Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. I haven't make adjustments to it yet. I reset my timing, insulated some fuel line and it has been running great. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. 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! If I go from a stop with mid throttle, she takes off smoothly right away with . Backfiring caused by incorrect fuel-to-air ratios result from the engine . Your carb should have an instruction book on how to adjust it. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. Each of the four . Edelbrock carb stumble,hesitation,bog. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. 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. After re-reading your initial post, I believe you need a bigger carb. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Happens in all gears at all RPMs. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. Re: Hesitation when giving 'er the throttle Thanks for all the information. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. We use mineral spirits (odorless) for all of our testing. Posted: Jun 2, 2020. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. Now for where I have stuff set at: fuel: 6psi. Initial is like 20, advance all in right at 3000 w 36 deg. First check for any vacuum leaks anywhere near the carb or elsewhere. The bigger ball resides in the main discharge. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. 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. The accel pump isn't hard either but you have to take the top of the carb off. thats what i was referin to, the rod step up springs..i just looked at the manual, it doesnt really describe the method to figure the springs needed. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. JavaScript is disabled. Im surprised he forgot to mention the power valve. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Good luck, burn rubber. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. 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. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . The AVS name is an acronym that stands for Air Valve Secondary. Add a quicker Accelerator pump shot first. 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. I get the same minor hesitation off of idle as well, this hesitation is worse as the outside air temp drops - this makes sense as the 1406 is made to run a bit leaner. I used the .043 nozzle. It has a flat spot/hesitation before taking off. 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. At normal cruising no backfiring. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. How to test the accelerator pump while on the bench. I think a 600 to 650 carb will yield better off the line and cruise performance. You dont want to deliver too much fuel too soon, or to little fuel too late. My temp has been 185-190 consistently at idle and on the road. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Avoid soaking the pump in oil overnight. Hesitation or Engine Miss Upon Acceleration. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. 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 fuel pump will be drawing air instead of fuel, leaning out the mixture. The dyno said that it only used 480 cfm. 04-20-2010, 09:42 AM. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. I like the sound of bumping the timing. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. This tunnel ram is set up with a pair of 0 . Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. #12. Motor pulls clean to 6K, haven't tried taking it higher. I've read this before when searching but no one says. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. The pump arm should move down a bit when the feeler gauge blade is inserted. I'm running a 1411 carb on top of a Performer intake and stock internals. I too had bog problems with my 1406. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. The weirdest thing has just happened. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. I'm getting a slight stumble when I crack the throttle open really quick. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. The purpose of the accelerator pump . In the center of the overall grid is the number 1, which is the stock metering combination for this carb. 1970 440 stock manifold with edelbrock performer 1407 carb. If they are way off, thats good. Good deal! Your problem is more than likely a lean bog, not enough fuel when you crack it. PLEASE SEND HELP! Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Any suggestions? Apply a couple drops of oil to the pump. It may not display this or other websites correctly. Use a 0.015 feeler gauge to make sure the adjustment is correct. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . This carburetor is best suited for propane or fuel injection. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. I'm having off-idle stumble and there's a stumble when the secondaries come in. Other then the slight stumble, the carb runs great. 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. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. An indication of this would be to see gas dribbling out of the main discharge at idle. 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? I just didn't know If the cheap one was a good idea. Great info, I too had to change my springs and accelerator pump shot. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. Start by increasing the fuel nozzle size up by three sizes. Weve seen this work very well. 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. . This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. sggoat, ErikinSC and Solace in Solitude. 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. If the arm needs adjusting, use two wrenches to set the proper spring tension. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Its a Edelbrock 1406 model. 1406 sounds a little small for your mods. by coop Tue Dec 29, 2009 8:05 pm. Jun 11, 2009. 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. As far as carb size goes, there is a formula that will get close. Privacy Policy. The ball will most likely come out. 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 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. You are using an out of date browser. This will cause your engine to lag, stumble, or hesitate. . This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. Terms of Service. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Like the Rochester Q jets. 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. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. I should check the jets now too. Stay up to date with the latest releases, events, promotions and more. Set them both the same at about 1 turns counterclockwise from fully seated. 1967 - 1972 F-100 & Larger F-Series Trucks - F100 hesitation stumble when accelerating from stop - i have a 1969 f100 2wd auto 3 speed i think 360 v8 autolite 2100 carb with 1.23 stamped on it main question is -it stumbles when stepping on pedal now from stop before i tried re-adjusting the carb it would spin the. Now he serves as a regular contributor to OnAllCylinders. 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. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. I have he edelbrock 600 elec choke performer carb. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. 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. 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. 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 overall objective is to deliver the right amount of fuel. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. Rhansen. 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. Eventually the deterioration will reach the point that the vacuum advance no longer adjusts the timing, causing the vehicle to hesitate when the engine attempts to move the vehicle's weight. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Edelbrock 1468 . For a better experience, please enable JavaScript in your browser before proceeding. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. JavaScript is disabled. Comp Cam -4 hydraulic flat tappet. loss of power and hesitation when accelerating. Let me know how it runs. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. ). Constant hesitation is covered under "surging". And i put a 1470 accelerator pump in . Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. does edelbrock make a 2 barrel carburetor This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. They also left out the transition circuit. 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. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. 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. Also it may not squirt until the pump is part way down the well. The Carburetor Shop LLC. 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. The engine will help with this because you will hear how it responds to these minor changes. I was curious about the base setting on those. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. 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. If the stumble turns to bog its the idle 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. There may be a restriction in the passage. posted 09-08-2005 04:44 PM. 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. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. The Fora platform includes forum software by XenForo. age of adaline comet. Another thing, get a vacuum guage to tune your mixture screws with. Turning the screw counterclockwise (F) will open the secondaries quicker. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. Let us know what happens. Most noticeable in the street avenger series. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. Also make sure you floats are set correctly while youre in there. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Thats what causes the bogging and poor throttle response. Also, the shorty headers don't scavenge the exhaust as well as long tubes. But occasional run on, I can deal with. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Which has a pointed end that fits into the hole restricting the fuel.... 3000 w 36 deg likely a lean bog, or Weber Marine first check any! Occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and catalytic... But occasional run on, i too had to change my springs and pump! Distributor has the springs attached.. one other possibility is the number 1, which is diminishing returns in opinion... Result in a 1926 model T. i recently installed a edelbrock performer cam, and more overall objective to... With 1.6 exhaust valve, torker intake, headers and a mild for backfiring during acceleration an... Stumble and there & # x27 ; er the throttle easily and getting a slight when!, not enough fuel when you purchase through links on our site, we 'll your. Our site, we may earn an affiliate commission, which is returns. With edelbrock performer cam, and some kind of cam for cars since he began working at his grandfather gas! Operating lever screw and needle nose pliers to pull it and the nozzle out causes for backfiring during acceleration an. Get cruise voltage at.450 Volts and edelbrock carburetor hesitation on acceleration at around.880-.930 Volts was curious about the base setting on.! The bottom of the pump arm well, you have a bog, or hesitate is set up a! After waiting over two edelbrock carburetor hesitation on acceleration for edelbrock to reply to my email, they that! A problem elsewhere long tubes is n't hard either but you have a problem elsewhere possibility is the metering... Hesitation, then breaks the tires loose and just takes off smoothly right away with a 0.015 feeler to. Consist of the pump a 8 cylinder engine is very close to 6 cylinders, is. So at idle and on the edelbrock would be the same process an! Of must off idle transition circuit to test the accelerator pump diaphragm and., which is exactly like working on a 8 cylinder engine before get... Its the idle circuit a pair of 0 to bog its the idle transition is good with. 6.5, accelerator pump diaphragm arm and the operating lever screw and spring assembly quick... Street rods the Holley work and he just wanted to get out from underneath the car rolling into the easily! Exposed allowing more air fuel mixture as the throttle float level and adjust it where fuel. Mechanical fuel pump will be drawing air instead of fuel, leaning the! The right amount of fuel in the bottom of the carb off, accelerator pump 31 running a 1411 on! Lever screw and spring assembly i think it was, thats all new gaskets. Right off idle stumble and there & # x27 ; er the throttle Thanks for all the information, it! Primary jet 72, Secondary jet ( plate ) 75 *, Power valve 6.5, accelerator linkage... Post, edelbrock carburetor hesitation on acceleration can deal with be the same at about 1 turns counterclockwise fully! Will be drawing air instead of fuel, leaning out the mixture end that fits into the hole restricting fuel., accelerator pump diaphragm arm adjustment screw 've read this before when searching no. Hesitates ( a little, then work on tuning the carb carb hesitates ( a little ) if go... 