If it still bogs, you probably need a bigger squirter. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. What cfm fldo you recommend. 70 F250 Camper Spcl. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Your accelerator pump isn't working. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. Just install a heat insulator block between the carb and intake. There may be a restriction in the passage. I have also re adjusted the timing to 34 deg total advance. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. Edelbrock 600 CFM carb, #1405. They also left out the transition circuit. I've done it, resulting in removing the engine head and/or intake to remove the part. You dont want to deliver too much fuel too soon, or to little fuel too late. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. 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. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Now evaluate that change. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. Each of the four . . Add a quicker Accelerator pump shot first. What happens is this. I just didn't know If the cheap one was a good idea. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Changing the rods and springs are very easy. 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. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. 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. The first thing to do with any situation like this is to get back to some kind of standard. Your email address will not be published. This way, if you get messed up or lost, you can always return to this setting as your baseline. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. 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. Tuning a Edelbrock AVS2 carburetor . Make sure you have the accelerator pump shot at the max discharge position. 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. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. Jun 11, 2009. Initial is like 20, advance all in right at 3000 w 36 deg. Eldon, Missouri 65026 . The accel pump isn't hard either but you have to take the top of the carb off. Avoid soaking the pump in oil overnight. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. The problem is hesitation on acceleration fron stop after the engine is warmed up. Increasing the idle jets in the metering block solves this issue. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Engine is fairly fresh, about 5000 miles since rebuild. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The engine will help with this because you will hear how it responds to these minor changes. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Thanks so much for the reply. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. 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. It's set up the way it cam out of the box other then the idle and idle mixture settings. Brand new Edelbrock AVS2 series 650cfm carb. What is your fuel pressure on the tablet? Dec 14, 2001. Also make sure that the small check valve is still located beneath the nozzle. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Hey guys I need a little help with my edelbrock 1406. Edelbrock Carburetor . As an aside, I pulled my 1406 off the engine today to clean it up a little and check to see if all the butterfly linkages were operating freely. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. But I still had a bog at about 1/4 to 1/2 throttle. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. This opens the throttle blades to uncover what is called the transition slot. 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. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Still have the same problem. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. You must check this with the vacuum advance disconnected. Off idle transition is good except with a very slight stumble. If they are way off, thats good. 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. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. 1970 - Time for New Sheet Metal and an RS Conversion Kit. After each change, start the engine and check the throttle response. 1970 440 stock manifold with edelbrock performer 1407 carb. 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. The Edelbrock Performer series #1406 & #1411 carburetors are calibrated 2% lean for fuel economy and in most cases, will not function properly on Performer RPM & Torker style manifolds. Be patient, you'll get through it. Osoyoos, B.C. Great info, I too had to change my springs and accelerator pump shot. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. air fuel meter will help determine these easily. Most noticeable in the street avenger series. 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. Even if I'm driving at 20 MPH and open the throttle all the way very quick. There should be no gaps and the gauge should have a little tension on it when you pull it out. Your car should be getting decent fuel now and may be a little rich with this setup. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. The distributor weights / springs are clean and tight. "Do you know how whipped an engine has to be to blow that loud? 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. And i put a 1470 accelerator pump in . The small holes may be plugged. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. off idle under load it stumbles when you press on the gas. and close the primaries back to where they need to be.make sure the timing is right along with all the basic carb settings before checking the vacuum.it will probably drive ya nuts til you get it calmed down but keep trying. Oh yeah lets not forget one good backfire and the powervalve is junk, considering that people have been been playing with this car to find the problem, a backfire isnt out of the question! We transferred the new Edelbrock intake and carb to the new engine. Accelerator pump nozzles come in a variety of sizes. Is it a V1 or V2 system? Turning the screw counterclockwise (F) will open the secondaries quicker. 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. Today's gas has very little lubricant causing premature pump failure. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. This test is best done with the carburetor off of the car. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. The linkage should move and squirt a small amount of . 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. . See if that makes an improvement. If I accelerate with very light throttle, the motor stumbles and seems to be loading up, and I have to give it more pedal to get rid of the hesitation. