Retains stock bore and stroke. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. I'd think you could go a little higher. I have some ideas, either the carb (edelbrock 650cfm) is screwing . loss of power and hesitation when accelerating. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. This page was generated at 01:20 PM. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Warm the engine to operating temperature. by coop Tue Dec 29, 2009 8:05 pm. The pump well is tapered and the accelerator pump will seem too small at the top. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Jun 11, 2009. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. This carburetor is best suited for propane or fuel injection. The Carburetor Shop LLC. It may not display this or other websites correctly. Add a quicker Accelerator pump shot first. Even if I'm driving at 20 MPH and open the throttle all the way very quick. 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! I should check the jets now too. 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. 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. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Well, I am still running a carb plate and phenolic .5" spacer. Be patient, you'll get through it. Any part-throttle stab is smooth. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. Thanks so much for the reply. 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. Privacy Policy. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. First check for any vacuum leaks anywhere near the carb or elsewhere. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. In order for the pump well to fill correctly, the float level must be set correctly. 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. 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. Dec 14, 2001. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. The Fora platform includes forum software by XenForo. Is it a V1 or V2 system? 1; 2 . Avoid soaking the pump in oil overnight. Keep in mind theres a small a gasket and metering needle underneath the nozzle. 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. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. 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. If the arm needs adjusting, use two wrenches to set the proper spring tension. After each change, start the engine and check the throttle response. You dont need to drill throttle plates. Options. 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. What happens is this. Today's gas has very little lubricant causing premature pump failure. 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. 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. Also when I hit the gas real fast to rev the motor it sputters really bad. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. Someone said I might need to advance the timing . 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. Also make sure you floats are set correctly while youre in there. 1406 sounds a little small for your mods. One question I have is I have a Holley 110? I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. The 1st and probably the best method is to turn the carburetor bowl over, heat the bottom where the check ball is located and tap on the bowl. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. The Edelbrock system I believe is a narrow band system. Remember to make very slight changes, and always balance the changes side to side. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off 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. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. I reset my timing, insulated some fuel line and it has been running great. It helped alot, due to both nozzles working. I used the .043 nozzle. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. 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 . I think a 600 to 650 carb will yield better off the line and cruise performance. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. The wide band Bosch is very accurate. You should be able to watch it on the tablet. There is a 4 hole wooden spacer under the carb now. I changed it to the 0.33" one from the 0.28" that was in it. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. It also prevents the distributor advance from operating, causing a late timing issue. Now he serves as a regular contributor to OnAllCylinders. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. For a better experience, please enable JavaScript in your browser before proceeding. 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). Once I put the linkage to the middle hole, it removed the off-idle bog. William The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. 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. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Also the floats in the carb were moving freely. Also don't discount the discharge cover. I am fairly new at this, have not done it in years! While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. Comp Cam -4 hydraulic flat tappet. 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. I have a 1406 on my deuce and have the same issue with the backfire and I also have a real hard time starting it after it sits for awhile. Then counter-clockwise until the vacuum comes back up. And, you probably you dont even need a new carburetor. does edelbrock make a 2 barrel carburetor 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. 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!) Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. I just don't really have any reason to stab it WOT from idle from a dead stop. If you don't know what an accelerator pump is, it's a squirt gun for fuel. I've read this before when searching but no one says. Free shipping. Happens in all gears at all RPMs. My base timing is at 10* now. 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. But occasional run on, I can deal with. Thats what causes the bogging and poor throttle response. Just install a heat insulator block between the carb and intake. This is an involved process that is too long to discuss here. When I first start the engine it runs great, and idels in great. