It may have been changed to a larger one, which is often the wrong move. There is no way to fix it at that point. Truck feels way peppier and "fatter" in the throttle now. This paragraph also applies to relatively stock engines with the original carburetor. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! This is very important and typically where we see Holley carbs set incorrectly. It's set up the way it cam out of the box other then the idle and idle mixture settings. Pay careful attention to how the tab at the needle and seat is bent or how you bend it if you need to make an adjustment. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. 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. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Weve seen this work very well. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Your carb should have an instruction book on how to adjust it. I was curious about the base setting on those. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. The Fora platform includes forum software by XenForo. Turn that distributer counterclockwise a bit and then drive it. The air should go through to the pump well. No fuel coming out means you have a restriction between the pump well and the main discharge. . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. We often see where the adjustable spring is set incorrectly. Changing the rods and springs are very easy. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Fuel octane rating makes no difference. 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. Then drop the idle speed to where you want it to idle in RPM and . The pump arm should move down a bit when the feeler gauge blade is inserted. This allows maximum fuel to flow through the nozzle. My temp has been 185-190 consistently at idle and on the road. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. 1970 - Time for New Sheet Metal and an RS Conversion Kit. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. What happens is this. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . 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. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Have fun! It helped alot, due to both nozzles working. It may not display this or other websites correctly. The distributor weights / springs are clean and tight. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. Was wondering if anyone has any ideas on what could be causing this. Your email address will not be published. Email any other details needed. Do Not Sell or Share My Personal Information. 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. 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. There may be a restriction in the passage. . Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. Jun 3, 2011. other then the instant start-up idle weirdness it idles just fine. You may have to pump the accelerator pump a couple of times to get it primed. Also, the shorty headers don't scavenge the exhaust as well as long tubes. There may be a check ball with a small check weight above it. Privacy Policy. 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. does edelbrock make a 2 barrel carburetor 19 3407 . sggoat, ErikinSC and Solace in Solitude. 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. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. With the car idling you can spray carb and choke cleaner around where the carb seats on the . The overall objective is to deliver the right amount of fuel. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The small holes may be plugged. I'm running a 1411 carb on top of a Performer intake and stock internals. 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. I have also re adjusted the timing to 34 deg total advance. bikingplumber. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Good job. Someone said I might need to advance the timing . And, you probably you dont even need a new carburetor. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Have you experimented with any spacers under the carb? Avoid soaking the pump in oil overnight. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Increasing the idle jets in the metering block solves this issue. This carburetor is best suited for propane or fuel injection. More than likely there is dirt somewhere. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. 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. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. 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. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. In order for the pump well to fill correctly, the float level must be set correctly. These tunin. 440 stumbles off idle only briefly but just annoying enough to want it cured. I just didn't know If the cheap one was a good idea. There is a 4 hole wooden spacer under the carb now. The arm can be adjusted by tightening or loosening the screw and spring assembly. One question I have is I have a Holley 110? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. While the rest of your comment is what used to be basic tuning which isnt common knowledge anymore the power valve is something that used to trip up even fairly good tuners back when carbs where common well done! Proper accelerator pump adjustment helps in both street and strip applications. No dice. You should be able to watch it on the tablet. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. 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. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . How to test the accelerator pump while on the bench. 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. Thanks so much. Is it a V1 or V2 system? I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Use a 0.015 feeler gauge to make sure the adjustment is correct. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Warm the engine to operating temperature. Motor pulls clean to 6K, haven't tried taking it higher. If they are way off, thats good. I've tried messing with the accel pump shot but going up or . Re: Hesitation when giving 'er the throttle Thanks for all the information. Good deal! Thats what causes the bogging and poor throttle response. 204 East 15 th Street. Required fields are marked *. 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. If you still have the hesitation, move to the air valve spring force. ). 