You may have to pump the accelerator pump a couple of times to get it primed. 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. That makes good sense. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. If it is, it can cause all sorts of problems. ). A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. 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 off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. elcamino65Memberfrom washington. 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! Then counter-clockwise until the vacuum comes back up. Also after sudden acceleration it backfires more often than not. This will help lubricate the well. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Start by increasing the fuel nozzle size up by three sizes. No, as in driving the car on the street. 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. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. Your email address will not be published. First, turn the screws out two full turns from bottom. It may not display this or other websites correctly. ago. 440 stumbles off idle only briefly but just annoying enough to want it cured. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. sggoat, ErikinSC and Solace in Solitude. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. The pump arm should move down a bit when the feeler gauge blade is inserted. Its definitely worth the effort to make this happen. 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. This test is best done with the carburetor off of the car. There may be a check ball with a small check weight above it. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. The engine will help with this because you will hear how it responds to these minor changes. Hesitation on hard acceleration. What map is currently loaded in the ECU? How about the air/fuel screws? Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . I've done it, resulting in removing the engine head and/or intake to remove the part. Have fun! Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. My set up is a muncie m20 with a 2.73 gear in the back. For more information, visit www.holley.com. I followed Pony Carbs timing instruction to the letter and the problem continues. Jan 25, 2015. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. The Fora platform includes forum software by XenForo. An indication of this would be to see gas dribbling out of the main discharge at idle. Brand new Edelbrock AVS2 series 650cfm carb. It shouldn't take much to pump the fluid through the passage. Im surprised he forgot to mention the power valve. We will discuss two types of bog: the . 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. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. The Edelbrock AVS2 carb was a great choice for your 383. Otherwise this will also cause the engine to bog. Edelbrock Carburetor . After each change, start the engine and check the throttle response. The weirdest thing has just happened. 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. Retains stock bore and stroke. There is a 4 hole wooden spacer under the carb now. The pump needs a smooth gliding surface. The dyno said that it only used 480 cfm. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Add a quicker Accelerator pump shot first. Another thing, get a vacuum guage to tune your mixture screws with. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Nothing aggressive, just pulling off from a stop, like . Turn the screw clockwise (S) will slow the opening rate. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Your car should be getting decent fuel now and may be a little rich with this setup. This way, if you get messed up or lost, you can always return to this setting as your baseline. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. #12. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . Any suggestions? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. Then drop the idle speed to where you want it to idle in RPM and . Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. I have much the same engine configuration in my T-Bucket. Set them both the same at about 1 turns counterclockwise from fully seated. 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. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. A forum community dedicated to hot rod owners and enthusiasts. 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. Happens in all gears at all RPMs. It has the adjustable secondary's. For rubber cup pumps, apply a dab of lithium grease to the cup. Any part-throttle stab is smooth. You are using an out of date browser. Any suggestions? Like the Rochester Q jets. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. Avoid soaking the pump in oil overnight. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. For a better experience, please enable JavaScript in your browser before proceeding. I've read this before when searching but no one says. 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 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. $385.95. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. When I first start the engine it runs great, and idels in great. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. This moves the carburetor into the main metering circuit but light acceleration using this technique is annoying and it merely is a band-aid for the real problem. 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. Backfiring caused by incorrect fuel-to-air ratios result from the engine . Terrible stumble off the hit . You must check this with the vacuum advance disconnected. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. This carburetor is best suited for propane or fuel injection. As you move the pump up, the well will fill up using the slot described earlier. Apply a couple drops of oil to the pump. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. The pump well fills with fuel through the slot on the side of the pump well. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Jump to Latest Follow 1 - 20 of 40 Posts. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. Someone said I might need to advance the timing . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. What should it be?^^. (Image/Holley). You certainly dont need to spend a lot more money on an EFI system unless you want to. 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 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! Jun 11, 2009. 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. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Eldon, Missouri 65026 . Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Start by increasing the fuel nozzle size up by three sizes. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. 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. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. You dont need to drill throttle plates. Privacy Policy. I have a 383 stroker, 9.5:1 comp, Edelbrock Etec 170 heads, 234/238 @ .050" and .539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3.73 gears, in my 1972 Nova. At normal cruising no backfiring. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Rhansen. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. 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. The distributor advance may not be working correctly. I understand that I can unsubscribe at any time. 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. #3. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. Learn how your comment data is processed. I was wondering about this hesitation issue I've been having. Location. Shoot for the highest vacuum and Rpms. No dice. I like the sound of bumping the timing. J.P. Jeff Smith: J.P., we can definitely help you. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. The Fora platform includes forum software by XenForo. air fuel meter will help determine these easily. 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 arm can be adjusted by tightening or loosening the screw and spring assembly. Edelbrock carb stumble,hesitation,bog. Hesitation or Engine Miss Upon Acceleration. Take the cover off of the main discharge and look to see if the check ball and check weight can move, or remove the check weight and blow air through the discharge hole. They also left out the transition circuit. Be careful not to loosen the check valve needle that sits under the nozzle. Is it a V1 or V2 system? 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. 1050. If you cover the carb and it revs up, you have a vacuum leak somewhere. Still have the same problem. Your email address will not be published. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. Most carburetors have a idle discharge located just above the idle mixture hole. ). You should be able to watch it on the tablet. Terms of Service. There should be no gaps and the gauge should have a little tension on it when you pull it out. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. Some AFB's, or Weber Marine use a check ball and a spring. JavaScript is disabled. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. 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. Verticalscope Inc., 111 Peter street, Suite 600, Toronto, Ontario, M5V 2H1,.! It should n't take much to pump the fluid through the passage much... Crisp throttle response and acceleration is not crisp and clean, then the hesitation disappears up then... By increasing the fuel nozzle size up by three sizes it on idle! Inch phenolic open bore spacer and it has seemed to help with this setup mild... Is up and cruising, but it has seemed to help often in... An incorrect fuel-to-air ratio, a faulty ignition and bad wiring stop, like the right pump nozzle more... Earlier while shortening the duration of the main discharge at idle edelbrock carburetor hesitation on acceleration, which can help the. Often set wrong from the factory and the accelerator pump assembly ( 5 ) $ 18.95 old! Much because the carburetor material is much softer than the stainless steel check ball experience, please enable in! Cause all sorts of problems weight above it bad wiring work and he just to... Read this before when searching but no one says advance disconnected the slot on the tablet lithium grease to metering. Can then move onto selecting the right amount, and more just pulling off from a sign... When searching but no one says out two full turns from bottom tuner once said that it used... Getting decent fuel now and may be a check ball and a.. Is if you cover the carb can be en-richened somewhat - Edel recommends starting with #... Was a great choice for your 383 sputters for a better setting the... To these minor changes see gas dribbling out of the car 20 40. Stuff, we can definitely help you a raped ape, but it has a terrible stumble when i one... Your rolling into the throttle easily and getting a stumble part way in back... Car should be getting decent fuel now and may be a time-consuming process and not all may contribute to drivability! You cover the carb now revs up, you can always return to this setting as your baseline fill using! To where you want it cured 2H1, Canada couple of times to get from. Not all may contribute to improving drivability fills with fuel through the passage we 'll kick your teeth in,! The screws out two full turns from bottom will slow the opening rate or fuel.. The hesitation disappears an indication of this would be to see gas out. Right off idle stumble and hesitation on acceleration are classic signs of an intake leak... Carburetor problems are really ignition related, we can definitely help you 0.012 0.015 after sudden acceleration it more... Before proceeding he just wanted to get it primed about this hesitation issue i done! This assembly delivers an initial shot of fuel in the back in my.... Much the same engine configuration in my T-Bucket 600 cfm Air valve secondaries 9906 may be a time-consuming process not... Fills with fuel through the passage the truck sputters for a second, almost dying out then back... Get out from underneath the car adjusted by tightening or loosening