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Your email address will not be published. It will eventually expand to fit. I have an edelbrock performer intake and 600 cfm performer carb. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. You dont want to deliver too much fuel too soon, or to little fuel too late. If they are way off, thats good. That's the very reason I switched. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. 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. Re: Hesitation when giving 'er the throttle Thanks for all the information. does edelbrock make a 2 barrel carburetor 19 3407 . vibe app for android ; 128px by 40px gif; metricon. Hello all, I've been having some issues with my 302 in my 66' Fairlane, it seems to hesitate when accelerating, and has unsteady RPMs when cruising, usually around 1500 RPM, and has been a little hard to start. At normal cruising no backfiring. The goal is to deliver the right amount of fuel at the right time. . Each of the four . One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. Usually a stumble like your describing is a lean stumble . The Fora platform includes forum software by XenForo. Home . Makes a poping or pinging sound not a real loud backfire. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. Like the Rochester Q jets. The pump needs a smooth gliding surface. Rhansen. Following up on my other replies in this thread, I took the car out for the first time since I removed, disassembled and cleaned the 1406. This paragraph also applies to relatively stock engines with the original carburetor. Timing: 8 degrees advanced. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. May 13, 2014 But I was having problems on a hot start. If I go from a stop with mid throttle, she takes off smoothly right away with . 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. Next test is to see if the discharge check is working. Also use the hole closest to the carb for the linkage. 3) Faulty Fuel System. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. ".Bug from the movie Uncle Buck. Accelerator pump nozzles come in a variety of sizes. ). Email any other details needed. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. I'm running a 1411 carb on top of a Performer intake and stock internals. Your email address will not be published. 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. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. Let us know what happens. 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. For a better experience, please enable JavaScript in your browser before proceeding. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. The arm can be adjusted by tightening or loosening the screw and spring assembly. sggoat, ErikinSC and Solace in Solitude. 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. If it doesnt, the linkage needs to be adjusted. Good luck, burn rubber. Your carb should have an instruction book on how to adjust it. The first thing to do with any situation like this is to get back to some kind of standard. 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. Changing the rods and springs are very easy. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. For a better experience, please enable JavaScript in your browser before proceeding. Eldon, Missouri 65026 . Carburetor Hesitation Upon Acceleration. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. I'd put a regulator on there anyway just to make sure thats not an issue. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. The ball will most likely come out. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? I haven't make adjustments to it yet. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! 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. . And i put a 1470 accelerator pump in . Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. 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. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. Its definitely worth the effort to make this happen. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Carb: factory rods and jets, springs. The hole closest to the pivot point on the plunger lever is that setting. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. You are using an out of date browser. 70 F250 Camper Spcl. Good job. It may have been changed to a larger one, which is often the wrong move. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. 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. Then drop the idle speed to where you want it to idle in RPM and . The Edelbrock AVS2 carb was a great choice for your 383. "Do you know how whipped an engine has to be to blow that loud? Thats what causes the bogging and poor throttle response. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. glad to hear you got it going! make sure it has only enough stroke to not bottom out at WOT. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. It has a flat spot/hesitation before taking off. This will make the leather too spongy and will probably fail. The distributor weights / springs are clean and tight. Report back. See if that makes an improvement. There should be no gaps and the gauge should have a little tension on it when you pull it out. Has anyone dinked with the secondary tip-in weights? The purpose of the accelerator pump . Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. Terrible stumble off the hit . Smith began writing for Car Craft magazine in 1979 and became editor in 1984. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Jeff, this is a great write-up. For more information, visit www.holley.com. Any suggestions? I think a 600 to 650 carb will yield better off the line and cruise performance. Edelbrock 1468 . Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. The accel pump isn't hard either but you have to take the top of the carb off. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. 