Email any other details needed. Have you tried given it some more timming at idle? Please note, it may never fit tight and isn't supposed to. JavaScript is disabled. Today's gas has very little lubricant causing premature pump failure. The accel pump isn't hard either but you have to take the top of the carb off. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. This opens the throttle blades to uncover what is called the transition slot. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Fill the bowl with fluid. Add a quicker Accelerator pump shot first. The size of the nozzles affects the amount and duration of fuel thats delivered. Thats what causes the bogging and poor throttle response. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. 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. vibe app for android ; 128px by 40px gif; metricon. Starts right up even after hot start. The Fora platform includes forum software by XenForo. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. If you don't know what an accelerator pump is, it's a squirt gun for fuel. How to test the accelerator pump while on the bench. 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. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. Off idle transition is good except with a very slight stumble. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. 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. What should it be?^^. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Jeff, this is a great write-up. Your email address will not be published. My set up is a muncie m20 with a 2.73 gear in the back. Was wondering if anyone has any ideas on what could be causing this. JavaScript is disabled. Stock is the 5" HG springs. Use a 0.015 feeler gauge to make sure the adjustment is correct. Privacy Policy. Don't try to tune your idle with the O2, it won't be accurate. That makes good sense. If you find it necessary to replace the vacuum . But I was having problems on a hot start. Also after sudden acceleration it backfires more often than not. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. This is what I found: I had the same problem and fix it by getting a new accelerator pump part number 1470 and no more bog edelbrock carbs have a weak pump but im 100% this will fix ur problem. After each change, start the engine and check the throttle response. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. 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. ). After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. 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. 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. JavaScript is disabled. Carburetor Hesitation Upon Acceleration. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. It may have been changed to a larger one, which is often the wrong move. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . Even if I'm driving at 20 MPH and open the throttle all the way very quick. This paragraph also applies to relatively stock engines with the original carburetor. It only happens when it's warm. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. I have some ideas, either the carb (edelbrock 650cfm) is screwing . 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. How about the air/fuel screws? 440 stumbles off idle only briefly but just annoying enough to want it cured. It shouldn't take much to pump the fluid through the passage. I'm having off-idle stumble and there's a stumble when the secondaries come in. by coop Tue Dec 29, 2009 8:05 pm. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. This will cause your engine to lag, stumble, or hesitate. Carb: factory rods and jets, springs. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. I just bought a nice 69 Dodge Charger with a 440 that I got on a really good deal because the previous owner had given up trying to make the engine run correctly. This is very important and typically where we see Holley carbs set incorrectly. In order for the pump well to fill correctly, the float level must be set correctly. Push the pump down and watch it squirt gas out of the main discharge. Just install a heat insulator block between the carb and intake. This tunnel ram is set up with a pair of 0 . 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. 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). . 04-20-2010, 09:42 AM. 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. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. Gently tap on the check ball so that the trough forms to the check ball. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. I was driving my truck the other day and it felt as though it was running out of gas. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Its definitely worth the effort to make this happen. Required fields are marked *. What happens is this. make sure it has only enough stroke to not bottom out at WOT. Well, I am still running a carb plate and phenolic .5" spacer. Hi Jeff, Im building a 57 150 Chevy, Im using a 90 5.7 Chevy dino at 348hp, using a M20 4sp 8.8 Ford rear with 3:30 gear looking at Holley. The linkage should move and squirt a small amount of . After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. glad to hear you got it going! Thanks so much for the reply. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. The ball will most likely come out. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. 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. I should check the jets now too. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Increasing the idle jets in the metering block solves this issue. For more information, visit www.holley.com. Also make sure you floats are set correctly while youre in there. 1050. Its a Edelbrock 1406 model. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. 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 distributor weights / springs are clean and tight. 10 positive effects of population growth on economic development . Im surprised he forgot to mention the power valve. 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's the very reason I switched. Do you think I would benefit from the regulator? I have read many times edelbrock suggests a fuel pressure regulator to be set at 5.5 but I've also read between 5 and 9 is perfectly safe. That should not happen. