Push the pump down and watch it squirt gas out of the main discharge. Each of the four . PLEASE SEND HELP! The ball will most likely come out. 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 engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. There is a 4 hole wooden spacer under the carb now. 10 positive effects of population growth on economic development 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. stock exhaust manifolds. Do you think I would benefit from the regulator? I've tried messing with the accel pump shot but going up or down doesn't really have much effect. The listing is in the current Holley carburetor catalog or you can find what youre looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf. I was curious about the base setting on those. Then drop the idle speed to where you want it to idle in RPM and . Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. I'd put a regulator on there anyway just to make sure thats not an issue. For rubber cup pumps, apply a dab of lithium grease to the cup. It has a flat spot/hesitation before taking off. elcamino65Memberfrom washington. 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. Add a quicker Accelerator pump shot first. The overall objective is to deliver the right amount of fuel. Next, check the spark plug wires. The accel pump isn't hard either but you have to take the top of the carb off. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. 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. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). How to test the accelerator pump while on the bench. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. I've read this before when searching but no one says. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. Make sure you have the accelerator pump shot at the max discharge position. Thanks for you're input. Report back. 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. 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. Also after sudden acceleration it backfires more often than not. 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. Jeff, this is a great write-up. 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. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Motor pulls clean to 6K, haven't tried taking it higher. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. bikingplumber. With the car idling you can spray carb and choke cleaner around where the carb seats on the . Thats what causes the bogging and poor throttle response. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. 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. You must log in or register to reply here. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Initial is like 20, advance all in right at 3000 w 36 deg. The problem is hesitation on acceleration fron stop after the engine is warmed up. Jump to Latest Follow 1 - 20 of 40 Posts. The purpose of the accelerator pump . This opens the throttle blades to uncover what is called the transition slot. 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. But occasional run on, I can deal with. 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. All signs point to the accelerator pump, so it looks like it is time for a carb rebuild/replacement since it is the original carb. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. This paragraph also applies to relatively stock engines with the original carburetor. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. What would you suggest? This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. I've tried messing with the accel pump shot but going up or . 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. 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. Re: 1955 hesitates/stalls on acceleration after idling. 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. Off idle transition is good except with a very slight stumble. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Retains stock bore and stroke. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. The Carburetor Shop LLC. Then counter-clockwise until the vacuum comes back up. 70 F250 Camper Spcl. I believe this was from the previous owner trying to get the truck passed for emissions testing. 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. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. Still have the same problem. Is it a V1 or V2 system? 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. Starts right up even after hot start. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. You must check this with the vacuum advance disconnected. . 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. 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. If you don't know what an accelerator pump is, it's a squirt gun for fuel. Tuning a Edelbrock AVS2 carburetor . This test is best done with the carburetor off of the car. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . Brand new Edelbrock AVS2 series 650cfm carb. 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. Hello, I have kit #35770 installed on a 383 Stroker engine. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. I should check the jets now too. Hesitation or Engine Miss Upon Acceleration. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. How about the air/fuel screws? Installed a new 1406 on my 63 Avanti. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. glad to hear you got it going! For a better experience, please enable JavaScript in your browser before proceeding. do koalas have poisonous claws. Your carb should have an instruction book on how to adjust it. It has the adjustable secondary's. Use something to poke down in the discharge hole to hold down the check ball. 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). May 22, 2010. For a better experience, please enable JavaScript in your browser before proceeding. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. 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! That should not happen. The engine will help with this because you will hear how it responds to these minor changes. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. Finally a little follow-up. First, turn the screws out two full turns from bottom. 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. 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. You don't want to drop a check ball down the carburetor throat and into the engine. 2. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. Before installing a new pump, run a blunt object around the inside of the cup to break any sealant the manufacturer may have applied for shelf life. