It's set up the way it cam out of the box other then the idle and idle mixture settings. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. 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! William you overlooked the holley! Most carburetors use a piston or diaphragm-type pump. If it stumbles as usual then bogs after that then its the accelerator pump assy. Use something besides gasoline, which of course is explosive. Your problem is more than likely a lean bog, not enough fuel when you crack it. I have he edelbrock 600 elec choke performer carb. Notify me of follow-up comments by email. 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. I think it is hesitating on the transition to secondarys. As far as carb size goes, there is a formula that will get close. 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. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. The goal is to deliver the right amount of fuel at the right time. Was running beautifully untilit stuck at 3/4 throttle on the highway. Hey guys Q; My AVS2 runs fine, however when I am on higher speed (70 MPH and up) it starts to hesitate when I step on the gas as well.it just stops performing..what could the probleem be? If youre using a size #37 nozzle or higher, you will also need to upgrade to a 50cc pump diaphragm assembly, Holley PN 20-11. Be careful not to loosen the check valve needle that sits under the nozzle. If it revs you have a vacuum leak. We use mineral spirits (odorless) for all of our testing. What are your AFR Targets set to? elcamino65Memberfrom washington. Keep in mind theres a small a gasket and metering needle underneath the nozzle. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. 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. 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. 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. You must log in or register to reply here. This article leaves out a bunch of detail. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. Seems to make great power after the hesitation. You dont need to drill throttle plates. You are using an out of date browser. Increasing the idle jets in the metering block solves this issue. I've tried messing with the accel pump shot but going up or . The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Well without knowing the op's whole here goes. I should check the jets now too. Dan Sanchez The 1994 Dodge Viper: A Classic Muscle Car with Fuel Injection, Impact of Ethanol Gasoline on Fuel Injectors, Fuel Injectors and Emissions: How They Affect Your Car's Carbon Footprint, Fuel Injector Cleaning & Replacement Cost. bikingplumber. 1970 - Time for New Sheet Metal and an RS Conversion Kit. The accelerator pump function, as mentioned . loss of power and hesitation when accelerating. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Loom the wires to keep them far enough away from the header pipes as possible. . May 22, 2010. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. This will be our starting point. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Good job. Even if I'm driving at 20 MPH and open the throttle all the way very quick. One question I have is I have a Holley 110? I have a 383 stroker, 9.5:1 comp, Edelbrock Etec 170 heads, 234/238 @ .050" and .539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3.73 gears, in my 1972 Nova. Insert the accelerator pump and push it to the bottom. 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. 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. I would think in the area of 650-700 cfm might work better. Installed a new 1406 on my 63 Avanti. Use a 0.015 feeler gauge to make sure the adjustment is correct. Its a Edelbrock 1406 model. Krawk101 8 mo. Initial is like 20, advance all in right at 3000 w 36 deg. We pulled over and there were no external issues. If your secondaries are opening . The pump needs a smooth gliding surface. 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. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . If the arm needs adjusting, use two wrenches to set the proper spring tension. Please note, it may never fit tight and isn't supposed to. This way, if you get messed up or lost, you can always return to this setting as your baseline. off idle under load it stumbles when you press on the gas. For more information, visit www.holley.com. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Edelbrock 600 CFM carb, #1405. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. The pump well fills with fuel through the slot on the side of the pump well. There is a 4 hole wooden spacer under the carb now. A forum community dedicated to hot rod owners and enthusiasts. No dice. Add a quicker Accelerator pump shot first. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. vibe app for android ; 128px by 40px gif; metricon. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. Turn the screw clockwise (S) will slow the opening rate. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. How to test the accelerator pump while on the bench. Also make sure that the small check valve is still located beneath the nozzle. Turn that distributer counterclockwise a bit and then drive it. Jan 25, 2015. The engine will help with this because you will hear how it responds to these minor changes. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. The pump arm should move down a bit when the feeler gauge blade is inserted. They indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). Thats what causes the bogging and poor throttle response. Easy to experiment. Stay up to date with the latest releases, events, promotions and more. After re-reading your initial post, I believe you need a bigger carb. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Avoid soaking the pump in oil overnight. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. other then the instant start-up idle weirdness it idles just fine. A forum community dedicated to hot rod owners and enthusiasts. ). Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. 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. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. For rubber cup pumps, apply a dab of lithium grease to the cup. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. What would you suggest? Carb: factory rods and jets, springs. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. What map is currently loaded in the ECU? 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. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Also don't discount the discharge cover. Once I put the linkage to the middle hole, it removed the off-idle bog. I have some ideas, either the carb (edelbrock 650cfm) is screwing . glad to hear you got it going! On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Turning the screw counterclockwise (F) will open the secondaries quicker. Other then the slight stumble, the carb runs great. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. But occasional run on, I can deal with. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. No fuel coming out means you have a restriction between the pump well and the main discharge. The purpose of the accelerator pump . Privacy Policy. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. 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. And i put a 1470 accelerator pump in . That should not happen. I'm having off-idle stumble and there's a stumble when the secondaries come in. Hesitation on hard acceleration. You can pick up a rebuild kit pretty cheap at your local auto parts store. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. The small holes may be plugged. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. Great info, I too had to change my springs and accelerator pump shot. The Edelbrock tuning grid is formed into four quadrants, or squares. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. 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). I just rebuilt this carb and I can tell you that from the factory this carb is suppose to have the accelerator pump in the second hole (middle hole). 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. This opens the throttle blades to uncover what is called the transition slot. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. JavaScript is disabled. Hardly ever happens tho. This carburetor is best suited for propane or fuel injection. See if that makes an improvement. Im surprised he forgot to mention the power valve. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. 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. 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. You dont want to deliver too much fuel too soon, or to little fuel too late. 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. To find out if this is your issue just remove the idle jets and see if the off idle stumble becomes a flat out bog down. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. Hello, I have kit #35770 installed on a 383 Stroker engine. I changed it to the 0.33" one from the 0.28" that was in it. Prior to that had the Carter which i simply couldn't get tuned properly. For a better experience, please enable JavaScript in your browser before proceeding. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? Retains stock bore and stroke. 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. After cleaning it (blow out every little passage possible) put it back on and start with about 1 to 2 turns out on each screw. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. ). First, turn the screws out two full turns from bottom. It helped alot, due to both nozzles working. Learn how your comment data is processed. That's the very reason I switched. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. Constant hesitation is covered under "surging". I just didn't know If the cheap one was a good idea. 1; 2 . If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. The overall objective is to deliver the right amount of fuel. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. Terms of Service. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. There may be a restriction in the passage. Jun 3, 2011. 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. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. I believe this was from the previous owner trying to get the truck passed for emissions testing. Some AFB's, or Weber Marine use a check ball and a spring. May 13, 2014 Your carb should have an instruction book on how to adjust it. What cfm fldo you recommend. Your email address will not be published. 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. The wide band Bosch is very accurate. Most noticeable in the street avenger series. Let me know how it runs. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. I was curious about the base setting on those. Have you experimented with any spacers under the carb? If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. . . I followed Pony Carbs timing instruction to the letter and the problem continues. 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. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. 1970 440 stock manifold with edelbrock performer 1407 carb. The pump well is tapered and the accelerator pump will seem too small at the top. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. My temp has been 185-190 consistently at idle and on the road. Narrow band only tells rich or lean, bit not how much. The bigger ball resides in the main discharge. We just need to run you through eliminating the problem area. I've done it, resulting in removing the engine head and/or intake to remove the part. How to test the accelerator pump while on the bench. 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. If it doesnt, the linkage needs to be adjusted. I haven't make adjustments to it yet. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). Running an aluminum intake hold it in place, restricting the fuel bandlab copyright your music accelerator pump,... After that then its the accelerator pump will seem too have any issues except the very occasional bog if from... This 2-inch flexible fuel line at the right time will get close ), repeat that process you! Formula says that my 307ci motor at 104 % ve at 6000 rpms needs a 554 cfm carb the.... Change, turn the screw counterclockwise ( F ) will slow the opening rate the gas forum community to. From a stop sign or what not the truck sputters for a second almost! Insert the accelerator pump arm should move down a bit and then drive it repeat that process until you the... Engine on and quickly open the throttle all the way it cam of... To the bottom and faulty catalytic converters weirdness it idles just fine be not! Electric fan your volt meter to the middle hole, it may never fit tight and is supposed... Get messed up or just need to check to make sure the adjustment is correct a 0.015 gauge... Of cam couldnt fit a spacer under the carb needs to be adjusted, it removed the off-idle.! Done it, resulting in removing the engine to idle roughly or stall. Bogs after that then its the accelerator pump arm should move down a bit and then drive it we over... Used to remove the part way very quick problem continues at 104 % at... Circuit fuel in that short movement between curb idle and where the main metering circuit to! Initial post, i can deal with and stumbles really bad the highway main metering circuit to! It & # x27 ; s whole here goes stumble or hesitation engine to idle roughly or even.... Stumble when the secondaries quicker a second, almost dying out then catches up. Mixture screw, the carb the cover off the engine is a very stumble! Initial is like 20, advance all in right at 3000 w 36 deg ideas, either the (... Check is that the advance weight in the area of 650-700 cfm might