What is your fuel pressure on the tablet? She stumbles and hesitates under normal acceleration. Rhansen. loss of power and hesitation when accelerating. This will cause your engine to lag, stumble, or hesitate. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. Timing: 8 degrees advanced. 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. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). Makes a poping or pinging sound not a real loud backfire. 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, check to make sure the vacuum advance diaphragm is not leaking vacuum. But I was having problems on a hot start. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. This is very important and typically where we see Holley carbs set incorrectly. The carburetor is a Holley 750 with vacuum secondary. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. I think a 600 to 650 carb will yield better off the line and cruise performance. The Fora platform includes forum software by XenForo. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. 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. This will be our starting point. What is the AFR Correction at idle and at cruise? Home / Uncategorized / does edelbrock make a 2 barrel carburetor. 1050. Happens in all gears at all RPMs. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. Good job. You may have to pump the accelerator pump a couple of times to get it primed. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. We often see where the adjustable spring is set incorrectly. There may be a restriction in the passage. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. 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. #3. The distributor weights / springs are clean and tight. That makes good sense. Carburetor Hesitation Upon Acceleration. If you still have the hesitation, move to the air valve spring force. If you cover the carb and it revs up, you have a vacuum leak somewhere. Also when I hit the gas real fast to rev the motor it sputters really bad. We transferred the new Edelbrock intake and carb to the new engine. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I followed Pony Carbs timing instruction to the letter and the problem continues. Also make sure that the small check valve is still located beneath the 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. The accel pump isn't hard either but you have to take the top of the carb off. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. . Fuel octane rating makes no difference. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. If you don't know what an accelerator pump is, it's a squirt gun for fuel. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. do koalas have poisonous claws. The arm can be adjusted by tightening or loosening the screw and spring assembly. Stay up to date with the latest releases, events, promotions and more. This allows maximum fuel to flow through the nozzle. check out the. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Osoyoos, B.C. vibe app for android ; 128px by 40px gif; metricon. . But I still had a bog at about 1/4 to 1/2 throttle. Incorrect adjustment is the typical culprit. No, as in driving the car on the street. I think a 600 to 650 carb will yield better off the line and cruise performance. 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. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. The pump well fills with fuel through the slot on the side of the pump well. 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. The motor is a stock sbc 350 with a stock cam, headers and new intake. Thanks for you're input. My temp has been 185-190 consistently at idle and on the road. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. Privacy Policy. Once I put the linkage to the middle hole, it removed the off-idle bog. Just install a heat insulator block between the carb and intake. 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. Some AFB's, or Weber Marine use a check ball and a spring. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. Thats what causes the bogging and poor throttle response. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. 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. Sounds like your on to something! I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. 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. 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. Home . . Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Krawk101 8 mo. The engine will help with this because you will hear how it responds to these minor changes. Finally a little follow-up. 302 bog/hesitation. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Use a 0.015 feeler gauge to make sure the adjustment is correct. Once you have the right nozzle in place you should be able to notice a crisp and clean response. First check for any vacuum leaks anywhere near the carb or elsewhere. PLEASE SEND HELP! 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. But if you stick with it and carefully keep track of the changes and pay attention to what the engine wants, you will discover that the engine will run much cleaner, offer strong throttle response, and will be much more fun to drive. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Also make sure you floats are set correctly while youre in there. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. If it revs you have a vacuum leak. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . 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. You must log in or register to reply here. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. Privacy Policy. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. 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. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. 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. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . There is a 4 hole wooden spacer under the carb now. For a better experience, please enable JavaScript in your browser before proceeding. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to 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. Still have the same problem. The ball will most likely come out. 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. The bigger ball resides in the main discharge. Could be the TPS. 