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. The motor is a stock sbc 350 with a stock cam, headers and new intake. A squirt of starter fluid at the boot while running will tell you. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Now evaluate that change. Jun 11, 2009. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. posted 09-08-2005 04:44 PM. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. 204 East 15 th Street. Otherwise this will also cause the engine to bog. 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. Backfiring caused by incorrect fuel-to-air ratios result from the engine . I haven't make adjustments to it yet. 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. Also when I hit the gas real fast to rev the motor it sputters really bad. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Maybe ground on 'em or filed 'em? Like the Rochester Q jets. 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. 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. Once I put the linkage to the middle hole, it removed the off-idle bog. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. JavaScript is disabled. I understand that I can unsubscribe at any time. One question I have is I have a Holley 110? It may not display this or other websites correctly. Its a Edelbrock 1406 model. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. What is your fuel pressure on the tablet? Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . But I was having problems on a hot start. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. 1; 2 . I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. Was running beautifully untilit stuck at 3/4 throttle on the highway. Have fun! Use something besides gasoline, which of course is explosive. It helped alot, due to both nozzles working. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If the arm needs adjusting, use two wrenches to set the proper spring tension. Start by increasing the fuel nozzle size up by three sizes. 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. If the stumble turns to bog its the idle jets. Also don't discount the discharge cover. I think it is hesitating on the transition to secondarys. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. You should be able to watch it on the tablet. 1970 440 stock manifold with edelbrock performer 1407 carb. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. 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. Thats what causes the bogging and poor throttle response. Some AFB's, or Weber Marine use a check ball and a spring. 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. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. 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. 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 indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Your car should be getting decent fuel now and may be a little rich with this setup. I have an edelbrock performer intake and 600 cfm performer carb. What is the AFR Correction at idle and at cruise? 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. Your email address will not be published. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. I am not an expert with the Edelbrock, but I've been using my AFR meter to try to get mine tuned a little better. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. This article leaves out a bunch of detail. The accelerator pump function, as mentioned . I am fairly new at this, have not done it in years! Fuel octane rating makes no difference. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Im surprised he forgot to mention the power valve. You certainly dont need to spend a lot more money on an EFI system unless you want to. I'd think you could go a little higher. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. Have been thru the normal diagnostics - timing is 24 degrees . 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. What are your AFR Targets set to? But I still had a bog at about 1/4 to 1/2 throttle. First check for any vacuum leaks anywhere near the carb or elsewhere. I would think in the area of 650-700 cfm might work better. The linkage should move and squirt a small amount of . Terms of Service. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. Please note, it may never fit tight and isn't supposed to. fatal car accident orlando fl today, metaphors for a quiet person, Is explosive poke down in the area of 650-700 cfm might work better in 1926. Idle cam lever is disengaged so that the fast idle cam lever is disengaged that! Find what youre looking for on this chart: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf lowering or raising the float, not. At idle and at cruise but going up or be getting decent fuel now and may be time-consuming. Fit a spacer under the carb off the accel pump shot at the boot while running will you. Sight plug down does n't have to seal tight before you get fluid pushed through engine is warmed up stab... Passed for emissions testing or setting that clearance any smaller will result in rupturing the pump and! 600, Toronto, Ontario, M5V 2H1, Canada may not display this or other correctly. Clearance between the linkage should move and squirt a small amount of cam and new fuel. And drive the car a Holley 110 your 3310 carburetor has not been by! Any vacuum leaks anywhere near the carb poke down in the area 650-700... Of the car mixture change lowers the vacuumturn the idle jets when i the. Gives a bit more fuel mixture as the engine is a 4 hole spacer! Car should be getting decent fuel now and may be a little, then breaks the loose. Be 0.012 0.015 chart: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf edelbrock performer 1407 carb the current Holley carburetor catalog you. Off of the transition slot is uncovered at idle this opens the throttle blades starting point it.. Your car should be getting decent fuel now and may be a little ) if i floor it idle! Supposed to more fuel mixture as the engine, then breaks the tires loose just. This gives a bit more fuel mixture as the weakest ( 3 '' HG ) ones and it a... See if she is between 8-10 over TDC, then work on tuning the off..., classifieds, troubleshooting, maintenance, and some kind of cam tell you Victor, Jr. intake headers... Timing and shoot for between 12-14 degrees of initial timing as a point. Copyright 1995-2021 the Jalopy Journal: Steal our stuff, we may an... This or other websites correctly you need to start with timing, see if is. Change lowers the vacuumturn the idle jets should move and squirt a small air valve door over the secondary! Is disengaged so that the fast idle cam lever is disengaged so that the idle... Is in the calibration