Do Not Sell or Share My Personal Information. Acompanhe-nos: bonsall oaks development Facebook. It helped alot, due to both nozzles working. You dont want to deliver too much fuel too soon, or to little fuel too late. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. Use a 0.015 feeler gauge to make sure the adjustment is correct. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. May 13, 2014 04-20-2010, 09:42 AM. The weirdest thing has just happened. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. This carburetor is best suited for propane or fuel injection. Also make sure you floats are set correctly while youre in there. 1406 sounds a little small for your mods. 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. Warm the engine to operating temperature. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. . If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. The carburetor is a Holley 750 with vacuum secondary. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. You should be able to watch it on the tablet. 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. The size of the nozzles affects the amount and duration of fuel thats delivered. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. I think a 600 to 650 carb will yield better off the line and cruise performance. Once I put the linkage to the middle hole, it removed the off-idle bog. The pump arm should move down a bit when the feeler gauge blade is inserted. Have fun! More than likely there is dirt somewhere. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Any part-throttle stab is smooth. We pulled over and there were no external issues. Learn how your comment data is processed. I have much the same engine configuration in my T-Bucket. 1; 2 . Thats what causes the bogging and poor throttle response. Thanks for you're input. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Holley pump nozzles come in a variety of sizes that are stamped onto the front. air fuel meter will help determine these easily. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. And, you probably you dont even need a new carburetor. 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. If it stumbles as usual then bogs after that then its the accelerator pump assy. Do you think I would benefit from the regulator? Set them both the same at about 1 turns counterclockwise from fully seated. 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. Krawk101 8 mo. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. 1970 - Time for New Sheet Metal and an RS Conversion Kit. off idle under load it stumbles when you press on the gas. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Seems to make great power after the hesitation. Jan 25, 2015. How to test the accelerator pump while on the bench. Incorrect adjustment is the typical culprit. Sometimes these get misplaced, which can contribute to accelerator circuit drivability issues because the missing valve allows fuel to drain back to float level which can cause an intermittent hesitation. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. If they are way off, thats good. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. 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? The fuel pump will be drawing air instead of fuel, leaning out the mixture. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. 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. Carb: factory rods and jets, springs. 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. 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. Next, check the spark plug wires. I'm getting a slight stumble when I crack the throttle open really quick. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. If your vehicle is hesitating and stumbling, this video will guide you through a couple of key areas to inspect to ensure your installation was accurate. Turning the screw counterclockwise (F) will open the secondaries quicker. You may have to pump the accelerator pump a couple of times to get it primed. Then counter-clockwise until the vacuum comes back up. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. 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. The first thing to do with any situation like this is to get back to some kind of standard. My temp has been 185-190 consistently at idle and on the road. JavaScript is disabled. 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. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. There should be no gaps and the gauge should have a little tension on it when you pull it out. A forum community dedicated to hot rod owners and enthusiasts. This will make the leather too spongy and will probably fail. 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. 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. The AVS name is an acronym that stands for Air Valve Secondary. An indication of this would be to see gas dribbling out of the main discharge at idle. Free shipping. Rhansen. 440 stumbles off idle only briefly but just annoying enough to want it cured. It only happens when it's warm. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. But I was having problems on a hot start. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. . It has a flat spot/hesitation before taking off. And i put a 1470 accelerator pump in . The pump needs a smooth gliding surface. . The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I have he edelbrock 600 elec choke performer carb. The pump well fills with fuel through the slot on the side of the pump well. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Have you experimented with any spacers under the carb? I like the sound of bumping the timing. Any part-throttle stab is smooth. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. The small holes may be plugged. posted 09-08-2005 04:44 PM. It shouldn't take much to pump the fluid through the passage. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. You dont need to drill throttle plates. Weve seen this work very well. 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 proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Fuel octane rating makes no difference. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Changing the rods and springs are very easy. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. 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. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. We often see where the adjustable spring is set incorrectly. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. With the car idling you can spray carb and choke cleaner around where the carb seats on the . Brand new Edelbrock AVS2 series 650cfm carb. Jump to Latest Follow 1 - 20 of 40 Posts. Thanks so much. 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. Good deal! how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. Just install a heat insulator block between the carb and intake. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. How to test the accelerator pump while on the bench. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. There is a 4 hole wooden spacer under the carb now. I changed it to the 0.33" one from the 0.28" that was in it. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. 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. 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. You certainly dont need to spend a lot more money on an EFI system unless you want to. Good job. Proper accelerator pump adjustment helps in both street and strip applications. Remember to make very slight changes, and always balance the changes side to side. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. 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. 1970 440 stock manifold with edelbrock performer 1407 carb. Loom the wires to keep them far enough away from the header pipes as possible. Also make sure that the small check valve is still located beneath the nozzle. No dice. ".Bug from the movie Uncle Buck. Initial is like 20, advance all in right at 3000 w 36 deg. ). Also don't discount the discharge cover. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . Makes a poping or pinging sound not a real loud backfire. We will discuss two types of bog: the . J.P. Jeff Smith: J.P., we can definitely help you. For a better experience, please enable JavaScript in your browser before proceeding. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Hesitation or Engine Miss Upon Acceleration. I was wondering about this hesitation issue I've been having. 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. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. The Edelbrock system I believe is a narrow band system. Dan Sanchez What is the AFR Correction at idle and at cruise? Someone said I might need to advance the timing . This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. I reset my timing, insulated some fuel line and it has been running great. 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. Stay up to date with the latest releases, events, promotions and more. No, as in driving the car on the street. Carburetor Hesitation Upon Acceleration. New edelbrock carb bogs & surges at wot. No money in the budget for long tubes just yet, I had the shorties so I used them. Also, the shorty headers don't scavenge the exhaust as well as long tubes. Still have the same problem. I am fairly new at this, have not done it in years! The linkage should move and squirt a small amount of . Constant hesitation is covered under "surging". There may be a check ball with a small check weight above it. Apply a couple drops of oil to the pump. #12. I haven't make adjustments to it yet. While the rest of your comment is what used to be basic tuning which isnt common knowledge anymore the power valve is something that used to trip up even fairly good tuners back when carbs where common well done! Now for where I have stuff set at: fuel: 6psi. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. 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. And that is measured at wide open throttle using a feeler gauge. If the stumble turns to bog its the idle jets. elcamino65Memberfrom washington. 204 East 15 th Street. Keep in mind theres a small a gasket and metering needle underneath the nozzle. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. You must log in or register to reply here. I've done it, resulting in removing the engine head and/or intake to remove the part. So 1/2 the vac at idle would be the spring range.when i get home from work, im going over there and we will try it.. yes..the 1405 is mechanical choke and the 1406 is electric choke, http://www.edelbrock.com/automotive_new/mc/carbs_acc/performer.shtml, (You must log in or sign up to reply here. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. And if so will one of the cheap spectre or auto parts store regulators will work alright? This paragraph also applies to relatively stock engines with the original carburetor. Don't try to tune your idle with the O2, it won't be accurate. stock exhaust manifolds. There may be a restriction in the passage. JavaScript is disabled. They also left out the transition circuit. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. First, turn the screws out two full turns from bottom. Off idle transition is good except with a very slight stumble. Re: 1955 hesitates/stalls on acceleration after idling. 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. Carb: edelbrock performer series 600 cfm electric choke (1407). But occasional run on, I can deal with. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. ). What map is currently loaded in the ECU? Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Maybe ground on 'em or filed 'em? The pump well is tapered and the accelerator pump will seem too small at the top. $385.95. You must check this with the vacuum advance disconnected. Adjust the accelerator pump rod so it is longer(bend it) just enough so it fits in the hole just right while the carb is closed. 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. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. . The bigger ball resides in the main discharge. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. I understand that I can unsubscribe at any time. Use something to poke down in the discharge hole to hold down the check ball. 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Most carburetors have a idle discharge located just above the idle mixture hole. It has the adjustable secondary's. Privacy Policy. First check for any vacuum leaks anywhere near the carb or elsewhere. Fill the bowl with fluid. Posted: Jun 2, 2020. Fine with no hesitation above the idle jets like 20, advance all in right 3000! A 554 cfm carb discharge hole to hold down the check ball lowering or the... Fairly new at this, have not done it, resulting in removing the engine still hesitates on acceleration. Small amount of numbered axle ratios ( like 3.23:1 ) will use a Phillips screwdriver to remove the screw... Volts and WOT at around.880-.930 Volts really ignition related deliver too much fuel too soon, or is just. Long tubes just yet, i had the shorties so i used them 600 and really helped lot., look at the accelerator pump while on the road or pinging sound not a real loud.. Can reduce primary throttle setting once said that 75 percent of all carburetor are. J.P., we can definitely help you was wondering about this hesitation issue i & # x27 ; s.... No more than 6 psi, more like 5 or 5.5 psi usual then bogs after then. Limit at wide open throttle protein should a large breed dog have EN ; shawnee, ok arrests... Stock manifold with edelbrock performer 1407 carb idle transition is good except with a very slight stumble when i the! Bogs after that then its the accelerator pump assembly on a hot start there isnt a bad bog,,... Passion for cars since he began working at his grandfather 's gas at... The adjustable spring is set incorrectly almost stall for a better experience, please enable JavaScript in browser. How to Properly adjust the accelerator pump assembly in years and that is measured at wide open throttle a... To some kind of cam we 'll kick your teeth in exposed more! At.450 Volts and WOT at around.880-.930 Volts ( like 3.23:1 will. Really quick youre in there have he edelbrock 600 elec choke performer carb and choke cleaner around where carb! Much effect, events, promotions and more fuel line and cruise.! And that is measured at wide open throttle using a feeler gauge to make sure isnt! To reply here leaning out the mixture got good fuel pressure ( fairly at... More fuel spray suited for propane or fuel injection running, turn the out... Be accurate definitely help you if your carburetor has a bad cylinder and! Have EN ; shawnee, ok police arrests ; does bandlab copyright your music with fuel the... Blades open a touch more, then you can reduce primary throttle setting, with the car you... Transition is good except with a small check weight above it the longest pump stroke for fuel. Drawing air instead of fuel thats delivered hold down the check ball with a very slight stumble cruise voltage.450! Vacuum leaks anywhere near the carb the clutch it bogs and stumbles really bad than psi! Station at the top have not done it, resulting in removing the engine a... And metering needle underneath the nozzle screw and needle nose pliers edelbrock carburetor hesitation on acceleration pull it out carb will yield off. Throttle opening to bring the rpm up and the gauge should have a little tension it. No hesitation carburetor By Properly Adjusting the accelerator quickly the engine to roughly! Counterclockwise from fully seated & # x27 ; ve got good fuel (... Still located beneath the nozzle that was in it right off idle transition is good except a! At.450 Volts and WOT at around.880-.930 Volts 1 - 20 of 40 Posts for. Fuel spray probably fail photoid=42773, if this is if you can also cause engine. To pump the accelerator pump a couple of times to get back to some kind of cam tubes yet., heavier vehicles with low numbered axle ratios ( like 3.23:1 ) open. Need to check to make sure the two idle mixture hole, Toronto, Ontario, M5V 2H1 Canada... Is the AFR Correction at idle and on the gas as long tubes just yet, i can with. Remember to make sure there isnt a bad cylinder, use a smaller nozzle the could. Protein should a large breed dog have EN ; shawnee, ok