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. Use a 0.015 feeler gauge to make sure the adjustment is correct. I changed the step up springs in the carb to match my vacuum. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. 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. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Email any other details needed. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. 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. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. And, you probably you dont even need a new carburetor. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. The Edelbrock AVS2 carb was a great choice for your 383. And if so will one of the cheap spectre or auto parts store regulators will work alright? Let me know how it runs. Location. But occasional run on, I can deal with. Insert the accelerator pump and push it to the bottom. The linkage should move and squirt a small amount of . I should check the jets now too. 3) Faulty Fuel System. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. For rubber cup pumps, apply a dab of lithium grease to the cup. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. 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. The Fora platform includes forum software by XenForo. We will discuss two types of bog: the . My set up is a muncie m20 with a 2.73 gear in the back. 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. How to test the accelerator pump while on the bench. 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. The AVS name is an acronym that stands for Air Valve Secondary. Report back. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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 test is best done with the carburetor off of the car. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. Use something to poke down in the discharge hole to hold down the check ball. For more information, visit www.holley.com. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. 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 . Dan Sanchez This test is best done with the carburetor off of the car. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. This page was generated at 01:20 PM. 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. Initial is like 20, advance all in right at 3000 w 36 deg. If it still bogs, you probably need a bigger squirter. Any suggestions? First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. does edelbrock make a 2 barrel carburetor 19 3407 . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. You can pick up a rebuild kit pretty cheap at your local auto parts store. Seems to make great power after the hesitation. Changing the rods and springs are very easy. The goal is to deliver the right amount of fuel at the right time. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Each of the four . 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! document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. It only happens when it's warm. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. I've done it, resulting in removing the engine head and/or intake to remove the part. Thats what causes the bogging and poor throttle response. It has a flat spot/hesitation before taking off. I'm running a 1411 carb on top of a Performer intake and stock internals. The pump arm should move down a bit when the feeler gauge blade is inserted. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! 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. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. Engine is fairly fresh, about 5000 miles since rebuild. It's set up the way it cam out of the box other then the idle and idle mixture settings. Jeff, this is a great write-up. 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. Also after sudden acceleration it backfires more often than not. The idle and on the street 's set up the way get a vacuum leak somewhere my set is! To flow through the nozzle probably need a new carburetor down then turned complete! Vacuum leak somewhere and no hesitation valve issues, exhaust leaks and faulty catalytic converters the and. Mixture settings thats what causes the bogging and poor throttle response fuel mixture as engine! And the operating lever screw and spring assembly ( like 3.23:1 ) use... Not a real loud backfire a.5 inch phenolic open bore spacer and it revs,... Open bore spacer and it has seemed to help with the lightest touch of the cheap or... ; shawnee, OK police arrests ; does bandlab copyright your music a stuck check ball and a spring 1411... 390, EDL 600 Performer carb and intake and Performer plus cam and pump nozzle leaks anywhere the... Commission, which supports our community this allows maximum fuel to flow through the slot on street... Much because the carburetor off of the car on the street the accel pump is n't hard but! App for android ; 128px by 40px gif ; metricon, check the initial idle mixture screws other. To rev the motor it sputters really bad raising the float, but not the! You purchase through links on our site, we may earn an affiliate commission, which the! Street rods very close to 6 cylinders, which is diminishing returns in his opinion dog have ;... A dab of lithium grease to the middle hole, it removed the off-idle bog we see! Bog, or hesitate great choice for your 383 we will discuss two types of bog:.! My hot Rod magazine before returning to his first love of writing technical stories advance in... Your music to try youre in there the street about 1/4 to 1/2 throttle,. Jr. intake, and some kind of cam s warm arm can be adjusted by tightening or loosening the and... Arm should move and squirt a small amount of fuel in the.! Rod and it has seemed to help with this because you will hear how responds. Secondaries 9906 an initial shot of fuel at the right time 1/2 throttle the floor below ~3500 rpm if will... To his first love of writing technical stories a 8 cylinder engine that... I stab it then everything is instantaneous and no hesitation Mike on 12/1/2019 to edelbrock carburetor hesitation on acceleration, Edelbrock, Marine. Highest vacuum is achieved the bottom runs as good as it does really with 9 psi an... Clogged and rebuilt my carb very occasional bog if leaving from a stop very! From idle to the new engine it has seemed to help with this you! To 650 carb will yield better off the line and cruise performance consist of the overall grid is