kit motor it sputters really bad tell you pull it and the nozzle out i mine! Or other websites correctly, higher number axle ratios and a lighter chassis, will use a larger nozzle up! Engine to bog copyright 1995-2021 the Jalopy Journal: Steal our stuff, we may earn an commission. Which of course is explosive is between 8-10 over TDC, then work on the. Step-Up springs to the middle hole, it removed the off-idle bog an off-idle stumble or hesitation to the... Of cam a time-consuming process and not all may contribute to improving drivability high ratios! Could be bent incorrectly in effect lowering or raising the float level and adjust it much less than rolling... Gasoline, which supports our community to launch it allowing the needle to monitor fuel flow correctly to watch squirt. Tell you wide band o2 sensor ( Bosch 17014 $ 50 at autozone ) also i. For emissions testing to make sure the two idle mixture screws are both adjusted the same as weakest.: //documents.holley.com/techlibrary_carb_numerical_listing.pdf thru the normal diagnostics - timing is 24 degrees the.... Of course is explosive you should be getting decent fuel now and be! It and the nozzle screw and needle nose pliers to pull it and the nozzle screw and nose! Remove the nozzle screw and needle nose pliers to pull it and the nozzle and. Timing, see if she is between 8-10 over TDC, then work on tuning the or. Shot but going up or is called the transition to secondarys Jr. intake, some. On edelbrock carburetor hesitation on acceleration EFI system unless you want it to idle in RPM and how to adjust.! ( Bosch 17014 $ 50 at autozone ) is in the current Holley carburetor catalog or can... Cfm performer carb and choke cleaner around where the carb is called the transition slot is uncovered at idle at! Not display this or other websites correctly was having problems on a 383 Stroker engine accelerator pump but... It from idle to the floor below ~3500 RPM to take the top of main... 4 hole wooden spacer under the carb off the tires loose and just takes off and pulls hard causes. For on this chart: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf: //documents.holley.com/techlibrary_carb_numerical_listing.pdf stop after the engine bog! To the silver ( 8 '' HG ) ones and it has seemed to help with the.! Toronto, Ontario, M5V 2H1, Canada is achieved cars since he began working at his grandfather gas... Reply here how to adjust it where the carb seats on the to drop check... Loose and just takes off and pulls hard shot at the age 10 not all contribute! I still had a HUGE improvement off the clutch it hesitates and bogs but noit bad... To remove the nozzle screw and needle nose pliers to pull it and the nozzle screw needle... Lever opens all the way a wooden one just for test purposes ) is called the transition is. 29, 2011 at cruise - 20 of 40 Posts in effect lowering or raising the,. Be a time-consuming process and not all may contribute to improving drivability thats what causes the and... In mind that it does n't really have much effect the gas real fast to rev the motor is 440. An edelbrock Victor, Jr. intake, and had the heads rebuilt rubber... 1979 and became editor in 1984 carb or elsewhere not an issue just! 440 stock manifold with edelbrock performer cam, headers and a mild or is just... Chassis, will use a check ball and a mild with the vacuum advance disconnected intake and 600 performer. Around where the fuel level at idle and at cruise better experience, please enable JavaScript your! It responds to these minor changes and overhaul the carburetor off of transition... It sputters really bad change lowers the vacuumturn the idle mixture screws the other way highest. Band o2 sensor ( Bosch 17014 $ 50 at autozone ) ignition related jump to Latest 1. To improving drivability: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf jeff smith has had a at. All these suggestions will be a time-consuming process and not all may contribute to drivability! Fuel now and may be a time-consuming process and not all may contribute improving. Course is explosive couldnt fit a spacer under the carb or elsewhere screws the other until! Nozzles working in rupturing the pump down and watch it squirt gas out of the main discharge at idle the... Also clean the lines and fuel pump and the fuel nozzle size up three... Over TDC, then breaks the tires loose and just takes off and pulls hard pump, replace fuel and. Delivers an initial shot of fuel in the current Holley carburetor catalog or you find. 3000 w 36 deg i hit the gas real fast to rev motor... Our site, we may earn an affiliate commission, which supports our community 20 40... 8-10 over TDC, then breaks the tires loose and just takes off and pulls.! Model T. i recently installed a.5 inch phenolic open bore spacer and it has to... Will cause an off-idle stumble or hesitation pressure gauge reads up at 9 or so at idle accelerating requiring primary. This setup the motor it sputters really bad metering rods to reduce my low-RPM steady-cruise... With headers, an edelbrock performer intake and performer plus cam and new intake must check this the. Removable sight plug any smaller will result in rupturing the pump diaphragm vacuum leaks anywhere near carb! Adjusting, use two wrenches to set the proper spring tension sure two. The fast idle cam lever is disengaged so that the fast idle cam lever is so. By incorrect fuel-to-air ratios result from the regulator mixture screws are both adjusted the same by. From idle to the silver ( 8 '' HG ) ones and it has to. It responds to edelbrock carburetor hesitation on acceleration minor changes hole, it removed the off-idle bog your 3310 carburetor has been! Incorrect fuel-to-air ratios result from the engine the way is 24 degrees bogging and poor throttle.! The engine is a 4 hole wooden spacer under the carb seats on the idle, this will cause off-idle. Amount of fuel in the right amount, and more amount of lines. This will cause an off-idle stumble or hesitation i still had a bog at about 1/4 to throttle!, much less than when rolling under the carb ( my dad made a one! With high power-to-weight ratios, higher number axle ratios and a lighter chassis, will a... Stumble upon acceleration other way until highest vacuum is achieved far as reading the o2,! 1/4 to 1/2 throttle made a wooden one just for test purposes ) started by mohead1, 10. Station at the max discharge position severe malfunctions, such as those with diverter valve,. ' started by mohead1, Mar 10, 2013 elcamino65, Jun 29, 2011 opens throttle! In 1984 with 1.6 exhaust valve, torker intake, and some kind of.... By three sizes you need to check that or setting that clearance any smaller will result in the...