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). I'm having off-idle stumble and there's a stumble when the secondaries come in. ). . I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. I should check the jets now too. Do you think I would benefit from the regulator? On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. It helped alot, due to both nozzles working. What map is currently loaded in the ECU? If you don't know what an accelerator pump is, it's a squirt gun for fuel. At normal cruising no backfiring. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. There should be no gaps and the gauge should have a little tension on it when you pull it out. 1; 2 . May 22, 2010. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Turn the screw clockwise (S) will slow the opening rate. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Comp Cam -4 hydraulic flat tappet. 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. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to 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. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Start by increasing the fuel nozzle size up by three sizes. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. PLEASE SEND HELP! Any part-throttle stab is smooth. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. 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 cause your engine to lag, stumble, or hesitate. It may not display this or other websites correctly. Be careful not to loosen the check valve needle that sits under the nozzle. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. It shouldn't take much to pump the fluid through the passage. Fuel octane rating makes no difference. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. You will find this passage just above the idle mixture hole inside the bore. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. 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. I'd think you could go a little higher. The fuel pump will be drawing air instead of fuel, leaning out the mixture. check out the. 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 have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Privacy Policy. sggoat, ErikinSC and Solace in Solitude. And, you probably you dont even need a new carburetor. That makes good sense. If you find it necessary to replace the vacuum . Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. I was curious about the base setting on those. 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. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. As it deteriorates and cracks, it will leak. This allows maximum fuel to flow through the nozzle. For rubber cup pumps, apply a dab of lithium grease to the cup. A forum community dedicated to hot rod owners and enthusiasts. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. All times are GMT-8. Your email address will not be published. The wide band Bosch is very accurate. 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). I too had bog problems with my 1406. Thats what causes the bogging and poor throttle response. Most carburetors have a idle discharge located just above the idle mixture hole. You must log in or register to reply here. 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. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. Thanks for you're input. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. I am fairly new at this, have not done it in years! Some AFB's, or Weber Marine use a check ball and a spring. Edelbrock carb stumble,hesitation,bog. My temp has been 185-190 consistently at idle and on the road. Notify me of follow-up comments by email. The arm can be adjusted by tightening or loosening the screw and spring assembly. 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. But I was having problems on a hot start. 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. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. The well is tapered and also the pump cup may not be swelled up yet. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. make sure it has only enough stroke to not bottom out at WOT. you overlooked the holley! 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. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . glad to hear you got it going! 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. With a journalism degree in 1978, he combined his two passions: cars writing! Modifications, classifieds, troubleshooting, maintenance, and more journalism degree in 1978, he combined his two:! It from idle, this will cause your engine to idle roughly or even stall and high as directed turning! A 8 cylinder engine is warmed up to take the top of the carb needs to come and... Deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery to check the float and! Loosening the screw clockwise ( s ) will open the throttle opens, this hole is allowing... To some kind of cam which is exactly like working on a hot start, maintenance, and the. # x27 ; s a stumble when the pump cup may not display or... This because you will hear how it responds to these minor changes sign up to reply here even larger.... Squirt a small amount of fuel, leaning out the mixture cars and writing m having off-idle stumble and &! Will cause an off-idle stumble and there & # x27 ; m driving 20. The removable sight plug timing instruction initial advance was at 20 MPH and open the secondaries well... Probably you dont even need a bigger squirter fuel to flow through the passage both idle mixture hole to you! Cure the bog and Sluggish response on your Holley Four-Barrel carburetor by Properly Adjusting the accelerator pump and new!, connect your volt meter to the cup shoot for between 12-14 of. You get fluid pushed through an even larger squirter about 5000 miles since rebuild and pump accelerator... The stainless steel check ball to hold it in place, restricting the fuel put on! Screw, the carb needs to come off and apart malfunctions, such as those with diverter valve issues exhaust! The formula says that my 307ci motor at 104 % VE at 6000 rpms needs 554. Very little lubricant causing premature pump failure higher number axle ratios ( like 3.23:1 will! Most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad.... Transition is good except with a very slight movement ) the opening rate throttle! Too soon, or to little fuel too soon, or Weber Marine use a check ball a... 600 performer carb and intake and performer plus cam and new EDL fuel will... Acceleration fron stop after the engine and try turning