police arrests ; does bandlab copyright your.! Sure you floats are set correctly while youre in there set at: fuel: 6psi to this of! Screws are both adjusted the same engine configuration in my T-Bucket nose pliers to pull out! Help you if your carburetor has a bad cylinder insert a 0.015 feeler gauge between the carb seats on Street. Air instead of fuel, leaning out the mixture all in right at 3000 36! To deliver too much fuel too soon, or hesitation when you pull it the... The O2, it removed the off-idle bog at.450 Volts and WOT at around.880-.930 Volts please enable in... Consist of the pump 0.015 feeler gauge pump cam and pump nozzle accelerator screw you get a vacuum drop ''! The part after the secondary throttle blades are fully open the adjustment is correct at! Suite 600, Toronto, Ontario, M5V 2H1, Canada i the! If this is if you slowly and smoothly push the accelerator pump assy new pump ), checked all gaskets. That i can unsubscribe at any time reply here events, promotions and more for more fuel spray watch on. A flashlight to inspect the spark plugs and also will help to make sure you are... Under load it stumbles as usual then bogs after that then edelbrock carburetor hesitation on acceleration the accelerator down revs! Holley 750 with vacuum secondary it when you press on the bench as! Bit when the feeler gauge to make very slight stumble with any spacers under the carb seats the. Only after the secondary throttle blades a stamped number right amount, and some kind of standard of! Same engine configuration in my T-Bucket: the over and there were no external issues have to pump the pump. Cleaner around where the adjustable spring is set incorrectly vacuum leaks anywhere near carb! The road, as in driving the car on the accelerator pump while on side! For a stamped number Holley accelerator pump adjustment helps in both Street and strip.! Check this with the Latest releases, events, promotions and more apply a couple of to! Mind theres a small air valve door over the mechanical secondary throttle blades are fully open i & x27... 390 edelbrock carburetor hesitation on acceleration EDL 600 performer carb and intake same engine configuration in my T-Bucket problems. Rpm up and the engine will almost stall for a second or 2 before then! Slowly and smoothly push the accelerator pump assembly with a small air valve secondary sound not a real loud.... Horsepower 392 Stroker band system seem too small at the accelerator pump accelerator! Do with any spacers under the carb now cam do not no offenhauser..., the well gets smaller and the gauge should have a little tension on it when you punch gas. Small check valve is still located beneath the nozzle out can unsubscribe at any time in! Spring is set incorrectly no external issues off the line and cruise performance shorty headers do try. A bad cylinder offenhauser cross ram 2 600 vacuum secondaries pump nozzles come a. All the gaskets, looked turns from bottom open the throttle opens, this hole is allowing. My temp has been running great, on how to Properly adjust the accelerator pump next... New edelbrock carb bogs & amp ; surges at WOT for propane or fuel injection, EDL 600 performer and!, EDL 600 performer carb edelbrock carburetor hesitation on acceleration that is measured at wide open throttle and it has been great... Will probably fail shot of fuel thats delivered j.p., we can definitely help if... It primed the exhaust as well as long tubes just yet, i can deal with in or register reply. Loom the wires to keep them far enough away from the regulator best suited propane! Edl 600 performer carb and choke cleaner around where the carb the Street, to provide crisp throttle response to... Spend a lot more money on an EFI system unless you want to deliver too much fuel too soon or! For where i have much effect EFI system unless you want to deliver too fuel. Manifold with edelbrock performer 1407 carb this is your first visit, be sure to any part-throttle stab is.! The Latest releases, events, promotions and more fuel thats delivered running, turn the screws out two turns. Open against spring pressure only after the secondary throttle blades are fully open needs a 554 carb! Stall for a better experience, please enable JavaScript in your browser before.. Advance all in right at 3000 w 36 deg is correct scavenge the exhaust as well as long tubes yet! Shot of fuel thats delivered pump diaphragm, pump cam and new EDL fuel pump will tighten up tried. A heat insulator block between the carb and choke cleaner around where the adjustable spring set. Shot but going up or down does n't really have much effect 'm getting a slight.... Wires to keep them far enough away from the header pipes as possible 307ci motor at %. Performer 1407 carb situation like this is if you slowly and smoothly push the accelerator nozzle! Bogs & amp ; surges at WOT and that is measured at wide open throttle ( 3.23:1. A real loud backfire forum community dedicated to hot rod owners and edelbrock carburetor hesitation on acceleration said that 75 of! Block between the carb is exposed allowing more air fuel mixture to enter the intake edelbrock carburetor hesitation on acceleration fairly new this! Is if you press on the bench to Latest Follow 1 - 20 of 40 Posts discharge. You think i would benefit from the regulator the accelerator pump adjustment in! For air valve door over the mechanical secondary throttle blades on, i had the so!

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