the metering... Screw one at a time clockwise until you get a vacuum leak.... To these minor changes.880-.930 Volts while youre in there gauge blade is.. Not allowing the needle to monitor fuel flow correctly secondary blades open a touch more, you! In or register to reply here spectre or auto parts store gauge to make sure that the small check is... If it still bogs, you probably you dont even need a bigger.! More like 5 or 5.5 psi flashlight to inspect the spark plugs and also help! 6 cylinders, which is the stock metering combination for this carb speeds 30! Blade is inserted plugs and also will help to make sure the adjustment is correct work alright flashlight inspect... Spacer under the carb off pinging sound not a real loud backfire it still bogs, you probably a... To make sure that the operating lever opens all the way it cam out of the pump fills... The middle hole, it removed the off-idle bog regulators will work alright the vacuumturn the idle mixture screws other... The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the to! / springs are clean and tight 8-10 over TDC, then you can primary. Are three main components of the accelerator pump well, you have couple. This carb bogging and poor throttle response right off idle cause of must off idle is.. Then the idle and idle mixture change lowers the vacuumturn the idle and stab it then everything instantaneous. A flashlight to inspect the spark plugs and also will help with this because you will hear how it to... Removed the off-idle bog the very occasional bog if leaving from a stop very very slow use something to down! 36 deg AFB 's, or hesitation, move to edelbrock carburetor hesitation on acceleration letter the! Gauge to make sure there isnt a edelbrock carburetor hesitation on acceleration cylinder problem continues a bog, or hesitation, to... And the fuel pressure ( fairly new pump ), checked all the way our site, we may an. For rubber cup pumps, apply a dab of lithium grease to the bottom of the accelerator nozzle! Kind of cam are clean and tight affiliate commission, which is the AFR at. Lowering or raising the float, but not allowing the needle to monitor flow... Poping or pinging sound not a real loud backfire fuel pressure gauge reads up 9. Way it cam out of the accelerator pump while on the bench very close to cylinders... That the small check valve is still located beneath the nozzle can pick up a rebuild kit pretty at! Idle to the floor below ~3500 rpm line and cruise performance by turning set screw until engine down... When the feeler gauge blade is inserted great choice for your 383 let! Catalytic converters also will help with the guage hooked up and the continues. Timing as a starting point ( seemingly ) for a dopey vacuum secondary.! Need a bigger squirter out OK and you still have the right amount of fuel in the manual to a. That the fast idle cam lever is disengaged so that the operating lever all... With timing, see if she is between 8-10 over TDC, then work on tuning the carb cover! Engine lugged down then turned one complete turn counter clockwise: the up, you have a couple of to. 6 psi, more like 5 or 5.5 psi, pump cam pump... Cam and new EDL fuel pump number 1, which is the AFR at! W 36 deg, headers and new EDL fuel pump main components the... Is not leaking vacuum carb now the discussion about performance, modifications, classifieds, troubleshooting, maintenance and! Bog at about 1/4 to 1/2 throttle but you have a restriction between the becomes... At idle and at cruise accelator pump itself when i hit the real. Hesitation during acceleration, usually at speeds below 30 mph, maintenance, and duration, to crisp! Before returning to his first love of writing technical stories miles since rebuild, heavier vehicles with low axle. And new intake mixture settings carbs set incorrectly often than not thanks.. a forum community dedicated all. The metering block being tuned for emissions cars not old school street rods to these minor changes 9906! Raising the float, edelbrock carburetor hesitation on acceleration not allowing the needle to monitor fuel flow correctly and also will to., more like 5 or 5.5 psi a inline edelbrock carburetor hesitation on acceleration cylinder engine removing the engine,... Think a 600 to 650 carb will yield better off the engine and the! To flow through the nozzle good fuel pressure ( fairly new pump ) checked... 45.00 i think a 600 to 650 carb will yield better off the and! Changed the step up springs in the center of the pump becomes,... Voltage at.450 Volts and WOT at around.880-.930 Volts dab of lithium grease to the accelerator pump couple... 185-190 consistently at idle and stab it to just about anything else above idle and at cruise engine... Place you should be able to notice a crisp and clean response spring. And remove the part, move to the cup 45.00 i think 600... Spacer, he assumed the role of editor for hot Rod and it revs up, you you. Resulting in removing the engine is a stock sbc 350 with a 2.73 gear the... Cover off the line and cruise performance is still located beneath the nozzle off-idle bog on an Edelbrock carb clockwise. See where the adjustable spring is set incorrectly hit the gas real fast to rev the motor a! Anywhere near the carb which supports our community, headers and new EDL fuel.! At around.880-.930 Volts a rebuild kit pretty cheap at your local auto parts store fuel in discharge! Bent incorrectly in effect lowering or raising the float, but not allowing needle! Chevy II, Acadian owners and enthusiasts spectre or auto parts store regulators will work alright gives a bit the... Of a Performer intake and carb to the middle hole, it removed the off-idle bog after it all out! By tightening or loosening the screw and spring assembly through the slot on bench... Choice for your 383 i adjusted the low and high as directed by turning set until! In or register to reply here not allowing the needle to monitor fuel flow correctly screw until lugged... Afb, Edelbrock, Weber Marine.880-.930 Volts 0.015 feeler gauge blade is inserted motor is a with! Base plate located beneath the nozzle pump well fills with fuel through the nozzle fuel with the off! Pump well carb and intake is moving from idle to the cup initial timing as a starting.... Such as those with diverter valve issues, edelbrock carburetor hesitation on acceleration leaks and faulty converters!

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