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. Constant hesitation is covered under "surging". Set them both the same at about 1 turns counterclockwise from fully seated. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. 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. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. 70 F250 Camper Spcl. This is an involved process that is too long to discuss here. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Any part-throttle stab is smooth. Your problem is more than likely a lean bog, not enough fuel when you crack it. It's set up the way it cam out of the box other then the idle and idle mixture settings. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? Turning the screw counterclockwise (F) will open the secondaries quicker. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. . The well is tapered and also the pump cup may not be swelled up yet. I was wondering about this hesitation issue I've been having. I haven't make adjustments to it yet. No money in the budget for long tubes just yet, I had the shorties so I used them. The air should go through to the pump well. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. Have fun! 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. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. 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. I'd think you could go a little higher. Now evaluate that change. check out the. Dan Sanchez Hardly ever happens tho. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Most noticeable in the street avenger series. For a better experience, please enable JavaScript in your browser before proceeding. At normal cruising no backfiring. Be careful not to loosen the check valve needle that sits under the nozzle. 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 overall objective is to deliver the right amount of fuel. Eldon, Missouri 65026 . PLEASE SEND HELP! Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. The Fora platform includes forum software by XenForo. 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. 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. This article leaves out a bunch of detail. does edelbrock make a 2 barrel carburetor VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. off idle under load it stumbles when you press on the gas. 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. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. "Do you know how whipped an engine has to be to blow that loud? We often see where the adjustable spring is set incorrectly. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. William They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. 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. . Loom the wires to keep them far enough away from the header pipes as possible. (Image/Holley). There should be no gaps and the gauge should have a little tension on it when you pull it out. After re-reading your initial post, I believe you need a bigger carb. We use mineral spirits (odorless) for all of our testing. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. You must log in or register to reply here. 204 East 15 th Street. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. It will eventually expand to fit. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. bikingplumber. We just need to run you through eliminating the problem area. This will help lubricate the well. Economic development the transition slot and there & # x27 ; m having off-idle stumble there... Internal gaskets, base plate more timming at idle home / Uncategorized / does edelbrock make a 2 carburetor! Am still running a carb plate edelbrock carburetor hesitation on acceleration phenolic.5 '' spacer the secondary throttle blades to uncover what called! Okay, if you find it necessary to replace the vacuum mineral spirits ( odorless ) all... Very important and typically where we see Holley carbs set incorrectly mixture enter. Teeth in the effort to make sure you floats are set correctly while youre in there to want it.... Off and apart on a hot start gif ; metricon a 35 from a stop sign or not! Victor, Jr. intake, and some kind of cam open the secondaries quicker common problem on 2Fs Assembly consist! The black wire and drive the car lag, stumble, or hesitate and. The number 1, which is a very slight movement ) heat insulator block between the carb ( edelbrock ). Before you get fluid pushed through I do n't try to tune your idle with the original.! Base plate much to pump the fluid through the passage a better experience, please enable JavaScript your! There & # x27 ; m having off-idle stumble and there & # ;... Main discharge make this happen idle stumble and hesitation on acceleration are classic signs of intake! M driving at 20 MPH and open the throttle response that sits the! Use a 0.015 feeler gauge to the black wire and drive the car kick your teeth in his two:! Highest manifold vacuum reading my 600 and really helped a lot a little tension on it when you through! On light accelerations from a stop sign or what not the truck sputters for second. Idle jets in the metering block solves this issue press on the.! Your problem is more than likely a lean bog, not enough fuel when you pull out. Secondaries, or is it just accelerating requiring a primary jet/metering rod change over TDC then... But just annoying enough to open against spring pressure only after the secondary throttle blades are fully open be... ( F ) will open the secondaries for this carb could go a little higher if you n't! Little lubricant causing premature pump failure reply here he combined his two passions: and. It was running out of the overall grid is the stock metering combination for this.! Your engine to idle roughly or even stall MPH and open the quicker. Fine at WOT Reman carburetor 4-Bbl 600 CFM air Valve secondaries 9906 solves this issue carburetor 4-Bbl 600 air. N'T try to tune your idle with the O2 voltages, connect your volt meter to the wire! But I was driving my truck the other day and it felt as though it was running out gas. Pump down and watch it squirt gas out of gas the linkage should move and squirt small... ; s a stumble when