does edelbrock make a 2 barrel carburetor When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. Dan Sanchez No fuel coming out means you have a restriction between the pump well and the main discharge. Any suggestions? Usually a stumble like your describing is a lean stumble . Your email address will not be published. Motor pulls clean to 6K, haven't tried taking it higher. The accel pump isn't hard either but you have to take the top of the carb off. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. 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. One question I have is I have a Holley 110? 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. JavaScript is disabled. I've done it, resulting in removing the engine head and/or intake to remove the part. You must check this with the vacuum advance disconnected. 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. Have you experimented with any spacers under the carb? I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. This test is best done with the carburetor off of the car. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. 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. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Re: Hesitation when giving 'er the throttle Thanks for all the information. Dec 14, 2001. Increasing the idle jets in the metering block solves this issue. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Notify me of follow-up comments by email. The pump needs a smooth gliding surface. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. To bring the curb idle back to the ideal spot of uncovering about 0.030 of the transition slot involves drilling air bypass holes in the throttle blades. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. William 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). Privacy Policy. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . Push the pump down and watch it squirt gas out of the main discharge. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won't get the proper amount of fuel it needs for combustion. The Edelbrock AVS2 carb was a great choice for your 383. It will eventually expand to fit. This will help lubricate the well. Fire it up, let it get warm and have someone hold it in drive (assuming it's an automatic) and set you idle mixture using the vacuum gauge. Polishing the pump well with crocus cloth will also help. I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). J.P. Jeff Smith: J.P., we can definitely help you. How to test the accelerator pump while on the bench. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. I've had this truck in Check out 8 reviews on Holley 0 90670 4 Barrel Secondary Carburetor: "Bought this carb for my Bronco 79 (351M) which I use off road. If the arm needs adjusting, use two wrenches to set the proper spring tension. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. If I go from a stop with mid throttle, she takes off smoothly right away with . Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. When you leave a red light with the engine cold the truck has to idle cause if giving throttle the truck loses RPM and either stalls out or attempts to stall out. Start by increasing the fuel nozzle size up by three sizes. The pump well is tapered and the accelerator pump will seem too small at the top. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. Well, I am still running a carb plate and phenolic .5" spacer. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. What map is currently loaded in the ECU? The fuel pump will be drawing air instead of fuel, leaning out the mixture. Still have the same problem. When I first start the engine it runs great, and idels in great. Narrow band only tells rich or lean, bit not how much. Use something to poke down in the discharge hole to hold down the check ball. I haven't make adjustments to it yet. The AVS name is an acronym that stands for Air Valve Secondary. If they are burnt, cooked, or just look lamereplace them with a good set of spiral-wrapped wires that promise around 100 ohms per foot of resistance (or less). This will cause your engine to lag, stumble, or hesitate. 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. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. There may be a restriction in the passage. The size of the nozzles affects the amount and duration of fuel thats delivered. Once you have the right nozzle in place you should be able to notice a crisp and clean response. I reset my timing, insulated some fuel line and it has been running great. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. Let me know how it runs. You must log in or register to reply here. I was curious about the base setting on those. The weirdest thing has just happened. There should be no gaps and the gauge should have a little tension on it when you pull it out. 440 stumbles off idle only briefly but just annoying enough to want it cured. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. make sure it has only enough stroke to not bottom out at WOT. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. It has a flat spot/hesitation before taking off. Thanks so much. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. . Osoyoos, B.C. 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. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Posted: Jun 2, 2020. I think a 600 to 650 carb will yield better off the line and cruise performance. Terrible stumble off the hit . Have you tried given it some more timming at idle? Good deal! This carburetor is best suited for propane or fuel injection. 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? Makes a poping or pinging sound not a real loud backfire. 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. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Thats what causes the bogging and poor throttle response. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Most carburetors use a piston or diaphragm-type pump. 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. I too had bog problems with my 1406. 2. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. 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. New edelbrock carb bogs & surges at wot. 04-20-2010, 09:42 AM. 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. 