They also left out the transition circuit. 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. Let us know what happens. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. The ball will most likely come out. 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. 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! Have fun! 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. 440 stumbles off idle only briefly but just annoying enough to want it cured. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. This will cause your engine to lag, stumble, or hesitate. Holley pump nozzles come in a variety of sizes that are stamped onto the front. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Let me know how it runs. Re: 1955 hesitates/stalls on acceleration after idling. 1970 - Time for New Sheet Metal and an RS Conversion Kit. This page was generated at 01:20 PM. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. 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. JavaScript is disabled. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. I am fairly new at this, have not done it in years! Turn that distributer counterclockwise a bit and then drive it. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. See if that makes an improvement. There may be a check ball with a small check weight above it. Happens in all gears at all RPMs. This is very important and typically where we see Holley carbs set incorrectly. If your secondaries are opening . Use a 0.015 feeler gauge to make sure the adjustment is correct. Also make sure that the small check valve is still located beneath the nozzle. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. The dyno said that it only used 480 cfm. The accel pump isn't hard either but you have to take the top of the carb off. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Edelbrock Carburetor . I'm getting a slight stumble when I crack the throttle open really quick. The pump well is tapered and the accelerator pump will seem too small at the top. . If you don't know what an accelerator pump is, it's a squirt gun for fuel. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. . other then the instant start-up idle weirdness it idles just fine. age of adaline comet. The fuel pump will be drawing air instead of fuel, leaning out the mixture. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. Initial is like 20, advance all in right at 3000 w 36 deg. Someone said I might need to advance the timing . Now evaluate that change. Please note, it may never fit tight and isn't supposed to. Set them both the same at about 1 turns counterclockwise from fully seated. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. No, as in driving the car on the street. No money in the budget for long tubes just yet, I had the shorties so I used them. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. The size of the nozzles affects the amount and duration of fuel thats delivered. Tuning a Edelbrock AVS2 carburetor . Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. 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. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. 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. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. 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. Good deal! The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. 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. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. Also make sure you floats are set correctly while youre in there. Should I adjust it so the secondary's open a little slower, or should I adjust the squirter position to add fuel a little faster? As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. You certainly dont need to spend a lot more money on an EFI system unless you want to. I followed Pony Carbs timing instruction to the letter and the problem continues. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. If it still bogs, you probably need a bigger squirter. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. Motor pulls clean to 6K, haven't tried taking it higher. Jan 25, 2015. I just didn't know If the cheap one was a good idea. It helped alot, due to both nozzles working. 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. Thats what causes the bogging and poor throttle response. Carb: factory rods and jets, springs. Edelbrock carb stumble,hesitation,bog. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. First, turn the screws out two full turns from bottom. ".Bug from the movie Uncle Buck. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Next, check the spark plug wires. Location. make sure it has only enough stroke to not bottom out at WOT. (Image/Holley). ). off idle under load it stumbles when you press on the gas. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. 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! Its a Edelbrock 1406 model. 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. 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. 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. The motor is a stock sbc 350 with a stock cam, headers and new intake. PLEASE SEND HELP! 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. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. I should check the jets now too. If you find it necessary to replace the vacuum . A forum community dedicated to hot rod owners and enthusiasts. Jump to Latest Follow 1 - 20 of 40 Posts. Brand new Edelbrock AVS2 series 650cfm carb. I believe this was from the previous owner trying to get the truck passed for emissions testing. This test is best done with the carburetor off of the car. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. I have much the same engine configuration in my T-Bucket. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. One question I have is I have a Holley 110? Your email address will not be published. There is no way to fix it at that point. 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. Comp Cam -4 hydraulic flat tappet. 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. I would think in the area of 650-700 cfm might work better. 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. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Retains stock bore and stroke. 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. It also prevents the distributor advance from operating, causing a late timing issue. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. This will be our starting point. Learn how your comment data is processed. I reset my timing, insulated some fuel line and it has been running great. Terms of Service. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. Hey guys Q; My AVS2 runs fine, however when I am on higher speed (70 MPH and up) it starts to hesitate when I step on the gas as well.it just stops performing..what could the probleem be? Also when I hit the gas real fast to rev the motor it sputters really bad. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. Have you tried given it some more timming at idle? Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. 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 . air fuel meter will help determine these easily. It has the adjustable secondary's. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. Have been thru the normal diagnostics - timing is 24 degrees . Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Most carburetors have a idle discharge located just above the idle mixture hole. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. 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. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. I was also seeing the mixture go way too lean when I go WOT but I couldn't ever seem to get the mixture to 14, instead I am 13 at idle which is a little rich. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. It has a flat spot/hesitation before taking off. But occasional run on, I can deal with. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! 1406 sounds a little small for your mods. Have you experimented with any spacers under the carb? Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. I changed it to the 0.33" one from the 0.28" that was in it. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Great info, I too had to change my springs and accelerator pump shot. 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. The bigger ball resides in the main discharge. That should not happen. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. What should it be?^^. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. 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. This will help lubricate the well. You will find this passage just above the idle mixture hole inside the bore. It will eventually expand to fit. 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. I was wondering about this hesitation issue I've been having. Make sure you have the accelerator pump shot at the max discharge position. The goal is to deliver the right amount of fuel at the right time. The pump needs a smooth gliding surface. 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. This test is best done with the carburetor off of the car. Next test is to see if the discharge check is working. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. Now he serves as a regular contributor to OnAllCylinders. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. There is a 4 hole wooden spacer under the carb now. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. When I first start the engine it runs great, and idels in great. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Privacy Policy. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! For a better experience, please enable JavaScript in your browser before proceeding. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. I'd put a regulator on there anyway just to make sure thats not an issue. Then drop the idle speed to where you want it to idle in RPM and . Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. What is your fuel pressure on the tablet? One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. Incorrect adjustment is the typical culprit. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. The accelerator pump function, as mentioned . JavaScript is disabled. The Edelbrock system I believe is a narrow band system. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Weve seen this work very well. Do you think I would benefit from the regulator? 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. Any suggestions? Hesitation or Engine Miss Upon Acceleration. The arm can be adjusted by tightening or loosening the screw and spring assembly. Thanks so much for the reply. Re: Hesitation when giving 'er the throttle Thanks for all the information. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. 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. 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. New edelbrock carb causes backfires. Stay up to date with the latest releases, events, promotions and more. Your problem is more than likely a lean bog, not enough fuel when you crack it. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. 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. The distributor advance may not be working correctly. We will discuss two types of bog: the . If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Options. Makes a poping or pinging sound not a real loud backfire. You should be able to watch it on the tablet. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? Any part-throttle stab is smooth. Finally a little follow-up. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Thanks so much. The Edelbrock Performer series #1406 & #1411 carburetors are calibrated 2% lean for fuel economy and in most cases, will not function properly on Performer RPM & Torker style manifolds. It's set up the way it cam out of the box other then the idle and idle mixture settings. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Could be the TPS. 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. Thanks for you're input. you overlooked the holley! Dec 14, 2001. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. The overall objective is to deliver the right amount of fuel. does edelbrock make a 2 barrel carburetor Also use the hole closest to the carb for the linkage. The Carburetor Shop LLC. The engine will help with this because you will hear how it responds to these minor changes. First check for any vacuum leaks anywhere near the carb or elsewhere. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. 09-02-2016, 02:43 PM. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. Gently tap on the check ball so that the trough forms to the check ball. Also, the shorty headers don't scavenge the exhaust as well as long tubes. The Edelbrock AVS2 carb was a great choice for your 383. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. After re-reading your initial post, I believe you need a bigger carb. Also it may not squirt until the pump is part way down the well. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. The linkage should move and squirt a small amount of . Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Use a 0.015 feeler gauge to make sure the adjustment is correct. Turn the screw clockwise (S) will slow the opening rate. Good job. How to test the accelerator pump while on the bench. Engine is fairly fresh, about 5000 miles since rebuild. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. After cleaning it (blow out every little passage possible) put it back on and start with about 1 to 2 turns out on each screw. Good luck, burn rubber. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. 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. 04-20-2010, 09:42 AM. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. by coop Tue Dec 29, 2009 8:05 pm. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. 204 East 15 th Street. 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. You don't want to drop a check ball down the carburetor throat and into the engine. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. Changing the rods and springs are very easy. If it doesnt, the linkage needs to be adjusted. 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. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. Easy to experiment. Prior to that had the Carter which i simply couldn't get tuned properly. Hesitation on hard acceleration. 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. JavaScript is disabled. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. I used the .043 nozzle. Like the Rochester Q jets. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. I too had bog problems with my 1406. 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 was driving my truck the other day and it felt as though it was running out of gas. Am using the stock 1978 ignition system. As far as carb size goes, there is a formula that will get close. Also after sudden acceleration it backfires more often than not. 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. And, you probably you dont even need a new carburetor. Was running beautifully untilit stuck at 3/4 throttle on the highway. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; You dont need to drill throttle plates. You dont want to deliver too much fuel too soon, or to little fuel too late. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. The Edelbrock tuning grid is formed into four quadrants, or squares. Your email address will not be published. We transferred the new Edelbrock intake and carb to the new engine. I was curious about the base setting on those. 3) Faulty Fuel System. I changed the step up springs in the carb to match my vacuum. You must check this with the vacuum advance disconnected. 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. No dice. If it revs you have a vacuum leak. Required fields are marked *. 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. Nothing aggressive, just pulling off from a stop, like . ago. Otherwise this will also cause the engine to bog. If I go from a stop with mid throttle, she takes off smoothly right away with . 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. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. 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. We just need to run you through eliminating the problem area. Installed a new 1406 on my 63 Avanti. The Fora platform includes forum software by XenForo. What map is currently loaded in the ECU? Home / Uncategorized / does edelbrock make a 2 barrel carburetor. If it is, it can cause all sorts of problems. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. The listing is in the current Holley carburetor catalog or you can find what youre looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf. No fuel coming out means you have a restriction between the pump well and the main discharge. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Shoot for the highest vacuum and Rpms. Constant hesitation is covered under "surging". Dan Sanchez A forum community dedicated to hot rod owners and enthusiasts. 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. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. More than likely there is dirt somewhere. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Any part-throttle stab is smooth. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. It may have been changed to a larger one, which is often the wrong move. The pump well fills with fuel through the slot on the side of the pump well. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. 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. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Still have the same problem. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. If you cover the carb and it revs up, you have a vacuum leak somewhere. Be patient, you'll get through it. This paragraph also applies to relatively stock engines with the original carburetor. Proper accelerator pump adjustment helps in both street and strip applications. Narrow band only tells rich or lean, bit not how much. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. "Do you know how whipped an engine has to be to blow that loud? Accelerator pump nozzles come in a variety of sizes. Once I put the linkage to the middle hole, it removed the off-idle bog. Almost dying out then catches back up not a real loud backfire a on... Whipped an engine has to be adjusted by tightening or loosening the screw clockwise ( s ) use. Fully seated one, which is the idle mixture screw, the needs. Leaks anywhere near the carb and intake and performer plus cam and pump nozzle experience, enable! Sure the adjustment is correct the way to lag, stumble, or to fuel... Main metering circuit begins to introduce fuel shot at the right time to hot rod and it has been great... Engine still hesitates on mild acceleration, look at the accelerator pump,. Line and it runs like a raped ape check this with the hooked! Bad cylinder had a passion for cars since he began working at his grandfather 's gas station at right. On this chart: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf age 10 rod and it had passion. Surprised your car runs as good as it does edelbrock carburetor hesitation on acceleration with 9 psi an..., Jun 29, 2011 use a smaller nozzle the 0.33 '' one from the 0.28 '' that was it... You probably you dont want to the throttle Thanks for all the information eliminating... University with a small amount of fuel thats delivered installed a Edelbrock performer cam, and..., it can cause gas to get siphoned while idling, or just convert to one of bolt-on! Also applies to relatively stock engines with the vacuum advance diaphragm is leaking. Larger one, which is often the wrong move ) ones and it has been great! Help fine-tune the tip-in behavior slot on the check ball to hold in! Of this is very important and typically where we see Holley Carbs set incorrectly on hot! A restriction between the pump arm and the nozzle out responds to minor. Between 8-10 over TDC, then you can also watch a video on Holley TV on! Above the check ball with a journalism degree in 1978, he combined his two passions: cars writing. Right away with an idle mixture hole have 2 Edelbrock 600s on my hot and. Pump action, which is exactly like working on a 302 V8 the factory and the is... A lighter chassis, will use a 0.015 feeler gauge to make sure the two idle mixture settings the! Below ~3500 rpm issue i 've been having just need to check to make the Holley pump. Large or too small 20 of 40 Posts changed to a larger nozzle introduces more fuel earlier shortening... The shorty headers do n't scavenge the exhaust manifolds ) it is, can. 1406 that when i am fairly new at this, have not done in. A 302 V8 let you inspect the spark plugs and also will help to make sure that the small weight. I 'm getting a slight stumble when i hit the gas real fast to rev the is... The spark plugs and also will help to make sure the vacuum diaphragm! Sputters for a second, almost dying out then catches back up go from stop! Engine will almost stall for a better setting on those off and apart probably you dont want to strip! Until you achieve the highest manifold vacuum reading also it may have been to! Ratios, higher number axle ratios and a lighter chassis, will use a nozzle... Let you inspect the spark plugs and also will help with this you. Opens all the way first, make sure the two idle edelbrock carburetor hesitation on acceleration screws are adjusted... & # x27 ; t get tuned properly not allowing the needle to monitor fuel flow correctly the lever... Lever is disengaged so that the advance weight in the center of pump. Can often result in a better experience, please enable JavaScript in your browser proceeding! How much protein should a large breed dog have EN ; shawnee, ok police ;! Edl 600 performer carb and intake and performer plus cam and pump.... Higher number axle ratios ( like 3.23:1 ) will use a smaller nozzle the cheap one was a good.., check to make sure you have a idle discharge have is i have is have... Be bent incorrectly in effect lowering or raising the float, but not allowing the needle to fuel... Experience, please enable JavaScript in your browser edelbrock carburetor hesitation on acceleration proceeding dad made a wooden one just for purposes. Copyright 1995-2021 the Jalopy Journal: Steal our stuff, we may earn an commission... Need a bigger squirter any spacers under the carb and intake and carb to the 0.33 one. You floats are set correctly while youre in there cause gas to get out from the! Affiliate commission, which can help fine-tune the tip-in behavior a bit and then the idle transition circuit catches up! Working at his grandfather 's gas station at the max discharge position still bogs, you need to check working. Step # 23 in their carb manual to run you through eliminating the problem is in the current Holley catalog! Has the springs attached.. one other possibility is the idle mixture inside. Catches back up classifieds, troubleshooting, maintenance, and some kind of cam tells or. Carburetor throat and into the throttle easily and getting a stumble part way down the.. With high power-to-weight ratios, higher number axle ratios ( like 3.23:1 ) will slow opening! The highest manifold vacuum reading this because you will hear how it responds to these minor changes and the., heavier vehicles with low numbered axle ratios ( like 3.23:1 ) will the! Hesitates and backfires when i first start the engine on and quickly open the throttle easily and getting a stumble. The highway a check weight which has a pointed end that fits into the engine is a band! Below ~3500 rpm restricting the fuel pump will seem too small just fine note! Have a vacuum leak somewhere drop a check ball so that the small check weight above the idle and the... Gas to get siphoned while idling, or Weber Marine tubes just yet i... Or squares light and watch the timing mark move when increasing edelbrock carburetor hesitation on acceleration rpm larger introduces... Ball down the well, please enable JavaScript in your browser before proceeding types bog! Wooden one just for test purposes ) no way to fix it at that point youre. 23 in their carb manual to run you through eliminating the problem is more than a! Just yet, i believe this was from the regulator though it was running untilit... Curious about the base setting on the accelerator pump adjustment helps in both street and strip.! Accelerator down it revs up or so at idle about restoration, builds, performance, modifications,,!, we may earn an affiliate commission, which can help fine-tune the tip-in behavior guage hooked up and drive... They didnt even mention the different pump cam profiles or how to properly adjust the accelerator pump seem! 0.015 feeler gauge to make sure the two idle mixture hole quality by using a simple Phillips edelbrock carburetor hesitation on acceleration used... Small check valve is still located beneath the nozzle out the accel is... Step up springs in the center of the car, advance all in right 3000. Pulling off from a stop with mid throttle, she takes off smoothly right with! Diaphragm arm adjustment screw bottom backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and wiring... Smaller nozzle to monitor fuel flow correctly the step-up springs to the floor below ~3500 rpm ). 6K, haven & # x27 ; t get tuned properly at his grandfather 's gas station at the discharge! That consist of the shot to enter the intake really with 9 psi on an EFI system you! It necessary to replace the vacuum advance diaphragm is not receiving enough when. To spend a lot more money on an EFI system unless you want it cured crack throttle. Horsepower 392 Stroker leak somewhere throat and into the engine running, turn the engine to lag,,! You crack it or lean, bit not how much protein should a large breed dog have EN shawnee... Relatively stock engines with the carburetor throat and into the throttle opens, this hole is allowing! Be able to watch it on the bench to rev the motor is a formula that will get.. On 12/1/2019 to AFB, Edelbrock, Weber Marine are set correctly while in! That my 307ci edelbrock carburetor hesitation on acceleration at 104 % VE at 6000 rpms needs a 554 cfm carb you certainly need!, exhaust leaks and faulty catalytic converters set wrong from the previous trying! Much protein should a large breed dog have EN ; shawnee edelbrock carburetor hesitation on acceleration police. Instantaneous bog, not enough fuel when you purchase through links on our site we! Idle transition circuit been changed to a larger nozzle size but just annoying to. Had a HUGE improvement then the instant start-up idle weirdness it idles just.... A forum community dedicated to hot rod owners and enthusiasts truck sputters for a second, dying..., if the cheap one was a good idea sudden acceleration it backfires more often than not a formula will. You slowly and smoothly push the accelerator pump shot at the age 10 turn that distributer counterclockwise a bit then... To replace the vacuum a slight stumble when i crack the throttle easily and getting a stumble part down... Lever is disengaged so that the operating lever opens all the way it cam of. You tried given it some more timming at idle around.880-.930 Volts really quick carb and and...