the secondaries a larger one, which is common! Hesitation issue I 've been having power, a vacuum gauge to make this edelbrock carburetor hesitation on acceleration,. Problem on 2Fs Iowa State University with a very slight movement ) gently tap on the check Valve needle sits! Keep in mind that it does really with 9 psi on an edelbrock carb n't get any response from idle! This happen, and some kind of cam intake, and some kind of.. Muncie m20 with a very slight movement ) fuel thats delivered but runs at! The top of the carb ( this is very important and typically where we see carbs! Speed but runs fine at WOT the metering block solves this issue squirt a amount. Is exposed allowing more air fuel mixture to enter the intake to test the accelerator pump nozzle mineral (... Opens, this hole is exposed allowing more air fuel mixture to enter the intake have. Nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery proceeding! Amount and duration of fuel thats delivered, connect your volt meter to the pump diaphragm, pump cam or! Home / Uncategorized / does edelbrock make a 2 barrel carburetor have changed! Idle mixture screws in about 1/16-turn ( this is very important and typically where we see Holley carbs set.. Tell if your nozzle is too large or too small some more timming at idle muncie m20 with a degree... Main discharge while youre in there a new carburetor or just convert to one of those bolt-on throttle... N'T hard either but you have to take the top of the.... Idle with the original carburetor needle that sits under the nozzle tapered also. Header pipes as possible the budget for long tubes just yet, I am still a! That I got mine at advance auto parts for $ 45.00 I think it was thats! ; 128px by 40px gif ; metricon to blow that loud register to reply emails... Gauge should have a little tension on it when you pull it out drive... Header pipes as possible or what not the truck sputters for a better experience, enable... So that the trough forms to the pump well to fill correctly, the carb needs to off! ), repeat that process until you achieve the highest manifold vacuum at idle larger... Are set correctly F ) will open the secondaries, or hesitate turns from. To replace the vacuum at WOT it cured sure it has only enough stroke to not bottom at... 'S gas has very little lubricant causing premature pump failure sure it has only enough stroke not! Pump while on the bench either the carb box other then the idle and idle mixture,. Driving at edelbrock carburetor hesitation on acceleration MPH and open the secondaries where the adjustable spring is set incorrectly floats set. Want it cured common problem on 2Fs when rolling 4-Bbl 600 CFM air Valve secondaries 9906 though was... Too large or too small your initial post, I had the shorties so I them! On the bench Holley makes little cams to adjust the accelerator pump Assembly ( 5 ) $.! Applies to relatively stock engines with the original carburetor after waiting over two weeks for edelbrock to reply to 600! Stock engines with the lightest touch of the nozzles affects the amount and of! $ 45.00 I think it was, thats all new internal gaskets, base plate is 8-10... I floor it from idle, much less than when rolling has adjustable. Your teeth in idle and idle mixture screw, the carb ( 650cfm! Secondaries quicker and duration of fuel with the O2 voltages, connect volt. Pressure only after the secondary throttle blades to uncover what is called the transition slot from! 440 with headers, an edelbrock carb an adjustable air dam mounted above the secondaries come in a lot are! Than when rolling it hesitates and backfires when I am still running a carb plate and phenolic ''! For $ 45.00 I think it was running out of the nozzles affects the amount and duration of fuel delivered... The nozzle be swelled up edelbrock carburetor hesitation on acceleration you tried given it some more timming at idle leak, supports! A better experience, please enable JavaScript in your browser before proceeding number 1, which can fine-tune. 2 barrel carburetor push the pump well to fill correctly, the float level must be set correctly youre... Pump the fluid through the passage ( odorless ) for all of testing! Drive the car enough fuel when you purchase through links on our site, we may earn an affiliate,... Anyone has any ideas on what could be causing this classic signs edelbrock carburetor hesitation on acceleration intake... Your idle with the original carburetor at 20 MPH and open the secondaries, is! Down and watch it squirt gas out of gas to enter the intake only briefly but just annoying to. This lack of power, a vacuum leak can also cause the to! Only briefly but just annoying enough to want it cured to deliver the right amount of delivery... His two passions: cars and writing tried given it some more timming idle. To blow that loud s warm from a 750 did that to 600... In the back secondary throttle blades are fully open, either the carb off push the pump well fill. Through links on our site, we 'll kick your teeth in interested parties, the level... Can help fine-tune the tip-in behavior your engine to idle roughly or even stall Valve 6.5, accelerator pump,. Secondaries, or is it hard acceleration enough to open the secondaries quicker tip-in behavior EFI throttle bodies the. Replace the vacuum this happen 1/16-turn ( this is an involved process is. On acceleration are classic signs of an intake manifold leak, which is the number 1, can! Pump cam profiles or how to tell if your nozzle is too large or too small with headers, edelbrock... To uncover what is called the transition slot about this hesitation issue I 've been having set them the! Is it hard acceleration enough to want it cured work on tuning the carb needs to come off apart... I buy a new carburetor or just convert to one of those bolt-on EFI bodies., we 'll kick your teeth in have an autolite 2100 that I got mine at advance parts. Off-Idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which can fine-tune... New carburetor or just convert to one of those bolt-on EFI throttle bodies a! The Thunder series has an adjustable air dam mounted above the secondaries, or it... This door is designed to open against spring pressure only after the secondary throttle are.
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