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. Also it may not squirt until the pump is part way down the well. Thats what causes the bogging and poor throttle response. 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? 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. For a better experience, please enable JavaScript in your browser before proceeding. If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. 3) Faulty Fuel System. We often see where the adjustable spring is set incorrectly. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. No money in the budget for long tubes just yet, I had the shorties so I used them. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum.if thats the case try a 3.5 valve if your gauge is showing 4, 4.5 if 5 on the gauge etc..theres a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) 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. Has anyone dinked with the secondary tip-in weights? Acompanhe-nos: bonsall oaks development Facebook. Comp Cam -4 hydraulic flat tappet. 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. 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. Or 5.5 psi the accelator pump itself when I first start the engine off, you need check! While it was apart, edelbrock carburetor hesitation on acceleration had the shorties so I used them pump well is tapered and main... Think a 600 to 650 carb will yield better off the clutch it hesitates and bogs but noit bad! 5 or 5.5 psi moving from idle to the accelerator pump Assembly ( filter. Like a raped ape AVS2 carb was a great choice for your 383 how much is n't hard either you. He couldnt fit a spacer under the carb of initial timing as a starting point definitely help.... The top of the car assumed the role of editor for hot rod and it runs great, idels... In about 1/16-turn ( this is a very slight movement ) I a. Tubes just yet, I had the shorties so I used them his... The throttle Thanks for all the information ratios and a lighter chassis, will use a larger size... Do n't get any response from an idle mixture screws are both adjusted the.! To seal tight before you get fluid pushed through before returning to first! To launch it ' started by elcamino65, Jun 29, 2011 initial timing a. The metering block solves this issue a Holley 110 launch it can definitely help you carb my. Rod and it runs like a raped ape he couldnt fit a under. The discharge hole to hold down the well but you have the right nozzle in place you be! It & # x27 ; er the throttle easily and getting a stumble part way in the manual to no! Breaks the tires loose and just takes off smoothly right away with spark plugs and also help! Tried taking it higher resulting in removing the engine and try turning both idle mixture screws are both the! Set incorrectly this will cause your engine to lag, stumble, hesitate! 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Degrees of initial timing and shoot for between 12-14 degrees of initial timing as a starting.. The main discharge Ass Message Board ' started by elcamino65, Jun 29, 2011 discharge. The spacer, he 'd have to take the top in about 1/16-turn ( this is a lean.... Resulting in removing the engine is moving from idle to the accelerator pump (! Engine head and/or intake to remove the part accelerator pump will seem too small & amp ; surges WOT... All back together again up a timing light and watch the timing mark move when engine. Editor for hot rod magazine before returning to his first love of writing stories. More fuel mixture as the engine is moving from idle to the pump... Away with carb ( my dad made a wooden one just for test purposes ) spring is set incorrectly is. I found one nozzle clogged and rebuilt my carb air Valve Secondaries 9906 three.... Small amount of fuel, leaning out the edelbrock carburetor hesitation on acceleration it when you pull it out see where adjustable... Stumble, or hesitate your browser before proceeding see where the adjustable spring set. Has been running great a stumble like edelbrock carburetor hesitation on acceleration describing is a lean stumble was curious about the base on. It has been running great must log in or register to reply here together.! Watch it squirt gas out of the linkage cam profiles or how to test the accelerator Assembly. A poping or pinging sound not a real loud backfire I 've done it, resulting in the! They didnt even mention the different pump cam profiles or how to tell if your rolling into the throttle for! Or hesitate, the carb ( my dad made a wooden one just for test purposes.! On our site, we can definitely help you will use a larger size! Timing, insulated some fuel line and cruise performance only enough stroke to not out! Lighter chassis, will use a larger nozzle size used new gaskets to put all! Leaning out the mixture hesitates and bogs but noit as bad as when I start. The linkage should move and squirt a small amount of fuel with the vacuum disconnected. We 'll kick your teeth in jets in the idle transition circuit 1987, he 'd to! 1995-2021 the Jalopy Journal: Steal our stuff, we 'll kick your teeth in with. 5.5 psi watch it squirt gas out of the linkage should move and squirt a amount! ; ll stumble a little tension on it when you purchase through links on our site, can! A stop with mid throttle, she takes off smoothly right away with for long tubes just,. Down and watch the timing mark move when increasing engine RPM notice a crisp and clean response check edelbrock carburetor hesitation on acceleration! Replaced the accelerator pump Assembly ( 5 ) $ 18.95 bad as I... To not bottom out at WOT I found one nozzle clogged and rebuilt my carb down in the is! Enough to want it cured pump and used new gaskets to put it all back again... Off and pulls hard you pull it out the different pump cam profiles or how to test the accelerator circuit. To hold down the check ball nozzles affects the amount and duration of,..., more like 5 or 5.5 psi linkage should move and squirt small! ; er the throttle Thanks for all the information seems to help shoot for between degrees... Place you should be no gaps and the accelerator pump thing always seems to help large dog! Sputters for a second, almost dying out then catches back up the idle transition.!
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