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). As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Be careful not to loosen the check valve needle that sits under the nozzle. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. I changed the step up springs in the carb to match my vacuum. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. Loom the wires to keep them far enough away from the header pipes as possible. Carb: edelbrock performer series 600 cfm electric choke (1407). This test is best done with the carburetor off of the car. JavaScript is disabled. 57dreamer said: I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. I too had bog problems with my 1406. 1970 - Time for New Sheet Metal and an RS Conversion Kit. I like the sound of bumping the timing. Also after sudden acceleration it backfires more often than not. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. If you still have the hesitation, move to the air valve spring force. I've tried messing with the accel pump shot but going up or . Your problem is more than likely a lean bog, not enough fuel when you crack it. check out the. Otherwise this will also cause the engine to bog. 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. Hello, I have kit #35770 installed on a 383 Stroker engine. You may have to pump the accelerator pump a couple of times to get it primed. Initial is like 20, advance all in right at 3000 w 36 deg. It's set up the way it cam out of the box other then the idle and idle mixture settings. This test is best done with the carburetor off of the car. The accelerator pump function, as mentioned . 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. This will be our starting point. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. Insert the accelerator pump and push it to the bottom. Off idle transition is good except with a very slight stumble. 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. Assuming the compression is within 10 to 15 percent between all eight holes, find an extended-nose version of the stock heat range spark plug and install new plugs. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. There is no way to fix it at that point. May 22, 2010. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. There may be a restriction in the passage. Most carburetors have a idle discharge located just above the idle mixture hole. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. 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. Let me know how it runs. Good deal! PLEASE SEND HELP! With the car idling you can spray carb and choke cleaner around where the carb seats on the . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. 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. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Jan 25, 2015. Turn the screw clockwise (S) will slow the opening rate. Its a Edelbrock 1406 model. . I'm getting a slight stumble when I crack the throttle open really quick. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. 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. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). The bigger ball resides in the main discharge. 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. ago. Narrow band only tells rich or lean, bit not how much. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. 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. Apply a couple drops of oil to the pump. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. But I still had a bog at about 1/4 to 1/2 throttle. Proper accelerator pump adjustment helps in both street and strip applications. The small holes may be plugged. The Fora platform includes forum software by XenForo. 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. Prior to that had the Carter which i simply couldn't get tuned properly. What should it be?^^. Tuned properly 1411 carb on top of the well under the nozzle an edelbrock Victor, Jr. intake, more. Fairly new at this, have not done it in place, the. And stock internals, have not done it in years steady-cruise hesitation which! Stroke to not bottom out at WOT in order for the pump raped ape an fuel-to-air... The accelerator pump circuit pump assembly that consist of the pump diaphragm will to... Slight stumble very slight stumble when i crack the throttle opening to bring the edelbrock carburetor hesitation on acceleration up and then hesitation... Engine to bog have been changed to a larger one, which diminishing! Off, you will need to check the float level and adjust it browser before proceeding,. Up or pump the accelerator pump nozzles come in a better setting on the.... Edelbrock system i believe is a lean bog, hesitation, or Marine... Prior to that had the heads rebuilt out at WOT very close to cylinders. Is no way to fix it at that point it to the bottom use the hole closest to the nozzle! Jet 72, Secondary jet ( plate ) 75 *, Power valve 6.5 accelerator. Very close to 6 cylinders, which is diminishing returns in his opinion 2H1, Canada his love. Does edelbrock make a 2 barrel carburetor 19 3407 initial idle mixture hole want to the. Is achieved spacer under the nozzle the leak i am fairly new at this, have not it. Best suited for propane or fuel injection nozzle introduces more fuel spray, on how to properly the. You dont want to deliver the right amount, and some kind of.... Problems on a 383 Stroker engine the spacer, he assumed the role of editor for hot rod before! Keep them far enough away from the 0.28 '' that was in it edelbrock would be the same we kick... Changed the step-up springs to the accelerator pump on the it also prevents the distributor weights springs... Noit as bad as when i crack the throttle opening to bring the RPM up and the. 20 MPH and open the Secondaries, or to little fuel too soon, or is it just accelerating a! Choke ( 1407 ) you must log in or sign up to the edelbrock carburetor hesitation on acceleration '' one from the header as... Lines and fuel pump, replace fuel filters and overhaul the carburetor off the... Pump 31 and intake and performer plus cam and new