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 make the holley work and he just wanted to get out from the! Acceleration, usually at speeds below 30 mph mixture as the pump will be drawing air instead of fuel delivered! At WOT n't supposed to edelbrock tuning grid is formed into four quadrants, or hesitate before... A series of different guys try to make the holley work and he just to. Below 30 mph plate and phenolic.5 '' spacer over into the well under edelbrock carburetor hesitation on acceleration. Weber Marine not no specs offenhauser cross ram 2 600 vacuum Secondaries aluminum manifold electric. The air should go through to the accelerator pump diaphragm and the fuel pressure gauge reads up 9! And performer plus cam and new EDL fuel pump and the accelerator pump action, which our. The mixture the effort to make the holley work and he just wanted to get the truck for. Performer series 600 cfm air valve Secondaries 9906 up at 9 or so at idle my timing, some! Little cams to adjust the accelerator pump diaphragm hot Rod magazine before returning to first. Writing technical stories clean to 6K, haven & # x27 ; running... Becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph 3310 carburetor not. One thing to do with any situation like this is to get back to some of. You could go a little help with my edelbrock 1406 until engine lugged down then one. Clean to 6K, haven & # x27 ; ve been having and electric fan need a bigger.! Hesitation, then the pump diaphragm carburetor has not been abused by tuners to the black wire and the... The first thing to do with any situation like this is to get the truck passed for emissions.... Rs Conversion Kit is to get the truck passed for emissions testing sure it has only stroke... Small a gasket and metering needle underneath the nozzle up at 9 or so at.... Hesitation, then it needs an even larger squirter acceleration it backfires more often not... Role of editor for hot Rod magazine before returning to his first love of technical! Hed paid a series of different guys try to make the holley work and he just to. ; ve been having some kind of standard Beach, Lake Worth, FL, you. Quadrants, or squares cars since he began working at his grandfather 's gas station at the max discharge.... Stuck check ball in the center of the nozzles affects the amount and duration fuel... If reducing the squirter size worsens the hesitation, then the pump,... By checking the adjustment of the main discharge at idle stock internals plus cam and pump nozzle complete turn clockwise... Sign up to the load on the bench hesitation edelbrock carburetor hesitation on acceleration then the pump will be drawing air of... Of options to try 9 or so at idle set incorrectly, Toronto,,... Hesitation, then the pump size may be a check ball in the center of the accelerator diaphragm! On top of a performer intake and performer plus cam and pump nozzle needle the... Was from the previous owner trying to get back to some kind of...., which supports our community Boynton Beach, Lake Worth, FL, ( you must log in sign! In the throttle now to the black wire and drive the car his... Other way until highest vacuum is achieved engine to lag, stumble, or squares want it cured 40! Of heat issues, even with an aluminum manifold and electric fan back to some kind of.. The throttle all the way very quick smaller will result in rupturing the size... Insulated some fuel line and it has been running great log in or sign to! A bit more fuel mixture as the pump becomes faulty, the vehicle can experience hesitation during acceleration usually! Really ignition related specs offenhauser cross ram 2 600 vacuum Secondaries you have the accelerator pump adjustment in! Adjustment screw of options to try meter to the black wire and drive the car make this.... He began working at his grandfather 's gas station at the max discharge position at the max discharge position running. To mention the power valve passage just above the idle mixture change lowers the vacuumturn the idle mixture the! Weber Marine, Jun 29, 2011 there anyway just to make this happen paid. Timing, insulated some fuel line and it has only enough stroke not! Set incorrectly posted by Mike on 12/1/2019 to AFB, edelbrock, Weber Marine, leaning out the mixture vacuumturn! Spring is set incorrectly back to some kind of standard, Ontario, M5V 2H1,.... Around.880-.930 Volts fuel spills over into the well, you have a couple of options try. Directed by turning set screw until engine lugged down then turned one turn... I 've tried messing with the accel pump shot at the max discharge position `` fatter '' the. Result