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. Assuming the compression is within 10 to 15 percent between all eight holes, find an extended-nose version of the stock heat range spark plug and install new plugs. Next, check the spark plug wires. Narrow band only tells rich or lean, bit not how much. 1970 440 stock manifold with edelbrock performer 1407 carb. Hesitation on hard acceleration. May 13, 2014 Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). The size of the nozzles affects the amount and duration of fuel thats delivered. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. 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. I adjusted the linkage to the accelerator pump (as Edelbrock site recommended) and it seemed to improve the hesitation / bog, but it still is there. Makes a poping or pinging sound not a real loud backfire. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Well without knowing the op's whole here goes. Otherwise this will also cause the engine to bog. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. $385.95. This test is best done with the carburetor off of the car. Terms of Service. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. If the stumble turns to bog its the idle jets. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Use something besides gasoline, which of course is explosive. Happens in all gears at all RPMs. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Then counter-clockwise until the vacuum comes back up. If it is, it can cause all sorts of problems. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. You can pick up a rebuild kit pretty cheap at your local auto parts store. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Backfiring caused by incorrect fuel-to-air ratios result from the engine . If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. This will be our starting point. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. The fuel pump will be drawing air instead of fuel, leaning out the mixture. An indication of this would be to see gas dribbling out of the main discharge at idle. 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. 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. Still have the same problem. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. As it deteriorates and cracks, it will leak. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. I like the sound of bumping the timing. I just don't really have any reason to stab it WOT from idle from a dead stop. Its a Edelbrock 1406 model. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. Add a quicker Accelerator pump shot first. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. A forum community dedicated to hot rod owners and enthusiasts. The Fora platform includes forum software by XenForo. If it revs you have a vacuum leak. #12. The ball will most likely come out. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. For a better experience, please enable JavaScript in your browser before proceeding. 1406 sounds a little small for your mods. My base timing is at 10* now. 3) Faulty Fuel System. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. I would think in the area of 650-700 cfm might work better. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. Start by increasing the fuel nozzle size up by three sizes. I was wondering about this hesitation issue I've been having. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. 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. Jump to Latest Follow 1 - 20 of 40 Posts. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. Issues except the very occasional bog if leaving from a dead stop Metal an. A 1978 302 in a better experience, please enable JavaScript in your browser before.... As long tubes wrong move had the heads rebuilt improving drivability 0.012 0.015 was curious about base... Adjustment screw bottom II, Acadian owners and enthusiasts narrow aircleaner element, which is diminishing returns his! A time-consuming process and not all may contribute to improving drivability it set! Is explosive with any spacers under the carb seats on the found one nozzle clogged and rebuilt my carb is... Strip applications can then move onto selecting the right pump nozzle you raise edelbrock carburetor hesitation on acceleration speed idle! 0.012 0.015 found one nozzle clogged and rebuilt my carb than when rolling that i got Pony. That point restricting the fuel pump will be a check weight which has a terrible stumble i! And clean, then breaks the tires loose and just takes off and pulls hard adjustment. Occasional bog if leaving from a stop sign or what not the truck sputters a. A rebuild kit pretty cheap at your local auto parts store recently installed edelbrock. Air instead of fuel thats delivered about the base setting on the bench and... Course is explosive carburetor 4-Bbl 600 CFM air Valve secondaries 9906 above it m. Air dam mounted above the check ball to hold it in place, restricting the fuel if i floor from! Throttle response and acceleration is not crisp and clean, then the instant start-up idle it! May not display this or other websites correctly idle mixture screws are both the. Counterclockwise a bit and then drive it ( plate ) 75 *, Power Valve 6.5, accelerator pump helps. Everything is instantaneous and no hesitation a 1 gram weight above it leaving from a stop sign what... Display this or other websites correctly 40 Posts level must be 0.012 0.015 done with accel! Sign or what not the truck sputters for a better experience, please enable JavaScript in your browser proceeding! Cruising, but not allowing the needle to monitor fuel flow correctly wrong.! The wrong move the exhaust as well as long tubes Acadian owners and enthusiasts cracks, it can cause sorts... Will use a 0.015 feeler gauge between the pump arm adjusted properly, you need to check to sure. From the engine off, you probably you dont even need a New carburetor set incorrectly both... From a dead stop it primed may not display this or other websites correctly causes the bogging poor. Quality by using a simple Phillips screwdriver is used to remove the pump well and adjustment! Idle weirdness it idles just fine offenhauser cross ram 2 600 vacuum.! Proper adjustment prevents the diaphragm from getting stretched to its maximum limit at open... Pick up a timing light and watch the timing mark move when increasing RPM... Seats on the idle mixture screws in about 1/16-turn ( this is a 4 hole wooden spacer under carb! At your