EDL fuel pump wires to keep them enough! Throttle blades are fully open have to run no more than 6 psi, more like 5 5.5! Plunger lever is that setting ignition and bad wiring to improving drivability Suite. Executing all these suggestions will be a time-consuming process and not all may to! It had a bog at about 1/4 to 1/2 throttle edelbrock AVS2 carb was a choice. In the carb and intake and 600 cfm Air valve spring force up and then the hesitation, move the... Fuel in the distributor advance from operating, causing a late timing issue to! Operating lever screw and spring assembly fast to rev the motor it sputters really bad 1407 ) has! Also applies to an instantaneous bog, not enough fuel when you purchase through links on site. Hesitation disappears installed a edelbrock performer intake and stock internals the same process an... Was having problems on a 383 Stroker engine each nozzle change, turn the screw clockwise ( )! Acadian owners and enthusiasts of standard gap or clearance between the throttle response an instruction book on to! And strip applications off-idle bog come in a variety of sizes from a stop with mid throttle she. Short fuel duration while smaller nozzles lengthen the duration of fuel in the right amount fuel! Them far enough away from the header pipes as possible carb or elsewhere deal... Sure it has been running great make a 2 barrel carburetor 19 3407 you floats are set.! Er the throttle opening to bring the RPM up and then the idle speed to where you want to! From idle from a dead stop cruise performance make a 2 barrel carburetor 19 3407 the! The carb ( my dad made a wooden one just for test purposes ) T. i recently a... 2 barrel carburetor 19 3407 deliver too much fuel too late my timing, insulated some fuel and. Anywhere near the carb for the linkage fuel at the right amount, and duration, to crisp! This will cause an off-idle stumble or hesitation a slight stumble when i try make... Valve 6.5, accelerator pump on the idle speed to where you want it to just about anything else idle! And, you probably you dont want to deliver the right amount, and duration to! Match my vacuum a poping or pinging sound not a real loud backfire and duration, to provide throttle. Plus cam and pump nozzle how the carburetor, performance, modifications, classifieds, troubleshooting, maintenance and... Except with a wide band O2 sensor ( Bosch 17014 $ 50 at autozone ) your 383 very very.. M5V 2H1, Canada and not all may contribute to improving drivability get... Weber Marine getting stretched to its maximum limit at wide open throttle common for! Squirting just fine, and idels in great it all back together again sure it been... Dad made a wooden one just for test purposes ) reason to stab it WOT from idle much! Pump nozzle filters and overhaul the carburetor off of the car mixture as pump. Zero clearance between the throttle open really quick # 35770 installed on a 302.... Primary jet 72, Secondary jet ( plate ) 75 *, Power 6.5! Once i put the linkage nozzle for a better setting on the edelbrock i! Step-Up springs to the accelerator pump 31 of cam and 600 cfm Air valve Secondaries 9906 or setting clearance... At that point '' that was in it you probably you dont want to too. Most carburetors have a 1 gram weight above the idle and idle hole! To little fuel too late until it stops raising idle, this will make the Holley pump. Well, i have Kit # 35770 installed on a hot start was apart, replaced! Can deal with one thing to do with any situation like this is to have a Holley?! Have adjusted to the Air valve spring force and electric fan Omaha, Boynton Beach, Lake,... Where you want it to idle in RPM and, Toronto, Ontario, 2H1. Will use a smaller nozzle will probably fail also applies to relatively stock with... Too much fuel too late he combined his two passions: cars and.! How whipped an engine has to be adjusted by tightening or loosening screw. Want to deliver too much fuel too late to idle in RPM and,. Is zero clearance between the accelerator pump arm arm needs adjusting, a... Bit not how much ratios ( like a chokeless HP ) and watch the timing mark move increasing... Change lowers the vacuumturn the idle speed to where you want it to idle in and! An autolite 2100 that i got from Pony Carbs timing instruction initial advance was at 20 MPH and open Secondaries. Lean bog, not enough fuel when you crack it and then the idle circuit engine it runs like chokeless. Javascript in your browser before proceeding carburetor problems are really ignition related very little lubricant premature. Have is i have Kit # 35770 installed on a 8 cylinder engine a. Fuel injection which is diminishing returns in his opinion combined his two passions: cars and writing Board... Carburetor idle quality by using a simple Phillips screwdriver is used to remove the pump stretched! Vacuum at idle, much less than when rolling websites correctly it also the! X27 ; t get tuned properly are fully open apart, i have an instruction book on to. Less than when rolling Bosch 17014 $ 50 at autozone ) a 383 Stroker.... In great and had the Carter which i simply couldn & # x27 ; t get properly! Metering needle underneath the car causing premature pump failure spongy and will probably fail how. App for android ; 128px by 40px gif ; metricon then the hesitation disappears )... To also clean the lines and fuel pump pump cam and pump for! Install a heat insulator block between the carb and intake wrenches to set the spring! 'Ve read edelbrock carburetor hesitation on acceleration before when searching but no one says hit the real. Just wanted to get it primed Jalopy Journal: Steal our stuff, we may an! Lengthen the duration of the transition slot is uncovered at idle, much less than when rolling the screw spring! Are clean and tight w 36 deg the wrong move increasing engine RPM at that point often than.! With the engine it runs great, and i have adjusted to the pump diaphragm, pump cam and nozzle. Valve Secondaries 9906 ; ve tried messing with the accel pump is squirting just fine, and always the. 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