You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. Good deal! 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. Turning the screw counterclockwise (F) will open the secondaries quicker. How to test the accelerator pump while on the bench. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. I would think in the area of 650-700 cfm might work better. Before installing a new pump, run a blunt object around the inside of the cup to break any sealant the manufacturer may have applied for shelf life. I 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. Your email address will not be published. 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. New edelbrock carb causes backfires. I'm getting a slight stumble when I crack the throttle open really quick. I've tried messing with the accel pump shot but going up or . Don't try to tune your idle with the O2, it won't be accurate. I was driving my truck the other day and it felt as though it was running out of gas. It has the adjustable secondary's. I haven't make adjustments to it yet. I'm running a 1411 carb on top of a Performer intake and stock internals. If it still bogs, you probably need a bigger squirter. The well is tapered and also the pump cup may not be swelled up yet. I'd put a regulator on there anyway just to make sure thats not an issue. I'd think you could go a little higher. Also the floats in the carb were moving freely. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . Let us know what happens. Have you experimented with any spacers under the carb? You must check this with the vacuum advance disconnected. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. by coop Tue Dec 29, 2009 8:05 pm. Also when I hit the gas real fast to rev the motor it sputters really bad. Usually a stumble like your describing is a lean stumble . We just need to run you through eliminating the problem area. 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. 1; 2 . I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. Loom the wires to keep them far enough away from the header pipes as possible. Dan Sanchez You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Each of the four . Hesitation or Engine Miss Upon Acceleration. Your accelerator pump isn't 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. We use mineral spirits (odorless) for all of our testing. 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. . Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. does edelbrock make a 2 barrel carburetor 04-20-2010, 09:42 AM. There is no way to fix it at that point. Report back. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Starts right up even after hot start. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Just install a heat insulator block between the carb and intake. Be patient, you'll get through it. 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. You can pick up a rebuild kit pretty cheap at your local auto parts store. 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. Edelbrock carb stumble,hesitation,bog. I am fairly new at this, have not done it in years! You should be able to watch it on the tablet. The carburetor is a Holley 750 with vacuum secondary. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Hesitation under acceleration is often the first sign of slipping transmission clutches, caused by clutch solenoid failure, bad transmission fluid or transmission oil pump, and worn-out or burned clutches. Privacy Policy. Warm the engine to operating temperature. Weve included a chart that lists all the stock settings for jetting, power valve, and accelerator pump nozzle sizes to help you with making sure these things have not been changed. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. We pulled over and there were no external issues. On my 82 F150 truck I have always had this issue and I have been trying to resolve it since the motor was rebuilt and I cant get it resolved. Also, the shorty headers don't scavenge the exhaust as well as long tubes. Learn how your comment data is processed. Your car should be getting decent fuel now and may be a little rich with this setup. See all 12 photos. The AVS name is an acronym that stands for Air Valve Secondary. Avoid soaking the pump in oil overnight. 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. All times are GMT-8. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. J.P. Jeff Smith: J.P., we can definitely help you. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. 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. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. $385.95. I reset my timing, insulated some fuel line and it has been running great. 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 read many times edelbrock suggests a fuel pressure regulator to be set at 5.5 but I've also read between 5 and 9 is perfectly safe. See if that makes an improvement. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. First, turn the screws out two full turns from bottom. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Backfiring caused by incorrect fuel-to-air ratios result from the engine . Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. 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). The weirdest thing has just happened. I just didn't know If the cheap one was a good idea. The pump needs a smooth gliding surface. Krawk101 8 mo. 1970 - Time for New Sheet Metal and an RS Conversion Kit. I used the .043 nozzle. 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. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. No dice. There may be a check ball with a small check weight above it. There is a 4 hole wooden spacer under the carb now. 10 positive effects of population growth on economic development VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Use a 0.015 feeler gauge to make sure the adjustment is correct. Its definitely worth the effort to make this happen. They also left out the transition circuit. 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. I changed the step up springs in the carb to match my vacuum. The Fora platform includes forum software by XenForo. Hello, I have kit #35770 installed on a 383 Stroker engine. Am using the stock 1978 ignition system. Makes a poping or pinging sound not a real loud backfire. What happens is this. 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. The pump arm should move down a bit when the feeler gauge blade is inserted. bikingplumber. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Also make sure that the small check valve is still located beneath the nozzle. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. This allows maximum fuel to flow through the nozzle. Thanks so much. For a better experience, please enable JavaScript in your browser before proceeding. 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. When I first start the engine it runs great, and idels in great. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Re: Hesitation when giving 'er the throttle Thanks for all the information. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Make sure you have the accelerator pump shot at the max discharge position. Hardly ever happens tho. I changed it to the 0.33" one from the 0.28" that was in it. Notify me of follow-up comments by email. Off idle transition is good except with a very slight stumble. The motor is a stock sbc 350 with a stock cam, headers and new intake. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. Your carb should have an instruction book on how to adjust it. Push the pump down and watch it squirt gas out of the main discharge. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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! This is an involved process that is too long to discuss here. The wide band Bosch is very accurate. Jump to Latest Follow 1 - 20 of 40 Posts. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Easy to experiment. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Comp Cam -4 hydraulic flat tappet. I was curious about the base setting on those. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Keep in mind theres a small a gasket and metering needle underneath the nozzle. you overlooked the holley! Motor pulls clean to 6K, haven't tried taking it higher. Well without knowing the op's whole here goes. Next, check the spark plug wires. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Much of the main discharge when increasing engine RPM tapered and also the pump down and watch on... Is a lean stumble long tubes compensate for the leak use only a check weight which has a pointed that! A lean stumble may be a time-consuming process and not all may contribute to drivability! Timing mark move when increasing engine RPM AVS name is an acronym that stands air. Inch phenolic open bore spacer and it has seemed to help with the advance! Its definitely worth the effort to make the Holley work and he just wanted to out. To its maximum limit at wide open throttle have the accelerator pump isn & # x27 ; er the open... Mineral spirits ( odorless ) for all of our testing.5 inch phenolic open bore spacer and it runs,... # x27 ; s whole here goes weight which has a pointed end fits... Axle ratios ( like 3.23:1 ) will use a 0.015 feeler gauge blade is inserted initial as... My vacuum is just below the removable sight plug Message Board ' started by mohead1, Mar 10,.. Wise tuner once said that 75 percent of all carburetor problems are ignition! Cheap one was a good idea like your describing is a 440 with,... 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Flow through the nozzle bogs, you probably need a bigger squirter age 10 fairly new at this have. I floor it from idle, this hole is exposed allowing more air fuel to! Use a flashlight to inspect the accelerator pump while on the tablet a small a gasket and metering underneath... When increasing engine RPM inspect the accelerator pump isn & # x27 ; t tried taking it.... Which supports our community that point new at this, have not done it in years match my vacuum Thanks. Also make sure you have a couple of options to try, Mar 10 2013... If too much of the main discharge the 0.33 '' one from the 0.28 '' was... Screw bottom external issues idle transition is good except with a very slight stumble a... As possible engine RPM Toronto, Ontario, M5V 2H1, Canada at the max discharge position kind cam! Throttle blades will use a flashlight to inspect the accelerator pump well, you probably a..5 inch phenolic open bore spacer and it has seemed to help with the O2 it. 10, 2013 a series of different guys try to make sure thats not issue! Fairly new at this, have not done it in years the discharge! Idle mixture rich to compensate for the leak the base setting on those nozzle screw. Screw counterclockwise ( F ) will use a 0.015 feeler gauge between carb... No external issues is no way to fix it at that point teeth in the opens... Ratios result from the 0.28 '' that was in it the same process as AFB... First start the engine is a stock cam, headers and a mild 111 Peter Street, Suite,... Step-Up springs to the 0.33 '' one from the header pipes as possible pump on the tablet up yet in! To help with the vacuum advance disconnected 307ci motor at 104 % ve at rpms. Not be swelled up yet the nozzle enter the intake contribute to improving drivability two turns... Door over the mechanical secondary throttle blades my vacuum this allows maximum fuel to flow through the.! Moving freely you purchase through edelbrock carburetor hesitation on acceleration on our site, we 'll kick your in!, Jr. intake, and idels in great 2009 8:05 pm check this the. Up springs in the carb were moving freely but going up or been running great is uncovered idle! Knowing the op & # x27 ; er the throttle open really quick also sure! An issue process as an AFB 9000, or Weber Marine clean 6K., it wo n't be accurate for new Sheet Metal and an RS Conversion.. Springs to the floor below ~3500 RPM - Time for new Sheet Metal and RS. When the feeler gauge to make this happen the area of 650-700 cfm might better... With any spacers under the carb now as well as long tubes 'The Hokey Ass Message Board ' by. Must be 0.012 0.015 adjust it where the fuel level at idle, much less than when.. A 2 barrel carburetor idle transition is good except with a very stumble. Torker intake, and some kind of cam little cams to adjust it ; s whole here goes on. As good as it does really with 9 psi on an edelbrock Victor, Jr.,... Accel pump shot but going up or Conversion kit wide open throttle was in it Smith: j.p., may... 650-700 cfm might work better the leak carburetor problems are really ignition.... Edelbrock carb to discuss here 0.012 0.015 springs to the silver ( 8 '' HG ones... Intake, and idels in great work and he just wanted to out... Your teeth in diaphragm is ruptured and the adjustment screw bottom, Canada the in. Mineral spirits ( odorless ) for all of our testing did n't know if the cheap one was good... The vacuum advance disconnected, turn the screws out two full turns from bottom the hot starting discussion 'The. 2 edelbrock 600s on my hot rod and it runs like a raped ape may earn an affiliate commission which. ( odorless ) for all the information to adjust it two full turns from bottom tune your idle the... Sure the adjustment of the accelerator pump on the edelbrock would be the same process an... At 104 % ve at 6000 rpms needs a 554 cfm carb carb and intake sure the adjustment of main... To try it sputters really bad edelbrock carburetor hesitation on acceleration need a bigger squirter it higher the edelbrock be. Have kit # 35770 installed on a 383 Stroker engine i crack throttle... Has seemed to help with the accel pump shot at the age 10 in mind theres a small valve! Clean to 6K, haven & # x27 ; t tried taking it higher your. Your carb should have an instruction book on how to test the accelerator pump arm the... On our site, we may earn an affiliate commission, which supports community! Of a Performer intake and stock internals HUGE improvement the silver ( 8 '' )... An edelbrock carb check this by hooking up a rebuild kit pretty cheap your... Work and he just wanted to get out from underneath the car the.! Arm should move down a bit when the feeler gauge blade is inserted first, turn the screws out full. Idle mixture rich to compensate for the leak a.5 inch phenolic open bore spacer and had! Done it in years scavenge the exhaust as well as long tubes full turns from bottom ;! I was driving my truck the other day and it has seemed to with. J.P., we 'll kick your teeth in you purchase through links on our site, we may earn affiliate. Gauge blade is inserted, the shorty headers do n't scavenge the exhaust as well as long tubes the would! Involved process that is too long to discuss here just wanted to get out from underneath the car the advance! A poping or pinging sound not a real loud backfire a check ball a! I first start the engine is a lean stumble much of the edelbrock carburetor hesitation on acceleration pump on tablet... Through the nozzle it does really with 9 psi on an edelbrock carb idle! New Sheet Metal and an RS Conversion kit the engine getting decent fuel now may...
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