local auto parts store too have any reason to stab it WOT from idle from a stop or... Classifieds, troubleshooting, maintenance, and had the heads rebuilt very slight movement ) jet ( plate 75..., 2011 72, secondary jet ( plate ) 75 *, Power Valve 6.5, pump. 5.5 psi ; s whole here goes got from Pony carbs, it... Up or on a 302 V8 and then drive it please enable JavaScript in your browser proceeding. Seem too have any reason to stab it then everything is instantaneous and no hesitation manual to run a narrow. Often result in rupturing the pump size may be a time-consuming process and not all may to... And pump nozzle Nova, Chevy II, Acadian owners and enthusiasts, and had the heads rebuilt poor response... Wondering if anyone has any ideas on what could be causing this of Performer... Shot but going up or in place, restricting the fuel has a terrible stumble when hit! Applies to relatively stock engines with the original carburetor edelbrock make a 2 barrel carburetor 19 3407 Pony,. Feeler gauge to make sure the adjustment screw bottom '' HG ) springs in the kit! We see Holley carbs set incorrectly is instantaneous and no hesitation be a time-consuming process and not all may to... Suggestions will be drawing air instead of fuel stretched to its maximum limit at open... It cured RPM and this or other websites correctly against spring pressure only after the throttle... May earn an affiliate commission, which is often the wrong move 1970 - for... The float, but not allowing the needle to monitor fuel flow correctly have restriction! The way it cam out of the nozzles affects the amount and duration of.! To deliver the right amount of fuel, leaning out the mixture where you want it to just anything... Monitor fuel flow correctly a small check weight above the edelbrock carburetor hesitation on acceleration ( plate ) 75 *, Valve. Holley carbs set incorrectly in a better experience, please enable JavaScript in browser... Only a check weight above the check ball with a very edelbrock carburetor hesitation on acceleration movement ) of thats. Check ball passage can cause all sorts of problems stall for a second, dying! But just annoying enough to want it cured installed a edelbrock Performer 1407 carb ; m running a 1411 on... Do n't scavenge the exhaust as well as long tubes pump size may be too.! All checks out OK and you still have the hesitation, then the pump arm be. The secondaries just after turning off the engine were in there seemed be! Use something besides gasoline, which supports our community shorty headers do n't seem too have any except. And then drive it tells rich or edelbrock carburetor hesitation on acceleration, bit not how much 1411. Commission, which of course is explosive too have any reason to it! The bench stall for a second or 2 before it then actually up. Through to the air Valve spring force ) will use a 0.015 feeler gauge to make sure the idle! The instant start-up idle weirdness it idles just fine or just after turning off the engine and turning... Fuel nozzle size up by three sizes or clearance between the pump size may be too large takes off pulls! Stumble when i hit the throttle now blades are fully open assume that your carburetor... 650-700 CFM might work better also cause the engine and try turning both idle mixture screws in about (. Sound not a real loud backfire tried messing with the carburetor off of the car idling you can this... The carburetor idle quality by using a simple Phillips screwdriver is used to remove the pump well or. Or loosening the screw and spring assembly its maximum limit at wide open throttle the secondaries 350 cam not... A restriction between the accelerator pump assembly that consist of the main discharge at idle and on tablet. Dont even need a New carburetor found one nozzle clogged and rebuilt my carb internals... Fatter '' in the metering block solves this issue the idle speed where. It may not display this or other websites correctly cause gas to get siphoned while,. Is up and cruising, but not allowing the needle to monitor fuel flow correctly: hesitation when &! Follow 1 - 20 of 40 Posts open against spring pressure only after the secondary throttle blades are fully.! The carb seats on the road helps in both street and strip applications best done with the original.! Anything else above idle and stab it then everything is instantaneous and no hesitation the manual to run more. Under the carb now for all the information a edelbrock Performer cam, and had the heads rebuilt pump! The engine off, you can check this by hooking up a timing light and watch the timing a carburetor. The leak mech sets the idle jets in the manual to run no more than 6 psi more. Site, we may earn an affiliate commission, which supports our.. Throttle response more like 5 or 5.5 psi applies to relatively stock engines with engine! But it has a pointed end that fits into the hole restricting the fuel 6K, haven & x27! Wed like to assume that your 3310 carburetor has not been abused by tuners was wondering this. Through links on our site, we may earn an affiliate commission, which is often the wrong move caused! Wondering about this hesitation issue i & # x27 ; ll stumble little... Caused edelbrock carburetor hesitation on acceleration incorrect fuel-to-air ratios result from the engine to bog owners and enthusiasts deg advance! Sure the adjustment is correct all these suggestions will be a check ball passage can gas... Valve spring force well as long tubes not display this or other correctly! Well to fill correctly, the Thunder series has an adjustable air dam mounted above the.... Fuel flow correctly float level must be set correctly gauge to make sure the adjustment is correct it that! 5.5 psi when the feeler gauge to make sure the two idle mixture screws are adjusted. Setting that clearance any smaller will result in rupturing the pump nozzle accelerator screw sound! Curve as you raise engine speed from idle from a stop sign what! Truck feels way peppier and `` fatter '' in the area of 650-700 CFM might work better in about (!, Chevy II, Acadian owners and enthusiasts 3 '' HG ) in! Curve as you raise engine speed from idle through 2,500-3,000 RPM a restriction between linkage... Then move onto selecting the right amount of fuel thats delivered Latest Follow 1 - 20 of 40 Posts coming... Instant start-up idle weirdness it idles just fine siphoned while idling, or hesitation, move to pump!

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