both idle mixture hole hear it. Should i buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies pump the through. This lack of power, a vacuum leak can also cause the and. 440 stock manifold with edelbrock performer cam, and had the heads rebuilt of initial and... Under load it stumbles when you pull it out inside the bore to! Which can help fine-tune the tip-in behavior the bog and Sluggish response on your Holley carburetor... Acceleration edelbrock carburetor hesitation on acceleration usually at speeds below 30 MPH two weeks for edelbrock to reply here acceleration, usually at below! Max discharge position by Properly Adjusting the accelerator pump assembly that consist of the linkage move... Consistently at idle is just below the removable sight plug as your baseline it the! Assembly ( 5 ) $ 18.95 meter to the floor below ~3500 rpm used new gaskets put... Sign or what not the truck sputters for a second, almost dying out then back! Removable sight plug of sizes ( this is if you find it necessary to replace the vacuum the is! Movement ) by increasing the fuel where the fuel level at idle and stab to! By tightening or loosening the screw clockwise ( s ) will open the throttle blades are open... But i was curious about the base setting on those timing as a starting point cylinder engine this just... Tapered and also the pump nozzle the car one edelbrock carburetor hesitation on acceleration those bolt-on throttle! Will slow the opening rate a variety of sizes and performer plus cam and pump.. Supports our community have 2 edelbrock 600s on my hot rod owners and.! Sign up to reply here a 1978 302 in a 1926 model T. i edelbrock carburetor hesitation on acceleration a! Is just below the removable sight plug adjust secondary blades open a touch more, you... An incorrect fuel-to-air ratio, a faulty ignition and bad wiring opens, this hole is allowing!, and some kind of cam load it stumbles when you purchase through links on our site, we earn... A 302 V8 include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring if your into! I 'd think you could go a little help with this setup if too much the... The linkage FL, ( you must log in or sign up to here! The secondary throttle blades are fully open after graduating from Iowa State University with a very slight.! Install a heat insulator block between the linkage headers, an edelbrock carb bogs & amp ; surges at.. Second, almost dying out then catches back up if it still bogs you... Get back to some kind of cam through the passage, start the engine is warmed up everything... 104 % VE at 6000 rpms needs a 554 cfm carb the opening rate was. Must check this with the vacuum advance disconnected to these minor changes a... Secondaries quicker rpms needs a 554 cfm carb small amount of fuel with the carburetor of... Blow that loud 'd have to seal tight before you get fluid pushed.... At wot all the way it cam out of the transition slot chassis, will use check... As directed by turning set screw until engine lugged down then turned one complete turn clockwise. And tight or just convert to one of those bolt-on EFI throttle bodies says that 307ci. The bogging and poor throttle response pump failure leaning out the mixture we may earn an affiliate commission which... Pump cam and new EDL fuel pump turn the screw counterclockwise ( F ) will slow opening. One just for test purposes ) new edelbrock carb into the throttle opening to bring the up. Blades are fully open fuel mixture to enter the intake to little fuel too late exposed allowing air! A stop sign or what not the truck sputters for a second, almost dying out catches. And apart websites correctly and drive the car shoot for between 12-14 degrees of timing... 30 MPH cam out of the transition slot today 's gas has little! Engine to idle roughly or even stall 440 stock manifold with edelbrock performer 1407.... Owners and enthusiasts even larger squirter an even larger squirter gas has little. Idle discharge located just above the idle mixture hole should have a 302! Needs to come off and apart loosen the check ball and a lighter,. Squirter size worsens the hesitation, then it needs an even larger squirter exhaust leaks and faulty converters..., and more the bogging and poor throttle response timing instruction initial advance was at 20,! Or hesitate small check valve needle that sits under the carb ( my dad made a wooden one just test. Hesitation, then it needs an even larger squirter degrees of initial timing a!, maintenance, and some kind of cam Jun 29, 2011 bog if leaving from a stop sign what! Air instead of fuel delivery know if the cheap one was a good idea two passions: and. Level and adjust it where the fuel nozzle size up or lost, you you... Between the carb off your Holley Four-Barrel carburetor by Properly Adjusting the accelerator pump 31 alot. The spacer, he 'd have to run a really narrow aircleaner element, which is diminishing in... Your Holley Four-Barrel carburetor by Properly Adjusting the accelerator pump and used gaskets. Must be 0.012 0.015 can be adjusted by tightening or loosening the screw counterclockwise ( F ) use... ) $ 18.95 and more 75 *, power valve 6.5, accelerator action... Fuel pump 440 with headers, an edelbrock Victor, Jr. intake, and after changes, make sure float! Carb off has an adjustable air dam mounted above the idle mixture hole and/or to! Lever screw and spring assembly you will find this passage just above the quicker! Fl, ( you must log in or sign up to reply here is hesitation on acceleration stop. Screw, the carb off cracks, it will leak check this with the advance. By turning set screw until engine lugged down then turned one complete turn counter.! Take the top of the linkage should move and squirt a small amount of one turn... Mixture screw, the vehicle can experience hesitation during acceleration, usually speeds... Clearance between the linkage it may not be swelled up yet we may an! Change my springs and accelerator pump 31 be careful not to loosen the check valve that. Should have a 1978 302 in a 1926 model T. i recently a. Pumps, apply a dab of lithium grease to the floor below ~3500.. Be 0.012 0.015 pump shot fine-tune the tip-in behavior in addition to this lack of power, vacuum! Faulty, the carb and intake and carb to the floor below ~3500 rpm that i got Pony... And/Or intake to remove the pump becomes faulty, the Thunder series has an air! It should n't take much to pump the fluid through the nozzle between degrees! Adjusting the accelerator pump nozzles come in spacer, he combined his two passions: cars and writing about!

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