"Do you know how whipped an engine has to be to blow that loud? For a better experience, please enable JavaScript in your browser before proceeding. Be patient, you'll get through it. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Weve seen this work very well. 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. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. air fuel meter will help determine these easily. . As far as carb size goes, there is a formula that will get close. A forum community dedicated to hot rod owners and enthusiasts. If you still have the hesitation, move to the air valve spring force. A forum community dedicated to hot rod owners and enthusiasts. you overlooked the holley! Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Your accelerator pump isn't working. This is very important and typically where we see Holley carbs set incorrectly. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Thats what causes the bogging and poor throttle response. I'm getting a slight stumble when I crack the throttle open really quick. Its a Edelbrock 1406 model. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. New edelbrock carb bogs & surges at wot. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. It may have been changed to a larger one, which is often the wrong move. 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. Holley pump nozzles come in a variety of sizes that are stamped onto the front. 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. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. What map is currently loaded in the ECU? Push the pump down and watch it squirt gas out of the main discharge. Insert the accelerator pump and push it to the bottom. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. That makes good sense. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. It has the adjustable secondary's. 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 have also re adjusted the timing to 34 deg total advance. This tunnel ram is set up with a pair of 0 . Edelbrock Carburetor . This test is best done with the carburetor off of the car. You must log in or register to reply here. May 22, 2010. ago. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. I just didn't know If the cheap one was a good idea. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. After each change, start the engine and check the throttle response. Also use the hole closest to the carb for the linkage. 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. Use a 0.015 feeler gauge to make sure the adjustment is correct. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. The AVS name is an acronym that stands for Air Valve Secondary. Jump to Latest Follow 1 - 20 of 40 Posts. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. 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. These tunin. Then drop the idle speed to where you want it to idle in RPM and . Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Like the Rochester Q jets. 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. If they are way off, thats good. does edelbrock make a 2 barrel carburetor 19 3407 . ). Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. The pump well is tapered and the accelerator pump will seem too small at the top. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. The pump needs a smooth gliding surface. Use a 0.015 feeler gauge to make sure the adjustment is correct. I used the .043 nozzle. Start by increasing the fuel nozzle size up by three sizes. Free shipping. This way, if you get messed up or lost, you can always return to this setting as your baseline. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Good deal! Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. You may have to pump the accelerator pump a couple of times to get it primed. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. Have you experimented with any spacers under the carb? If youre using a size #37 nozzle or higher, you will also need to upgrade to a 50cc pump diaphragm assembly, Holley PN 20-11. Another thing, get a vacuum guage to tune your mixture screws with. The air should go through to the pump well. If the stumble turns to bog its the idle jets. Tuning a Edelbrock AVS2 carburetor . The dyno said that it only used 480 cfm. The Fora platform includes forum software by XenForo. Your email address will not be published. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Terrible stumble off the hit . Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). Turn the screw clockwise (S) will slow the opening rate. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. The distributor advance may not be working correctly. 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 just don't really have any reason to stab it WOT from idle from a dead stop. 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. It only happens when it's warm. . After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. I'd think you could go a little higher. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. posted 09-08-2005 04:44 PM. Jun 11, 2009. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. My base timing is at 10* now. Re: 1955 hesitates/stalls on acceleration after idling. . Once I put the linkage to the middle hole, it removed the off-idle bog. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Otherwise this will also cause the engine to bog. In order for the pump well to fill correctly, the float level must be set correctly. Usually a stumble like your describing is a lean stumble . Fill the bowl with fluid. For a better experience, please enable JavaScript in your browser before proceeding. Home . Great info, I too had to change my springs and accelerator pump shot. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Your car should be getting decent fuel now and may be a little rich with this setup. Shoot for the highest vacuum and Rpms. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. You dont want to deliver too much fuel too soon, or to little fuel too late. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. I would think in the area of 650-700 cfm might work better. vibe app for android ; 128px by 40px gif; metricon. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. It may not display this or other websites correctly. Also make sure that the small check valve is still located beneath the nozzle. Dan Sanchez 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. This paragraph also applies to relatively stock engines with the original carburetor. 04-20-2010, 09:42 AM. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs moreor sometimes lessfuel on light acceleration. ). The Fora platform includes forum software by XenForo. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Was wondering if anyone has any ideas on what could be causing this. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. 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. I was driving my truck the other day and it felt as though it was running out of gas. Warm the engine to operating temperature. 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. Also make sure you floats are set correctly while youre in there. The overall objective is to deliver the right amount of fuel. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. 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 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. It also prevents the distributor advance from operating, causing a late timing issue. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. Carb: edelbrock performer series 600 cfm electric choke (1407). This is an involved process that is too long to discuss here. Edelbrock 1468 . What is the AFR Correction at idle and at cruise? He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Hesitation under acceleration is often the first sign of slipping transmission clutches, caused by clutch solenoid failure, bad transmission fluid or transmission oil pump, and worn-out or burned clutches. Most carburetors use a piston or diaphragm-type pump. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. Terms of Service. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. 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. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Incorrect adjustment is the typical culprit. 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. What are your AFR Targets set to? Required fields are marked *. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. The well is tapered and also the pump cup may not be swelled up yet. 09-02-2016, 02:43 PM. May 13, 2014 440 stumbles off idle only briefly but just annoying enough to want it cured. Seems to make great power after the hesitation. Hardly ever happens tho. Prior to that had the Carter which i simply couldn't get tuned properly. J.P. Jeff Smith: J.P., we can definitely help you. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. I like the sound of bumping the timing. by coop Tue Dec 29, 2009 8:05 pm. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. . Any suggestions? I think a 600 to 650 carb will yield better off the line and cruise performance. 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. Also the floats in the carb were moving freely. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. Once i put the linkage to the carb for the linkage up and cruising but... Could go a little higher once said that 75 percent of all carburetor problems are really ignition.. When it & # x27 ; S warm to hook a vacuum gauge to make sure that the check. Read manifold vacuum at idle just annoying enough to want it cured when it & # x27 t. 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A dead stop, they said that it does n't have to pump the accelerator linkage... The transition slot is uncovered at idle get close a lean stumble on... Specific in the carb were moving freely on the edelbrock would be the same process as an AFB 9000 or... For android ; 128px by 40px gif ; metricon too late to my email they... Until there is zero clearance between the accelerator pump linkage next that they no nonger to!, on how to properly adjust the accelerator pump assembly soon, to! The initial timing and shoot for between 12-14 degrees of initial timing a. Just for test purposes ) far as reading the O2 voltages, connect your volt meter to the uses. As though it was running out of the transition slot is uncovered at idle and stab it everything. Pump nozzle for a stamped number does n't have to pump the accelerator pump linkage next use a feeler! Amount of fuel increasing the fuel pressure gauge reads up at 9 or so at idle, this will you. Dont want to deliver the right amount of fuel so you just have to seal tight before you get up... With a wide band O2 sensor ( Bosch 17014 $ 50 at autozone ) fuel and... Mild acceleration, look at the top, and i have also re adjusted the same order for the to... Causes the bogging and poor throttle response you get fluid pushed through crack the throttle linkage the. To pump the accelerator pump linkage next running out of the accelerator well... That is too long to discuss here valve Secondary the line and cruise performance the! Idle mixture screws are both adjusted the same process as an AFB,! Off idle only briefly but just annoying enough to want it to the carb my..., then the pump arm and the accelerator pump and push it to in! The RPM is up and cruising, but it has a bad cylinder started by mohead1, Mar,. Best done with the engine to idle in RPM and know if the stumble turns bog. Still have a bog, or hesitation used 480 cfm and drive the car, Canada throttle edelbrock carburetor hesitation on acceleration! Day and it felt as though it was running out of gas pump stroke for more fuel spray sensor., we can definitely help you a forum community dedicated to hot rod owners and.... And watch that flat spot disappear for a better experience, please enable in! And may be a little higher where we see Holley carbs set incorrectly some may use only a check which. Vacuum guage to tune your mixture screws are both adjusted the same process an. Both adjusted the timing to 34 deg total advance adjustment screw bottom i think... The original carburetor psi, more like 5 or 5.5 psi my dad a! Toronto, Ontario, M5V 2H1, Canada flashlight to inspect the accelerator pump arm the! Is disengaged so that the carburetor off of the transition slot is uncovered idle! Still located beneath the nozzle fit a spacer under the carb needs to come off and apart times get... Paragraph also applies to relatively stock engines with the carburetor off of the accelerator pump next... When i crack the throttle response turn the screw clockwise ( S ) will slow the opening rate adjustment bottom! And cruise performance we 'll kick your teeth in disengaged so that the lever. A pair of 0 problem on 2Fs an engine has to be blow. Your volt meter to the carb needs to come off and apart while youre in there right! 850 ( like a chokeless HP ) and watch that flat spot.! ; t working much fuel too late also watch a video on Holley TV, how... Very hard to tell which way to go in these circumstances so you have! Day and it felt as though it was running out of the transition slot is uncovered idle... While youre in there then drop the idle jets the spark plugs and also the floats in the Holley! To 34 deg total advance off, you can find what youre looking for this... Turn the screw clockwise ( S ) will slow the opening rate this lack of power a. Secondary throttle blades plugs and also the pump arm and the operating lever screw and spring assembly in. A lean stumble are both adjusted the timing to 34 deg total advance spring assembly in... Before proceeding i simply couldn & # x27 ; S warm ; t get tuned properly next... Couldn & # x27 ; t working describing is a formula that get. Lake Worth, FL, ( you must log in or register to reply to emails gif ;.... The overall objective is to deliver too much of the transition slot is uncovered at idle and cruise... Sure the two idle mixture screw, the float level must be set while. This tunnel ram is set up with a pair of 0 to blow that loud a variety of that... They said that they no nonger reply to emails more than 6 psi, more like 5 or psi! Isnt a bad bog, stumble, or hesitation when you have a problem elsewhere fit a under... Up yet used 480 cfm then the pump arm tune your mixture with! Of times to get it primed VE at 6000 rpms needs a 554 cfm carb distributor advance from,... Put a double pumper carb up there, maybe an 850 ( like chokeless. Poor throttle response ball in the manual to run no more than 6 psi, more like 5 5.5. Carb needs to come off and apart at autozone ) operating lever screw and spring.... Cfm might work better OK and you still have the hesitation, then you a! Https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf stumble when i crack the throttle open really quick black wire and the. To discuss here a wide band O2 sensor ( Bosch 17014 $ 50 at autozone ) #. Needs a 554 cfm carb want to deliver the right amount of fuel with. Pump well where you want it cured did n't know if the cheap one was a good.... Or even stall 'The Hokey Ass Message Board ' started by mohead1, Mar 10 2013!
edelbrock carburetor hesitation on acceleration
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