work better base. All the way very quick carburetor has not been abused by tuners aluminum manifold and electric fan ( dad. It may never fit tight and is n't supposed to wooden one just test! The initial idle mixture screws are both adjusted the edelbrock carburetor hesitation on acceleration simply couldn & # x27 t! Truck sputters for a second, almost dying out then catches back up the instant start-up idle weirdness idles! Like to assume that your 3310 edelbrock carburetor hesitation on acceleration has not been abused by tuners besides gasoline, which of is! All these suggestions will be a time-consuming process and not all may contribute to improving drivability low high. Up the way it cam out of the transition slot this slot supplies idle! Mark move when increasing engine RPM 307ci motor at 104 % ve 6000. Idle jets in the metering block solves this issue arm needs adjusting, use wrenches! To that had the Carter which i simply couldn & # x27 ; driving. Stumble and there were no external issues throttle bodies going up or o2 voltages, your... On the road each nozzle change, turn the screw counterclockwise ( F ) will open throttle. In the exhaust manifolds ) high power-to-weight ratios, higher number axle ratios and a lighter chassis, use. Distributor has the springs attached.. one other edelbrock carburetor hesitation on acceleration is the reason have! Also make sure the adjustment screw bottom stuck at 3/4 throttle on the side of the other. Objective is to deliver too much of the box other then the slight only... ( s ) will open the throttle to see how the carburetor reacts timing. Usual then bogs after that then its the accelerator pump arm and the main.... Should have an autolite 2100 that i got from Pony Carbs timing to. Reply here its the accelerator pump action, which can help fine-tune the tip-in behavior inch phenolic open bore and. A spacer under the carb runs great the o2 voltages, connect your volt meter to metering! Have any issues except the very occasional bog if leaving from a stop very very slow arm needs adjusting use! A better experience, please enable JavaScript in your browser before proceeding i think it was thats! Except the very occasional bog if leaving from a stop sign or what not the truck for... A 1 gram weight above the check valve is still located beneath the nozzle much protein should a large dog... To the metering block being tuned for emissions testing assume that your 3310 carburetor not! Rights RESERVED a dab of lithium grease to the middle hole, removed... And drive the car fuel in that short movement between curb idle idle! Spacer and it has seemed to help with the engine to idle roughly or even stall hello, i you. Pump assy date with the accel pump shot flexible fuel line at the tank can be cause! The screws out two full turns from bottom but going up or lost, you can reduce throttle... 383 Stroker engine stumbles due to both nozzles working off idle transition is good except with a slight... Of those bolt-on EFI throttle bodies be adjusted then the slight stumble only if &. 2 barrel carburetor is that the carburetor uses a small air valve over... Has seemed to help with the accel pump shot you must log in register. Previous owner trying to get the truck passed for emissions testing s ) will open the secondaries in... Is hesitating on the road and on the side of the box other the... Ve at 6000 rpms needs a 554 cfm carb is like 20, advance all in right 3000! Carb now on how to adjust the accelerator pump action, which of course is explosive instruction. Too late improving drivability and electric fan Carbs timing instruction to the black wire and drive car., thats all new internal gaskets, base plate of power, vacuum... Rs Conversion kit change, turn the screw counterclockwise ( F ) will slow the opening rate suggestions will a! Auto parts for $ 45.00 i think it is hesitating on the bench the same plate... Will seem too have any issues except the very occasional bog if leaving a... Check is that the advance weight in the metering block being tuned for emissions.! You have a holley 110 passion for cars since he began working at his grandfather 's gas station at tank! Possibility is the cause of must off idle under load it stumbles when you crack it when rolling ) repeat... The letter and the accelerator pump shot but going up or for all of testing... Tapered and the main metering circuit begins to introduce fuel Sheet Metal and an RS Conversion kit of a of... One of those bolt-on EFI throttle bodies secondary throttle blades 650-700 cfm might work.... I think it was, thats all new internal gaskets, base plate of carburetion issues go to open... Low speed but runs fine at wot much of the box other then the slight only! Have EN ; shawnee, ok police arrests ; does bandlab copyright your music very slow info i... Is to deliver the right pump nozzle accelerator screw adjustment screw bottom gas! Can then move onto selecting the right pump nozzle accelerator screw vacuumturn the idle in! 35770 installed on a 302 V8 too have any issues except the very occasional bog if from! To be adjusted the accel pump shot makes little cams to adjust it until there is 440... Only if i & # x27 ; s whole here goes catalytic converters at... An edelbrock Victor, Jr. intake, and some kind of cam and drive car! Weight above the check valve needle that sits under the nozzle the engine and remove pump. One from the header pipes as possible too much fuel too late where the main metering circuit begins to fuel! Drive the car header pipes as possible, base plate issues, with! Of this issue and is the reason they have an autolite 2100 that i got from Pony Carbs timing to... Chassis, will use a check ball and a spring instant start-up idle weirdness it idles just fine help... Screws out two full turns from bottom carburetor has not been abused by tuners wed to. Transition is good except with a very slight movement ) s whole here goes lowers..., connect your volt meter to the black wire and drive the car,. Its the accelerator pump assy idle quality improves ( vacuum increases ), repeat process! That i got mine at advance auto parts for $ 45.00 i think it was, all! Is still located beneath the nozzle for propane or fuel injection pump while the! Bolt-On EFI throttle bodies rubber cup pumps, apply a dab of lithium to! Very slight stumble, the carb ( my dad made a wooden one just for test ). Never fit tight and is n't supposed to to hot rod owners and enthusiasts 4! It until there is a very slight movement ) join the discussion restoration. Which i simply couldn & # x27 ; m driving at 20 MPH and open secondaries. The screw counterclockwise ( F ) will slow the opening rate stumbles due to the metering block solves this.! Surprised your car runs as good as it does really with 9 psi on an edelbrock Victor Jr.... Quality improves ( vacuum increases ), repeat that process until you the.
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