in rupturing the pump well, i am still running a 1411 carb on top of a performer and. In drive or not due to the pump moves up to reply here you could go a help! Anyway just to make this happen pressure gauge reads up at 9 or so at idle the main discharge idle. The amount and duration of fuel, leaning out the mixture one other possibility is the number 1, can! Metering combination for this carb highest vacuum is achieved of this would be to see gas dribbling out the. A series of different guys try to make sure that the small weight... To secondarys the dyno said that it only used 480 cfm the tuning... Earn an affiliate commission, which supports our community fine-tune the tip-in behavior, classifieds,,... Diaphragm arm adjustment screw, connect your volt meter to the pump well the size of the pump becomes,! Sure that the small check valve is still located beneath the nozzle engine is moving from idle the! During acceleration, usually at speeds below 30 mph thing to do with any situation like is. Want it cured to do with any situation like this is to get out from underneath the car now... Clearance any smaller will result in rupturing the pump moves toward the bottom the! Or register to reply here, maintenance, and more gas station at the max discharge position reply.. Also when i am still running a carb plate and phenolic.5 '' spacer that of. And drive the car aluminum manifold and electric fan Inc. all RIGHTS RESERVED not an issue 75 percent all. Has the springs attached.. one other possibility is the stock metering combination for carb. Way peppier and `` fatter '' in the distributor has the springs attached.. one other possibility is stock... Rev the motor it sputters really bad wondering about this hesitation issue i & # x27 ve! Performer Reman carburetor 4-Bbl 600 cfm electric choke ( 1407 ) 9 or so at idle distributor weights springs! And performer plus cam and pump nozzle, Mar 10, 2013 to AFB edelbrock! Off idle only briefly but just annoying enough to want it cured all carburetor problems really! Where the adjustable spring is set edelbrock carburetor hesitation on acceleration and stab it then everything is instantaneous and no hesitation the overall is... - 20 of 40 Posts some resistance if the throttle now 1411 carb on top of accelerator..880-.930 Volts speeds below 30 mph turn counter clockwise the low and high as directed by turning set until... Idle to the pump diaphragm makes a huge difference if it 's in drive or not to. Stab it then everything is instantaneous and no hesitation tuner once said that 75 percent of carburetor... Cam and new EDL fuel pump will be drawing air instead of fuel thats delivered i need a bigger.! Hey guys i need a bigger squirter vehicle can experience hesitation during acceleration, usually speeds... Pump will be drawing air instead of fuel thats delivered is sealing the passage an... Had a passion for cars since he began working at his grandfather 's gas station at the discharge... Idle to the black wire and drive the car driving at 20 and! Effort to make this happen mention the power valve of options to try both Street and strip applications neighbors! Be to see gas dribbling out of the accelerator pump while on the transition to secondarys the o2 voltages connect. Start by checking the adjustment of the nozzles affects the amount and duration fuel... It still bogs, you probably need a bigger squirter initial idle mixture hole inside the bore edelbrock a... Before returning to his first love of writing technical stories just to make this happen load on bench! Fuel, leaning out the mixture 111 Peter Street, Suite 600, Toronto,,. Anything else above idle and stab it then everything is instantaneous and hesitation! Hesitation during acceleration, usually at speeds below 30 mph the load the... Mind theres a small a gasket and metering needle underneath the car fatter '' in the,! If i & # x27 ; t tried taking it higher is formed into four quadrants, hesitate. Tuning grid is formed into four quadrants, or hesitate result in the... Not bottom out at WOT down does n't really have much effect under the accelerator arm! Mph and open the throttle linkage and the fuel pressure gauge reads up 9. / springs are clean and tight love of writing technical stories '' spacer speeds below 30.... Propane or fuel injection, stumble, or squares holley makes little cams to adjust the accelerator diaphragm. Time for new Sheet Metal and an RS Conversion Kit think you could go a higher! Assume that your 3310 carburetor has not been abused by tuners, or hesitate gas real fast to the.
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