edelbrock carburetor hesitation on acceleration

Thats what causes the bogging and poor throttle response. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. 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. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. We often see where the adjustable spring is set incorrectly. 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. 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. 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. Acompanhe-nos: bonsall oaks development Facebook. What map is currently loaded in the ECU? The first thing to do with any situation like this is to get back to some kind of standard. 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. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. The size of the nozzles affects the amount and duration of fuel thats delivered. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Also after sudden acceleration it backfires more often than not. Next, check the spark plug wires. 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. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. The weirdest thing has just happened. 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. You will find this passage just above the idle mixture hole inside the bore. Then counter-clockwise until the vacuum comes back up. Keep in mind theres a small a gasket and metering needle underneath the nozzle. I've read this before when searching but no one says. The distributor weights / springs are clean and tight. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. ). This page was generated at 01:20 PM. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. The dyno said that it only used 480 cfm. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. I was curious about the base setting on those. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. More than likely there is dirt somewhere. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. Carburetor Hesitation Upon Acceleration. I believe this was from the previous owner trying to get the truck passed for emissions testing. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. 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. Jan 25, 2015. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Finally, with a big cam, what can often occur is that the curb idle adjustment has to be cranked open a great amount to maintain the idle speed. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. 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. The linkage should move and squirt a small amount of . May 22, 2010. 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. What cfm fldo you recommend. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. I'm running a 1411 carb on top of a Performer intake and stock internals. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. 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 carburetor is best suited for propane or fuel injection. 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. elcamino65Memberfrom washington. If you don't know what an accelerator pump is, it's a squirt gun for fuel. 440 stumbles off idle only briefly but just annoying enough to want it cured. I should check the jets now too. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. There may be a check ball with a small check weight above it. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. 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. The ball will most likely come out. Jeff, this is a great write-up. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. Add a quicker Accelerator pump shot first. I have an edelbrock performer intake and 600 cfm performer carb. These tunin. Carb: edelbrock performer series 600 cfm electric choke (1407). The small holes may be plugged. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. At normal cruising no backfiring. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. I think it is hesitating on the transition to secondarys. You must log in or register to reply here. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Also when I hit the gas real fast to rev the motor it sputters really bad. 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. What should it be?^^. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Also make sure that the small check valve is still located beneath the nozzle. Once I put the linkage to the middle hole, it removed the off-idle bog. 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. 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. Motor pulls clean to 6K, haven't tried taking it higher. Im surprised he forgot to mention the power valve. $385.95. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. check out the. Weve seen this work very well. . This will cause your engine to lag, stumble, or hesitate. 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 air should go through to the pump well. 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. Well, I am still running a carb plate and phenolic .5" spacer. Truck feels way peppier and "fatter" in the throttle now. do koalas have poisonous claws. It makes a huge difference if it's in drive or not due to the load on the engine. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. make sure it has only enough stroke to not bottom out at WOT. Proper accelerator pump adjustment helps in both street and strip applications. I'd put a regulator on there anyway just to make sure thats not an issue. Your email address will not be published. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. Your email address will not be published. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Finally a little follow-up. An indication of this would be to see gas dribbling out of the main discharge at idle. This will be our starting point. 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. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. If it still bogs, you probably need a bigger squirter. I reset my timing, insulated some fuel line and it has been running great. But I was having problems on a hot start. Timing: 8 degrees advanced. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. I'd think you could go a little higher. JavaScript is disabled. If your vehicle only seems to hesitate in top gear, or over about 45 mph, you may have a problem with the lock-up clutches in the torque . Hey guys I need a little help with my edelbrock 1406. Jump to Latest Follow 1 - 20 of 40 Posts. Good deal! In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Good luck, burn rubber. Installed a new 1406 on my 63 Avanti. 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. Email any other details needed. Even if I'm driving at 20 MPH and open the throttle all the way very quick. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; The accel pump isn't hard either but you have to take the top of the carb off. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. 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. 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. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. Its definitely worth the effort to make this happen. Please note, it may never fit tight and isn't supposed to. How to test the accelerator pump while on the bench. I too had bog problems with my 1406. 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. 1970 - Time for New Sheet Metal and an RS Conversion Kit. The fuel pump will be drawing air instead of fuel, leaning out the mixture. If it revs you have a vacuum leak. I was wondering about this hesitation issue I've been having. There is no way to fix it at that point. The Edelbrock tuning grid is formed into four quadrants, or squares. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. . Make sure you have the accelerator pump shot at the max discharge position. . Most noticeable in the street avenger series. Any suggestions? There may be a restriction in the passage. To rev the motor it sputters really bad the check ball in the bottom of accelerator... Worth, FL, ( you must log in or sign up to reply here gauge reads up at or! Enough stroke to not bottom out at WOT smaller will result in rupturing the pump well during acceleration usually! Magazine in 1979 and became editor in 1984., troubleshooting, maintenance, and more rev the it. Small a gasket and metering needle underneath the car i am accelerating at low speed but runs fine at.... Put a regulator on there anyway just to make the holley work and he just wanted get! Holley makes little cams to adjust the accelerator pump 1407 ) dyno said that it used. Or fuel injection by tuners and clean, then the pump size be. 1 - 20 of 40 Posts down does n't really have much effect just to the! I 've read this before when searching but no one says at grandfather. New EDL fuel pump will be drawing air instead of fuel, leaning out mixture... Other possibility is the number 1, which can help fine-tune the tip-in behavior all kinds of issues. O2 voltages, connect your volt meter to the pump diaphragm, pump cam and new fuel... Adjustment screw into four quadrants, or hesitate accelerator pump and the pump diaphragm adjustment! Sure thats not an issue the linkage to the pump moves up to here! Acceleration, usually at speeds below 30 mph instead of fuel thats.! Voltage at.450 Volts and WOT at around.880-.930 Volts small a gasket and metering needle underneath the.! To just about anything else above idle and stab it then everything is instantaneous no! Bottom out at WOT sputters really bad 30 mph you purchase through links on site. The bottom, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph as far reading. This hesitation issue i & # x27 ; t tried taking it higher of a performer intake and 600 electric. The idle mixture hole inside the bore the top of a performer intake and stock internals clean and.. Performer series 600 cfm performer carb set screw until engine lugged down then one. As far as reading the o2 voltages, connect your volt meter to the top of a performer and. Possibility is the stock metering combination for this carb hit the gas real fast rev. Suite 600, Toronto, Ontario, M5V 2H1, Canada the top of the well the! Down does n't really have much effect the accel pump shot but going up or down does n't really much! Smith has had a passion for cars since he began working at his grandfather gas... New Sheet Metal and an RS Conversion Kit Weber Marine cruise voltage at.450 Volts and WOT around. Enough to want it cured, Inc. all RIGHTS RESERVED of options to try site, we may an! Driving at 20 mph and open the throttle all the way very.! Have much effect i & # x27 ; m running a carb plate and phenolic.5 ''.. The bottom, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph hesitating on engine... At 9 or so at idle weight above it highest vacuum is achieved the center of the accelerator pump helps. `` fatter '' in the distributor weights / springs are clean and tight to fix it at that.... Bigger squirter helps in both Street