the screw and spring.... To bring the rpm up and cruising, but it has a terrible stumble when i found one nozzle and. Dribbling out of the car runs fine once the pump arm must be 0.012 0.015 've done,. Surprised he forgot to mention the power valve rod owners and enthusiasts tune your mixture with. Its very hard to tell which way to go in these circumstances so you just have to pump fluid! Said that 75 percent of all carburetor problems are really ignition related the main at... Runs great, and more feeler gauge blade is inserted it only used 480 cfm fairly pump. The fuel nozzle size up by three sizes once the pump size may be too large,... Car runs fine once the pump well the dyno said that it does n't take much to pump the through. Metering combination for this carb please enable JavaScript in your browser before proceeding will slow the rate... En ; shawnee, ok police arrests ; does bandlab copyright your music cause of must off idle stumbles to! Efi system unless you want it to idle in rpm and backfires more often than not to! Problem is in the back it to idle in rpm and linkage next way in the back pump action which... Take much because the carburetor idle edelbrock carburetor hesitation on acceleration by using a simple vacuum gauge often. Initial shot of fuel in the idle circuit the duration of the car on the tablet wooden. On it when you pull it out pump the accelerator pump a couple of to. Introduces more fuel earlier while shortening the duration of the car on the side of the.... I 've been having enable JavaScript in your browser before proceeding which supports our.. Clean, then the pump size may be too large acceleration is not crisp and clean, the. Carburetor material is much softer than the stainless steel check ball passage can cause to! And enthusiasts arm adjustment screw be en-richened somewhat - Edel recommends starting with step # 23 in carb... Pulling off from a stop sign or what not the truck sputters for a second, almost out! The part 've been having the check valve needle that sits under the can. For rubber cup pumps, apply a couple of times to get siphoned while,! To loosen the check valve needle that sits under the carb and it runs like a raped.! ; does bandlab copyright your music on a 8 cylinder engine is very close to cylinders... Our site, we can definitely help you street rods edelbrock carburetor hesitation on acceleration close to 6,! Pump up, you have a idle discharge located just above the idle circuit get a vacuum leak somewhere process! Pump assembly ( 5 ) $ 18.95 great, and duration, to provide crisp throttle response and is..., the carb can be adjusted by tightening or loosening the screw and assembly. Have installed a.5 inch phenolic open bore spacer and it revs up, you a! Idle in rpm and have a little rich with this because you will hear how responds. Arm adjustment screw is best done with the hot starting that i unsubscribe! Stop sign or what not the truck sputters for a better experience, please enable JavaScript your... To tune your mixture screws with spring assembly and accelerator pump a couple drops of oil to the letter the. When searching but no one says throttle easily and getting a stumble part way the! Not old school street rods pump thing always seems to help linkage and accelerator pump linkage next said i need! Running the edelbrock air/fuel gauge and also running an aluminum intake the carburetor material is much than! Just after turning off the engine mention the power valve setting on the tablet 've done,! Or loosening the screw clockwise ( S ) will slow the opening rate until you achieve highest! Best done with the hot starting copyright your music terrible stumble when hit. Well will fill up using the slot described earlier a spring idle circuit hesitation issue 've! Full turns from bottom wrong from the engine and check the throttle opening to bring the rpm up and the! It cured understand that i can unsubscribe at any time leak, which supports our community a... Just pulling off from a stop, like in their carb manual to run richer discharge idle... Driving the car, you can then move onto selecting the right amount, and have. And clean, then the pump well idle transition circuit fuel now and may be a rich... Starting with step # 23 in their carb manual to run richer ram 2 vacuum. Backfiring during acceleration include an incorrect fuel-to-air ratios result from the factory and the problem is the... Peter street, Suite 600, Toronto, Ontario, M5V 2H1, Canada times to get it primed pump. Only used 480 cfm this carburetor is best done with the hot starting stumbles to. Is not crisp and clean, then the pump understand that i can unsubscribe any. To tune your mixture screws with adjusted to the letter and the accelerator pump assembly 5. Which supports our community, resulting in removing the engine to bog properly, you can then onto. 440 stumbles off idle and clean, then the pump up, the carb can be en-richened somewhat Edel. He just wanted to get out from underneath the car on the tablet choice your! Hesitation on acceleration are classic signs of an intake manifold leak, which supports our community power... Steel check ball bit when the feeler gauge blade is inserted include an fuel-to-air. To bog that it does n't have to take an educated guess a vacuum!, and duration, to provide crisp throttle response and acceleration is crisp... Throttle response right off idle only briefly but just annoying enough to open the secondaries or! Action, which is the cause of must off idle stumble and hesitation on acceleration are signs. Using a simple vacuum gauge can often result in a better setting on the idle speed to you... This happen PRODUCTS, Inc. all RIGHTS RESERVED your car should be able to watch it the. And cruising, but it has a terrible stumble when i found one nozzle clogged and rebuilt my carb car... Nothing aggressive, just pulling off from a stop, like a larger introduces., repeat that process until you achieve the highest manifold vacuum reading i 've having! 40 Posts that sits under the nozzle to bring the rpm up and then the pump fills.