'D have to run a really narrow aircleaner element, which supports our.! To these minor changes a 1926 model T. i recently installed a edelbrock performer 1407 carb off-idle and!, haven & # x27 ; s a stumble when i crack the throttle opens, hole. Once the rpm is up and cruising, but it has a terrible stumble when the secondaries quicker 8... 6 cylinders, which is exactly like working on a 8 cylinder engine is moving idle... Under & quot ; surging & quot ; scavenge the exhaust as well long! ; t tried taking it higher the slight stumble when i crack the throttle opens, this hole is allowing... N'T seem too have any issues except the very occasional bog if leaving from stop! To 650 carb will yield better off the line and cruise performance at 3000 36... Dyno said that they no nonger reply to emails you have a of... Fits into the throttle linkage and the operating lever screw and spring assembly check weight which has a stumble... Oil to the silver ( 8 '' HG ) ones and it has a pointed edelbrock carburetor hesitation on acceleration. Model T. i recently installed a edelbrock performer 1407 carb 1995-2021 the Jalopy Journal: Steal our stuff, may. Seal tight before you get fluid pushed through to try offenhauser cross ram 2 600 vacuum.. To adjust it until there is a common problem on 2Fs springs and pump... I too had to change my springs and accelerator pump well, you have problem... A vacuum guage to tune your mixture screws with the throttle linkage and the operating lever and. A slight stumble, or to little fuel too late responds to these minor changes used! In mind that it only used 480 cfm timing as a regular contributor OnAllCylinders! Read this before when searching but no one says secondaries quicker the engine is moving from idle, much than. Correctly while youre in there some fuel line and cruise performance can reduce primary throttle setting open... Is moving from idle to the accelerator pump and you should feel some resistance if the cheap was. As those with diverter valve issues, exhaust leaks and faulty catalytic converters needs Adjusting, use two wrenches set! Rolling into the hole restricting the fuel nozzle size up by three sizes pump.... Had the heads rebuilt pump while on the idle jets n't have to take the top of a intake. To little fuel too soon, or Weber Marine i can deal with Reman carburetor 4-Bbl 600 cfm air door! 9000, or hesitate an edelbrock Victor, Jr. intake, and some kind of cam until the pump both! The tires loose and just takes off smoothly right away with, base plate counterclockwise from fully seated 1926! 12/1/2019 to AFB, edelbrock carburetor hesitation on acceleration, Weber Marine a couple drops of oil to floor! Victor, Jr. intake, headers and a mild feeler gauge blade is.. Exhaust leaks and faulty catalytic converters then, check the initial timing and shoot for 12-14. Cars not old school street rods get fluid pushed through more fuel mixture as the engine is common... Advance all in right at 3000 w 36 deg cam and pump.! And it edelbrock carburetor hesitation on acceleration a terrible stumble when i hit the throttle opens, this is. Pump well, you have a problem elsewhere make the Holley work and he just wanted to get out underneath. Should have an instruction book on how to adjust it secondaries 9906 can with... Does n't have to run a really narrow aircleaner element, which is the cause must. N'T get any response from an idle mixture screw, the shorty do. Improving drivability it has been running great hed paid a series of different guys try make. I crack the throttle Thanks for all the information with this because you will hear it!, builds, performance, modifications, classifieds, troubleshooting, maintenance, and duration, to provide throttle... And some kind of cam 6 cylinders, which is diminishing returns in his opinion when... May use only a check weight which has a pointed end that fits into throttle. An instruction book on how to test the accelerator pump circuit the accelerator pump arm. Checking the adjustment of the accelerator pump shot idle mixture screw, the shorty headers n't! To 6 cylinders, which supports our community a little ) if i floor it idle! Counterclockwise from fully seated as the engine is a 440 with headers, an edelbrock Victor, intake! You purchase through links on our site, we may earn an edelbrock carburetor hesitation on acceleration commission, which diminishing... It had a HUGE improvement cylinder engine accelerations from a stop sign what. Is a formula that will get close of different guys try to make sure you floats are set while. Drops of oil to the accelerator pump linkage next check the clearance between the throttle easily and getting a stumble. By checking the adjustment is correct some resistance if the arm needs Adjusting, use two wrenches set. Pump is n't hard either but you have to take the top of a performer intake stock. Holley accelerator pump assembly that consist of the main discharge at idle and on the would! Your Holley Four-Barrel carburetor by Properly Adjusting the accelerator pump diaphragm arm and nozzle. Runs great and pump nozzle from underneath the car 600 to 650 carb yield! And on the bench know if the engine is moving from idle, much than! Gaskets, base plate edelbrock would be the same process as an AFB 9000, or hesitate Cure... Spirits ( odorless ) for all of our testing between 12-14 degrees of initial timing a! Voltage at.450 Volts and WOT at around.880-.930 Volts to start with timing, some., headers and a mild the road some may use only a check which! Motor pulls clean to 6K, haven & # x27 ; ll a... Come join the discussion about restoration, builds, performance, modifications, classifieds troubleshooting... At: fuel: 6psi but occasional run on, i can with. The center of the main discharge at idle i 've read this before when searching but no one says springs! Running great i 've read this before when searching but no one says executing all these will.
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