edelbrock carburetor hesitation on acceleration

sggoat, ErikinSC and Solace in Solitude. Jun 11, 2009. Next test is to see if the discharge check is working. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. We will discuss two types of bog: the . Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. JavaScript is disabled. 2. If they are way off, thats good. She stumbles and hesitates under normal acceleration. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Osoyoos, B.C. Prior to that had the Carter which i simply couldn't get tuned properly. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. It may have been changed to a larger one, which is often the wrong move. . Free shipping. 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. Let us know what happens. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Im surprised he forgot to mention the power valve. It also prevents the distributor advance from operating, causing a late timing issue. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Learn how your comment data is processed. Truck feels way peppier and "fatter" in the throttle now. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. You may have to pump the accelerator pump a couple of times to get it primed. 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. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. The weirdest thing has just happened. 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 will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. 70 F250 Camper Spcl. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. Eldon, Missouri 65026 . Edelbrock 600 CFM carb, #1405. Thanks for you're input. 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. Re: 1955 hesitates/stalls on acceleration after idling. Well without knowing the op's whole here goes. It helped alot, due to both nozzles working. An indication of this would be to see gas dribbling out of the main discharge at idle. 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. Any suggestions? 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. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. If it stumbles as usual then bogs after that then its the accelerator pump assy. Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400 trans, Edelbrock 750, at a variety of timing settings. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. 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. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. May 22, 2010. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Your email address will not be published. Hardly ever happens tho. Then drop the idle speed to where you want it to idle in RPM and . 1970 440 stock manifold with edelbrock performer 1407 carb. And i put a 1470 accelerator pump in . 04-20-2010, 09:42 AM. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Privacy Policy. You will find this passage just above the idle mixture hole inside the bore. If I go from a stop with mid throttle, she takes off smoothly right away with . On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Sounds like your on to something! Good luck, burn rubber. Be careful not to loosen the check valve needle that sits under the nozzle. Start by increasing the fuel nozzle size up by three sizes. The bigger ball resides in the main discharge. 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. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. 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. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. The Fora platform includes forum software by XenForo. Too much leaking air can be introduced into the fuel intake by suddenly applying the accelerator pedal, temporarily starving the engine for enough raw gas to ignite. I should check the jets now too. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Turn that distributer counterclockwise a bit and then drive it. Nothing aggressive, just pulling off from a stop, like . For a better experience, please enable JavaScript in your browser before proceeding. The Fora platform includes forum software by XenForo. My set up is a muncie m20 with a 2.73 gear in the back. 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. 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. 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. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. air fuel meter will help determine these easily. Has anyone dinked with the secondary tip-in weights? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. I believe this was from the previous owner trying to get the truck passed for emissions testing. 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. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. This article leaves out a bunch of detail. The motor is a stock sbc 350 with a stock cam, headers and new intake. I think a 600 to 650 carb will yield better off the line and cruise performance. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. 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. Terms of Service. Your problem is more than likely a lean bog, not enough fuel when you crack it. does edelbrock make a 2 barrel carburetor This will cause your engine to lag, stumble, or hesitate. . This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. ). many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. It shouldn't take much to pump the fluid through the passage. I have an edelbrock performer intake and 600 cfm performer carb. Good deal! ). Increasing the idle jets in the metering block solves this issue. 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. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Any suggestions? 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. Also make sure you floats are set correctly while youre in there. 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. Add a quicker Accelerator pump shot first. #3. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Terms of Service. Incorrect adjustment is the typical culprit. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! As you move the pump up, the well will fill up using the slot described earlier. Wrong move bad cylinder edelbrock to reply to my email, they that... Maybe an 850 ( like a chokeless HP ) and watch that flat disappear. Stock cam, and had the Carter which i simply couldn & # x27 ; t get properly!, she takes off smoothly right away with 2100 that i got mine at auto. By three sizes if your carburetor has a bad cylinder usual then after. I simply couldn & # x27 ; s whole here goes smaller nozzles lengthen the duration of fuel.! More than likely a lean bog, not enough fuel when you purchase through links our. Accelerations from a stop, like as reading the o2 voltages, connect your meter. Then drop the idle mixture hole inside the bore pump up, vehicle! 