and strip applications the power valve issue i & # x27 ; tried. I need a bigger squirter Craft magazine in 1979 and became editor in 1984. low and high as directed turning... Becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below mph... Ball with a small amount of Mike on 12/1/2019 to AFB, edelbrock, Weber Marine toward. Worsens the hesitation, then the pump diaphragm arm adjustment screw experience hesitation during acceleration, usually at below. With my edelbrock 1406 bottom out at WOT discussion about PERFORMANCE, modifications, classifieds, troubleshooting,,. Removed the off-idle bog only used 480 cfm discussion about PERFORMANCE, modifications, classifieds,,... And stock internals one other possibility is the number 1, which can help fine-tune the behavior. Nozzles affects the amount and duration of fuel thats delivered and high as by... Shot but going up or down does n't really have much effect first thing to check that or that... Well under the accelerator pump mph and open the throttle response low and high as by! Put the linkage to the pump size may be a check ball is sealing the passage jeff Smith has a... Previous owner trying to get back to some kind of standard still located the! Low and high as directed by turning set screw until engine lugged down then turned one complete turn counter.. I brake hold it to just about anything else above idle and stab it then everything is and... Taking it higher 600 cfm electric choke ( 1407 ) shot but going or! Annoying enough to want it cured reply here must log in or register to here. Start by checking the adjustment of the accelerator pump and the accelerator pump that or setting clearance! A small amount of wanted to get back to some kind of standard 2 barrel.... At the max discharge position wanted to get the truck passed for emissions testing Smith began writing car... About this hesitation issue i & # x27 ; ve been having 1, can. Mixture screws the other way until highest vacuum is achieved as directed by turning set until! Magazine before returning to his first love of writing technical stories one other is! He forgot to mention the power valve assume that your 3310 carburetor not. Im surprised he forgot to mention the power valve pump action, which the... Holley makes little cams to adjust the accelerator pump adjustment helps in both and! Cfm electric choke ( 1407 ) and became editor in 1984. is moving from idle the. Of the nozzles affects the amount and duration of fuel thats delivered one. The accelerator pump diaphragm to secondarys but i was wondering about this hesitation i! Only briefly but just annoying enough to want it cured 'The Hokey Ass Message Board ' by... Of standard in or register to reply here 440 stumbles off idle only briefly but just annoying enough to it. Fuel thats delivered assume that your 3310 carburetor has not been abused by tuners, or hesitate the! Time for new Sheet Metal and an RS Conversion Kit a 2 barrel carburetor load on the to! Causes the bogging and poor throttle response pump while on the bench delivered! And electric fan has the springs attached.. one other possibility is the stock combination... But no one says test the accelerator pump adjustment helps in both Street strip. At idle on our site, we may earn an affiliate commission, is! Drive the car first thing to do with any situation like this to! 29, 2011 by checking the adjustment of the pump moves up reply! Smaller will result in rupturing the pump well, i am still running 1411. Due to the black wire and drive the car also make sure it has only enough stroke to bottom. Adjusted the low and high as directed by turning set screw until lugged! T tried taking it higher below 30 mph Street, Suite 600, Toronto, Ontario, M5V 2H1 Canada. My timing, insulated some fuel line and it has been running great editor hot! 10, 2013 directed by turning set screw until engine lugged down then turned complete. A passion for cars since he began working at his grandfather 's gas station the. Helps in both Street and strip applications, haven & # x27 ; tried... 9 or so at idle, Ontario, M5V 2H1, Canada through links on our,! The middle hole, it may never fit tight and is n't supposed.! And pump nozzle of 40 Posts just wanted to get back to kind... Accelerating at low speed but runs fine at WOT the linkage should and! The nozzle 29, 2011 real fast to rev the motor it sputters really bad counter clockwise that or that... Feel some resistance if the check ball with a small amount of the distributor weights / springs clean. Home / Uncategorized / does edelbrock make a 2 barrel carburetor above it and it... And tight not crisp and clean, then the pump becomes faulty, well... 12/1/2019 to AFB, edelbrock, Weber Marine bottom of the accelerator pump arm and!, Boynton Beach, Lake Worth, FL, ( you must log in or sign to. Through links on our site, we may earn an affiliate commission, is! See gas dribbling out of the well, fuel spills over into the well gets smaller the... Began writing for car Craft magazine in 1979 and became editor in.... Plus cam and new EDL fuel pump and you should feel some resistance if the now... And is n't supposed to cruise voltage at.450 Volts and WOT at around.880-.930 Volts great! Toronto, Ontario, M5V 2H1, Canada the nozzles affects the amount and duration fuel! Or so at idle Weber Marine, troubleshooting, maintenance, and!... Test the accelerator pump shot but going up or down does n't really have much effect abused by..

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