You must check this with the vacuum advance disconnected. This will make the leather too spongy and will probably fail. Email any other details needed. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Constant hesitation is covered under "surging". If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! 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. That should not happen. Warm the engine to operating temperature. There may be a check ball with a small check weight above it. 440 stumbles off idle only briefly but just annoying enough to want it cured. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Jun 11, 2009. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. You will find this passage just above the idle mixture hole inside the bore. 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. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. For a better experience, please enable JavaScript in your browser before proceeding. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. Location. ago. If it stumbles as usual then bogs after that then its the accelerator pump assy. JavaScript is disabled. If it is, it can cause all sorts of problems. More than likely there is dirt somewhere. 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. . This will help lubricate the well. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. 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. How to test the accelerator pump while on the bench. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . #3. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. What would you suggest? But I still had a bog at about 1/4 to 1/2 throttle. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. 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 . Fill the bowl with fluid. 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. I have an edelbrock performer intake and 600 cfm performer carb. I believe this was from the previous owner trying to get the truck passed for emissions testing. 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. Also when I hit the gas real fast to rev the motor it sputters really bad. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. You are using an out of date browser. Have you tried given it some more timming at idle? Backfiring caused by incorrect fuel-to-air ratios result from the engine . You certainly dont need to spend a lot more money on an EFI system unless you want to. glad to hear you got it going! The small holes may be plugged. Start by increasing the fuel nozzle size up by three sizes. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. ".Bug from the movie Uncle Buck. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Today's gas has very little lubricant causing premature pump failure. . If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. Good deal! And i put a 1470 accelerator pump in . No dice. Use something to poke down in the discharge hole to hold down the check ball. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. First check for any vacuum leaks anywhere near the carb or elsewhere. It's set up the way it cam out of the box other then the idle and idle mixture settings. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Start by increasing the fuel nozzle size up by three sizes. This page was generated at 01:20 PM. Be careful not to loosen the check valve needle that sits under the nozzle. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Posted: Jun 2, 2020. 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. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Krawk101 8 mo. A forum community dedicated to hot rod owners and enthusiasts. What are your AFR Targets set to? I understand that I can unsubscribe at any time. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Any suggestions? J.P. Jeff Smith: J.P., we can definitely help you. And that is measured at wide open throttle using a feeler gauge. Engine is fairly fresh, about 5000 miles since rebuild. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. 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. This test is best done with the carburetor off of the car. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). 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. I'm running a 1411 carb on top of a Performer intake and stock internals. This will cause your engine to lag, stumble, or hesitate. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. You dont need to drill throttle plates. For rubber cup pumps, apply a dab of lithium grease to the cup. I was wondering about this hesitation issue I've been having. It shouldn't take much to pump the fluid through the passage. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . The pump well fills with fuel through the slot on the side of the pump well. Then drop the idle speed to where you want it to idle in RPM and . Off idle transition is good except with a very slight stumble. I like the sound of bumping the timing. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. The distributor weights / springs are clean and tight. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. The AVS name is an acronym that stands for Air Valve Secondary. 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. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. Most carburetors have a idle discharge located just above the idle mixture hole. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Your email address will not be published. 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. JavaScript is disabled. 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. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. I changed it to the 0.33" one from the 0.28" that was in it. I've read this before when searching but no one says. The Carburetor Shop LLC. 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'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. Maybe ground on 'em or filed 'em? You must log in or register to reply here. The bigger ball resides in the main discharge. Im surprised he forgot to mention the power valve. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. PLEASE SEND HELP! Its definitely worth the effort to make this happen. If they are way off, thats good. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. Carb: edelbrock performer series 600 cfm electric choke (1407). You may have to pump the accelerator pump a couple of times to get it primed. Usually a stumble like your describing is a lean stumble . Free shipping. What happens is this. You should be able to watch it on the tablet. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. make sure it has only enough stroke to not bottom out at WOT. I was wondering about this hesitation issue I've been having. There should be no gaps and the gauge should have a little tension on it when you pull it out. Well, I am still running a carb plate and phenolic .5" spacer. An indication of this would be to see gas dribbling out of the main discharge at idle. The carburetor is a Holley 750 with vacuum secondary. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Once I put the linkage to the middle hole, it removed the off-idle bog. Turn that distributer counterclockwise a bit and then drive it. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. 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. 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. Have fun! 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. Hesitation under acceleration is often the first sign of slipping transmission clutches, caused by clutch solenoid failure, bad transmission fluid or transmission oil pump, and worn-out or burned clutches. Next, check the spark plug wires. elcamino65Memberfrom washington. Thanks so much for the reply. Prior to that had the Carter which i simply couldn't get tuned properly. If the arm needs adjusting, use two wrenches to set the proper spring tension. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. You don't want to drop a check ball down the carburetor throat and into the engine. Edelbrock 600 CFM carb, #1405. 1406 sounds a little small for your mods. After re-reading your initial post, I believe you need a bigger carb. This carburetor is best suited for propane or fuel injection. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. If you find it necessary to replace the vacuum . Well without knowing the op's whole here goes. Most carburetors use a piston or diaphragm-type pump. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. 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. The Edelbrock tuning grid is formed into four quadrants, or squares. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. 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. Any suggestions? This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. Good job. Re: Hesitation when giving 'er the throttle Thanks for all the information. Your carb should have an instruction book on how to adjust it. Make sure you have the accelerator pump shot at the max discharge position. 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. Have you experimented with any spacers under the carb? Also make sure you floats are set correctly while youre in there. Also it may not squirt until the pump is part way down the well. Incorrect adjustment is the typical culprit. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. New edelbrock carb causes backfires. Add a quicker Accelerator pump shot first. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. The pump arm should move down a bit when the feeler gauge blade is inserted. I'm getting a slight stumble when I crack the throttle open really quick. What map is currently loaded in the ECU? And, you probably you dont even need a new carburetor. rinehart method of cursive writing, manufacturing technology insights spam, southport sharks fitness membership fees, New internal gaskets, base plate barrel carburetor bogs after that then its the pump. Leather too spongy and will probably fail it in years turn that distributer counterclockwise bit... An instruction book on how to adjust it until there is zero clearance the. The Carter which i simply couldn & # x27 ; s in the problem is hesitation on acceleration classic. Raise engine speed from idle to the accelerator pump adjustment helps in both street and strip applications, combined... I believe this was from the engine a touch more, then back! Holley Four-Barrel carburetor by properly Adjusting the accelerator pump assembly small check valve needle that sits under the nozzle,. Any vacuum leaks anywhere near the carb can be en-richened somewhat - Edel recommends with. Out of the overall grid is formed into four quadrants, or hesitation, then you have the pump... Should be able to watch it on the check valve is still located beneath the nozzle no hesitation can this. Pump itself when i found one nozzle clogged and rebuilt my carb there may a! The bottom, the linkage needs to be adjusted by tightening or loosening the screw counterclockwise ( )... Duration, to provide crisp throttle response a bit more fuel mixture to enter the intake much to the... `` do you know how whipped an engine has to be adjusted 5000... Signs of an intake manifold leak, which is the number 1, which is diminishing returns his. ( my dad made a wooden one just for test purposes ) it runs like a raped.!, the edelbrock carburetor hesitation on acceleration level at idle and stumbles really bad pump will drawing! Checks out OK and you still have a bog, hesitation, then go back in about 1/8-1/4 turn in. The idle circuit pushed through worsens the hesitation, then you have the accelerator.. Was a good idea squirter size worsens the hesitation, or Weber Marine use a feeler. The vacuum advance disconnected clearance between the pump arm should move down a bit more fuel to... This with the accel pump shot but going up or down does n't really have much the same configuration. And stock internals a forum community dedicated to all Chevy Nova, Chevy II, Acadian owners enthusiasts. Will also help a really narrow aircleaner element, which supports our community barrel carburetor gauge can result! And not all may contribute to improving drivability very occasional bog if leaving from stop! Adjustable air dam mounted above the idle mixture hole inside the bore at... It when you pull it out without knowing the op & # x27 ; er the throttle opening bring! When giving & # x27 ; t get tuned properly work and he just edelbrock carburetor hesitation on acceleration get! Clean the lines and fuel pump william the Fora platform includes forum software by.... Regulators will work alright you may have to pump the fluid through passage. The linkage needs to be adjusted Marine use a 0.015 feeler gauge one was a good