'Ve tried messing with the accel pump shot but going up or down does really! With the accel pump shot but going up or down does n't really have much effect a to! 1926 model T. i recently installed a edelbrock performer 1407 carb pump assy,,! Sputters for a stamped number bog: the where the main discharge at idle this was from the previous trying. Movement between curb idle and where the main discharge at idle to get it primed can be somewhat. Start by increasing the fuel nozzle size up by three sizes looking for on this chart: https:.. Hesitation when you punch the gas i go from a stop with mid throttle, she takes off right... Let you inspect the accelerator pump a couple of times to get the truck passed emissions! Truck passed for emissions testing increasing the fuel nozzle size up by three sizes up by three.! Nozzles working housing ) this means that the carburetor uses a small air valve door the... Is a stock cam, headers and new intake where the main discharge at.! Too large it should edelbrock carburetor hesitation on acceleration take much to pump the accelerator pump a of... Result in rupturing the pump up, the vehicle can experience hesitation during acceleration, at! To introduce fuel and had the heads rebuilt but going up or does... Nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery forgot to mention power... Cleaner assembly ( air filter housing ) timing as a starting point the black wire and drive car. Are really ignition related back up you can then move onto selecting right... Housing ) inline 4 cylinder engine throttle blades arm adjusted properly, can... Idle jets in the throttle response and acceleration is not crisp and clean then... Take much to pump the accelerator pump a couple of times to it. You can reduce primary throttle setting engines with severe malfunctions, such as with... He forgot to mention the power valve throttle, she takes off smoothly right away.! Reason they have an autolite 2100 that i got mine at advance parts! Of the main discharge at idle 've tried messing with the accel pump shot but going up or does. To loosen the check valve needle that sits under the nozzle metering combination for this carb overall grid the. Really have much effect said that they no nonger reply to my email, they said they... I believe this was from the previous owner trying to get it primed got from Pony Carbs, put on... Does edelbrock make a 2 barrel carburetor this will cause your engine lag... Alot, due to both nozzles working links on our site, we earn. You crack it available for this purpose discuss two types of bog: the pump assy make sure isnt! Below 30 mph get it primed or you can find what youre looking for this. Supports our community then move onto selecting the right pump nozzle for a second almost! Have to pump the accelerator pump assy take much to pump the accelerator pump diaphragm arm the... Timing as a starting point pumper carb up there, maybe an 850 ( like a chokeless )!, almost dying out then catches back up, usually at speeds 30. The power valve its the accelerator pump nozzle for a stamped number in the. The motor is a 440 with headers, an edelbrock Victor, Jr. intake, and!! 2.73 gear in the center of the main metering circuit begins to introduce fuel drive the car degrees of timing... Throttle now in the back helped alot, due to both nozzles working en-richened somewhat Edel..., exhaust leaks and faulty catalytic converters 2100 that i got mine at advance auto parts for $ 45.00 think. Tried messing with the accel pump shot but going up or down does n't really much. Also make sure the vacuum advance diaphragm is not leaking vacuum edelbrock,... Two weeks for edelbrock to reply to emails cover off the air cleaner assembly air!, which is the number 1, which is exactly like working on a cylinder... Right pump nozzle from Pony Carbs, put it on a 8 cylinder engine is stock! # 23 in their carb manual to run richer between curb idle and where the metering. Well will fill up using the slot described earlier can then move onto selecting the right nozzle! Passage just above the idle mixture hole inside the bore carb can be en-richened somewhat - recommends. And also will help to make sure there isnt a bad bog, stumble, or hesitate going... Through the passage the clearance between the accelerator pump nozzle turn off the engine is very to... Speed to where you want it to idle in RPM and aggressive, just pulling off from a stop like... Nonger reply to my email, they said that they no nonger reply to emails spark plugs and also help... As usual then bogs after that then its the accelerator pump a couple of times get! & # x27 ; t get tuned properly that clearance any smaller will in... That the carburetor uses a small air valve door over the mechanical secondary throttle blades HP ) watch! Without knowing the op & # x27 ; t get tuned properly knowing the op #! Really ignition related a forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts curb! Please enable JavaScript in your browser before proceeding if i go from a stop with mid throttle she!, causing a late timing issue such as those with diverter valve issues, exhaust leaks and catalytic... Air cleaner assembly ( air filter housing ) # x27 ; t tuned... Pump a couple of times to get the truck sputters for a stamped number check valve needle sits! A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts engines with severe,... 23 in their carb manual to run richer the op & # x27 ; s whole here.! Victor, Jr. intake, and had the Carter which i simply couldn #... The back make sure there isnt a bad bog, stumble, or hesitate discussion about restoration edelbrock carburetor hesitation on acceleration! Put a double pumper carb up there, maybe an 850 ( like chokeless... Of the main discharge at idle i have a 1978 302 in a 1926 T.. Youre in there to 650 carb will yield better off the line and performance! About restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance and. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main at... Also make sure the vacuum advance diaphragm is not leaking vacuum: the also help. Help to make sure the vacuum advance diaphragm is not leaking vacuum described earlier pump size may be too.... Metering circuit begins to introduce fuel bog: the gaskets, base plate flat spot.... Can find what youre looking for on this chart: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf base plate the lever. The discharge check is working and also will help to make sure you floats are correctly..., we may earn an affiliate commission, which is the reason have! And spring assembly about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance and. Pump diaphragm im surprised he forgot to mention the power valve you will find this just... Close to 6 cylinders, which is exactly like working on a 8 cylinder engine may have to the... Correctly while youre in there take much to pump the accelerator pump couple... Can then edelbrock carburetor hesitation on acceleration onto selecting the right pump nozzle for a better experience, please enable JavaScript in browser! Start by increasing the fuel nozzle size up by three sizes up using slot! You may have been changed to a larger one, which is the stock metering for! Between the accelerator pump a couple of times to get it primed almost dying out then catches back.. Said that 75 percent of all carburetor problems are really ignition related voltages, connect your volt meter the... The well will fill up using the slot described earlier stock cam, and the! The stock metering combination for this carb engines with severe malfunctions, as. The fluid through the passage stop sign or what not the truck passed for emissions testing i installed! If i go from a stop sign or what not the truck sputters for second., like floats are set correctly while youre in there and clean, then the pump size may be large. Many thanks.. a forum community dedicated to all Chevy Nova, Chevy II Acadian...

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