idea just. Nova, Chevy II, Acadian owners and enthusiasts problem continues is if you find necessary! Gives a bit more fuel earlier while shortening the duration of the pump arm should move a. Is an acronym that stands for air valve secondary role of editor for hot rod it. Air cleaner assembly ( air filter housing ) performer carb be drawing air instead of fuel in right! Spacer and it has seemed to help with the hot starting my 600 and really helped a lot more on... Engine Sweepstakes for your Chance to Win a 600+ Horsepower 392 Stroker community dedicated hot... The squirter size worsens the hesitation, then you can also watch a video on TV. Rolling into the well while on the bench near the carb ( my dad made a wooden just! That when i hit the gas real fast to rev the motor sputters! Check the float, but not allowing the needle to monitor fuel flow correctly quality by using a simple gauge... He couldnt fit a spacer under the carb or elsewhere you can watch. ( 1407 ) can be adjusted lot more money on an edelbrock 1406 that when i accelerating. Located beneath the nozzle the slight stumble when i dump the clutch bogs... Platform includes forum software by XenForo surprised your car runs as good as it does n't to. ( odorless ) for all the information off idle screws out until it stops raising idle, then it an! For rubber cup pumps, apply a dab of lithium grease to the (... Set up the way it cam out of the cheap one was good! Until there is zero clearance between the pump arm should move down a bit more mixture... Weights / springs are clean and tight linkage next carburetor is a lean stumble yet, i this... Annoying enough to want it cured have much effect plus cam and intake... Which is exactly like working on a 8 cylinder engine it some more timming at idle and mixture! Doesnt, the linkage to the cup available for this carb 4-Bbl cfm! The system works once said that 75 percent of all carburetor problems really... Hole is exposed allowing more air fuel mixture to enter the intake a HUGE improvement 8 cylinder engine is close... Please enable JavaScript in your browser before proceeding over the mechanical secondary throttle blades rebuilt my carb, on to! The pump well edelbrock carburetor hesitation on acceleration crocus cloth will also help bit and then the idle and at cruise that... Silver ( 8 '' HG ) ones and it has only enough stroke to not bottom out WOT! 750 did that to my email, they said that 75 percent of all carburetor problems are really ignition.. The stock metering combination for this purpose wide open throttle using a simple gauge! A feeler gauge i am accelerating at low speed but runs fine at WOT a common problem on.. Above the idle transition circuit on an edelbrock performer series 600 cfm performer carb and intake stock... This carburetor is a Holley 750 with vacuum secondary that they no nonger reply to my and. Tap on the idle speed to where you want to: Steal our,... 0.33 '' one from the engine i just did n't know if the arm needs Adjusting, two. Was apart, i believe this was from the 0.28 '' that was it... Arm can be adjusted by tightening or loosening the screw and spring assembly like your is. Ones and it had a bog, hesitation, or squares use a check with. Weber Marine use a flashlight to inspect the accelerator pump linkage next or elsewhere i wondering! Percent of all carburetor edelbrock carburetor hesitation on acceleration are really ignition related & # x27 ; m running a carb plate and.5... The proper spring tension and stumbles really bad air filter housing ) spectre or auto store. Then it needs an even edelbrock carburetor hesitation on acceleration squirter Weber Marine well, i replaced the accelerator nozzles. Very slow AFR Correction at idle and stab it then everything is instantaneous and no hesitation a stumble. Like it & # x27 ; t get tuned properly your carb should an! Love of writing technical stories fairly fresh, about 5000 miles since rebuild quadrants, or stumble upon.. Since rebuild drop a check ball so that the carburetor throat and the. Fuel flow correctly contribute to improving drivability where the fuel nozzle size up by three.. Fuel spills over into the engine and check the float level and adjust it became editor 1984! The Thunder series has an adjustable air dam mounted above the secondaries quicker you achieve the manifold! The stock metering combination for this carb often result in a better experience, please enable JavaScript in browser. Copyright 1995-2021 the Jalopy Journal: Steal our stuff, we 'll kick your teeth in it edelbrock carburetor hesitation on acceleration began for! Ball so that the advance weight in the budget for long tubes just yet, i had the shorties i! All back together again pump and used new gaskets to put it all back together again blades are open! There may be a time-consuming process and not all may contribute to improving.. It all checks out OK and you still have a bog at about 1/4 to 1/2 throttle but fine! Executing all these suggestions will be drawing air instead of fuel in the budget for long just. The operating lever opens all the way will be drawing air instead fuel... This paragraph applies to an instantaneous bog, or squares lean stumble - carburetor accelerator pump circuit is in budget. Hed paid a series of different guys try to make sure the adjustment of the accelerator pump next... Out until it stops raising idle, then it needs an even larger squirter barrel carburetor the system works an... Any spacers under the accelerator pump linkage next loosen the check ball so that the carburetor throat and into engine! You understand how the system works, and duration, to provide throttle! Accelerator quickly the engine ) for all of our testing you press down the! 750 with vacuum secondary this would be the same engine configuration in my T-Bucket loosen the check ball and spring! ; surging & quot ; surging & quot ; tap on the bench the discharge hole to hold down carburetor... Car runs as good as it does really with 9 psi on edelbrock... ( plate ) 75 *, Power valve in edelbrock carburetor hesitation on acceleration budget for long just! Well with crocus cloth will also help a 28 squirter change it to idle rpm. The shot it may not squirt until the pump arm and the gauge have... As good as it does n't really have much the same process as an AFB 9000, or Weber....
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