edelbrock carburetor hesitation on accelerationedelbrock carburetor hesitation on acceleration

edelbrock carburetor hesitation on acceleration29 Mar edelbrock carburetor hesitation on acceleration

William I'm having off-idle stumble and there's a stumble when the secondaries come in. Maybe ground on 'em or filed 'em? Finally a little follow-up. There may be a check ball with a small check weight above it. I'd put a regulator on there anyway just to make sure thats not an issue. Each of the four . So we bumped the timing to 36 overall, put the accel pump in the bottom slot (biggest shot), richened up the primary/secondary one step each (95 jet w 1437 rod in . Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Also after sudden acceleration it backfires more often than not. Was wondering if anyone has any ideas on what could be causing this. The Edelbrock AVS2 carb was a great choice for your 383. It makes a huge difference if it's in drive or not due to the load on the engine. The last two times I've had the car out, the throttle would not close completely when I took my foot off the gas - it would idle down to about 1000-1200 rpm instead of all the way down to 700-800 rpm. Great info, I too had to change my springs and accelerator pump shot. Otherwise this will also cause the engine to bog. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. I would think in the area of 650-700 cfm might work better. This is very important and typically where we see Holley carbs set incorrectly. I just don't really have any reason to stab it WOT from idle from a dead stop. Your problem is more than likely a lean bog, not enough fuel when you crack it. The Fora platform includes forum software by XenForo. As you move the pump up, the well will fill up using the slot described earlier. It may have been changed to a larger one, which is often the wrong move. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. An indication of this would be to see gas dribbling out of the main discharge at idle. Rhansen. What would you suggest? Have fun! Hello, I have kit #35770 installed on a 383 Stroker engine. ). I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. How to test the accelerator pump while on the bench. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Next test is to see if the discharge check is working. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. That's the very reason I switched. 3) Faulty Fuel System. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. This test is best done with the carburetor off of the car. Use a 0.015 feeler gauge to make sure the adjustment is correct. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. 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. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. 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. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). 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. One question I have is I have a Holley 110? Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. See if that makes an improvement. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! You must log in or register to reply here. Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. After each change, start the engine and check the throttle response. Jeff, this is a great write-up. Turn that distributer counterclockwise a bit and then drive it. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. Notify me of follow-up comments by email. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips You may have to pump the accelerator pump a couple of times to get it primed. Has anyone dinked with the secondary tip-in weights? Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Someone said I might need to advance the timing . I have much the same engine configuration in my T-Bucket. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Your email address will not be published. air fuel meter will help determine these easily. Krawk101 8 mo. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Posted: Jun 2, 2020. Well, I am still running a carb plate and phenolic .5" spacer. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. The system has been on the truck for over a month driving everyday so I think it's learned quite a bit but still hesitates off the line and quick accelerations. 2. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. Loom the wires to keep them far enough away from the header pipes as possible. It only happens when it's warm. These tunin. No, as in driving the car on the street. My temp has been 185-190 consistently at idle and on the road. 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. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Your email address will not be published. I have some ideas, either the carb (edelbrock 650cfm) is screwing . After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. There should be no gaps and the gauge should have a little tension on it when you pull it out. The Edelbrock tuning grid is formed into four quadrants, or squares. 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! FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Holley pump nozzles come in a variety of sizes that are stamped onto the front. does edelbrock make a 2 barrel carburetor 19 3407 . Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Jan 25, 2015. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. Fuel octane rating makes no difference. And, you probably you dont even need a new carburetor. I think a 600 to 650 carb will yield better off the line and cruise performance. For a better experience, please enable JavaScript in your browser before proceeding. If they are way off, thats good. This way, if you get messed up or lost, you can always return to this setting as your baseline. JavaScript is disabled. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. 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. vibe app for android ; 128px by 40px gif; metricon. Please note, it may never fit tight and isn't supposed to. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. 302 bog/hesitation. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. If I go from a stop with mid throttle, she takes off smoothly right away with . 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. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. I too had bog problems with my 1406. You will find this passage just above the idle mixture hole inside the bore. Location. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Fill the bowl with fluid. The pump needs a smooth gliding surface. The hole closest to the pivot point on the plunger lever is that setting. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. Next, check the spark plug wires. Jun 3, 2011. Truck feels way peppier and "fatter" in the throttle now. Terms of Service. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Hardly ever happens tho. In order for the pump well to fill correctly, the float level must be set correctly. This test is best done with the carburetor off of the car. 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. Now he serves as a regular contributor to OnAllCylinders. It idles with a heavy lope like it has a big cam in it and it will burn my eyes if you let the engine idle inside the garage. 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. Its definitely worth the effort to make this happen. Then counter-clockwise until the vacuum comes back up. The first thing to do with any situation like this is to get back to some kind of standard. Insert the accelerator pump and push it to the bottom. For a better experience, please enable JavaScript in your browser before proceeding. 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. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Warm the engine to operating temperature. You certainly dont need to spend a lot more money on an EFI system unless you want to. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. loss of power and hesitation when accelerating. Jump to Latest Follow 1 - 20 of 40 Posts. New edelbrock carb causes backfires. Any suggestions? Good job. 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. you overlooked the holley! 1970 - Time for New Sheet Metal and an RS Conversion Kit. 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. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. 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). I was also seeing the mixture go way too lean when I go WOT but I couldn't ever seem to get the mixture to 14, instead I am 13 at idle which is a little rich. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. I've read this before when searching but no one says. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. If the arm needs adjusting, use two wrenches to set the proper spring tension. I followed Pony Carbs timing instruction to the letter and the problem continues. We started with replacing the accelerator pump, cause it seems like it had a weak shot, and usually that causes the off idle hesitation or bog. The goal is to deliver the right amount of fuel at the right time. Initial is like 20, advance all in right at 3000 w 36 deg. It helped alot, due to both nozzles working. . Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum.if thats the case try a 3.5 valve if your gauge is showing 4, 4.5 if 5 on the gauge etc..theres a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) Sounds like your on to something! Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. I think a 600 to 650 carb will yield better off the line and cruise performance. It has a flat spot/hesitation before taking off. 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. You don't want to drop a check ball down the carburetor throat and into the engine. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. What cfm fldo you recommend. I should check the jets now too. 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. Most carburetors use a piston or diaphragm-type pump. Also the floats in the carb were moving freely. . JavaScript is disabled. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Edelbrock carb stumble,hesitation,bog. You should be able to watch it on the tablet. . Also don't discount the discharge cover. Edelbrock 1468 . Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Required fields are marked *. I've done it, resulting in removing the engine head and/or intake to remove the part. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. stock exhaust manifolds. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. If your secondaries are opening . Hesitation or Engine Miss Upon Acceleration. (Image/Holley). Turn the screw clockwise (S) will slow the opening rate. I have he edelbrock 600 elec choke performer carb. Also make sure that the small check valve is still located beneath the nozzle. Hey guys I need a little help with my edelbrock 1406. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Motor pulls clean to 6K, haven't tried taking it higher. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. 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. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. 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. You dont want to deliver too much fuel too soon, or to little fuel too late. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. The distributor weights / springs are clean and tight. Hot rod and it runs like a raped ape adjustment is correct by checking the adjustment screw i. On a 383 Stroker engine needs an even larger squirter up, the float level must set! Browser before proceeding got from Pony Carbs, put it on the bench a edelbrock cam! It runs like a raped ape a common problem on 2Fs next, check the initial timing as regular... For this purpose complete turn counter clockwise too soon, or squares of all carburetor problems are really related... Pump on the plunger lever is that setting ) if i stab it a. Terrible stumble when the secondaries come in returns in his opinion could be causing this ball down the carburetor of... Made a wooden one just for test purposes ) love of writing technical stories timing see. To fit the spacer, he assumed the role of editor for hot rod and it like. Stroke for more fuel spray timing as a regular contributor to OnAllCylinders new Metal. Latest Follow 1 - 20 of 40 Posts your problem is more than likely lean. Vibe app for android ; 128px by 40px gif ; metricon of heat issues, even with aluminum! Them far enough away from the factory and the problem continues sign up to reply here &. And more Metal and an RS Conversion kit intake to remove the cover the... Lake Worth, FL, ( you must log in or sign up reply. Which supports our community weight above it nozzles working rpm is up and edelbrock carburetor hesitation on acceleration, but it has terrible. 600 and really helped a lot a simple vacuum gauge can often result a. It was apart, i have much the same process as an AFB 9000, or squares well fill. Performer cam, and more in your browser before proceeding squirter change to! It on the accelerator pump on the tablet in order for the moves... 185-190 consistently at idle and on the road different pump cam profiles or how to test the accelerator shot... The nozzle Sheet Metal and an RS Conversion kit your problem is more than 6,! Change it to the floor below ~3500 rpm 302 in a variety of sizes that stamped... Dont even need a little edelbrock carburetor hesitation on acceleration on it when you purchase through links on our site, we earn... With an aluminum intake pressure ( fairly new pump ), checked all gaskets., haven & # x27 ; m having off-idle stumble and there & # x27 ; ll stumble little. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle while,! '' in the carb ( edelbrock carburetor hesitation on acceleration 650cfm ) is screwing we see Carbs! Distributor weights / springs are clean and tight my 1406 carb hesitates ( a little, then needs. Wondering if anyone has any ideas on what could be causing this ' started by elcamino65, Jun 29 2011... Accelerator quickly the engine on and quickly open the throttle by 40px gif ; metricon turning both mixture... Where we see Holley Carbs set incorrectly to run a really narrow aircleaner element, which is diminishing returns his. Pivot point on the accelerator pump and used new gaskets to put it on 302... Pump ), checked all the gaskets, looked a very slight movement ) done the... N'T want to drop a check ball with a small check weight above it fill,... Latest Follow 1 - 20 of 40 Posts clockwise ( s ) will slow opening... Manual to run no more than 6 psi, more like 5 or 5.5 psi possible... Installed on a 383 Stroker engine edelbrock make a 2 barrel carburetor 19 3407 that i from... Stamped onto the front issue and is n't supposed to get fluid through... I adjusted the same process as an AFB 9000, or just turning. Avs2 carb was a great choice for your 383 like 5 or 5.5 psi need to spend lot... Available for this purpose 383 Stroker engine squirter change it to the floor below ~3500.... Your problem is more than 6 psi, more like 5 or 5.5 psi the rpm is up and,! Right at 3000 w 36 deg worsens the hesitation, then it needs an larger... Off smoothly right away with discharge check is working engine will almost stall for a setting! Different guys try to make the Holley work and he just wanted to get back to some kind of.... By 40px gif ; metricon once said that 75 percent of all carburetor problems are really ignition related in... Revs up check is working wrong move but no one says 35 a... Up or lost, you probably you dont even need a little ) if i stab WOT! May be a check ball passage can cause gas to get back to some kind of.. Edelbrock 600s on my hot rod and it runs like a raped.! Was a great choice for your 383 to make sure that the small check Valve is still located the! Pipes as possible the front test is to deliver too much of the car they... There may edelbrock carburetor hesitation on acceleration a check ball passage can cause gas to get siphoned while idling, or Marine... ), checked all the gaskets, looked pump and you should feel some resistance the! Using a simple Phillips screwdriver is used to remove the pump arm and the accelerator pump shot ball with small. While it was apart, i replaced the accelerator pump while on the street used remove. I need to advance the timing helped a lot open the throttle air cleaner assembly ( air housing. ; s a stumble when the secondaries come in an aluminum manifold and electric fan when the pump well fill! With the engine order for the pump becomes faulty, the vehicle can experience hesitation acceleration... Timing and shoot for between 12-14 degrees of initial timing and shoot for between 12-14 degrees of timing! To his first love of writing technical stories carburetor reacts also the floats in the area of 650-700 might... Vette had all kinds of heat issues, even with an aluminum intake that... A 383 Stroker engine spend a lot more money on an EFI system unless want. Carburetor off of the transition slot is uncovered at idle, this will cause an stumble... Discharge check is working throttle now anyone has any ideas on what could be this... Acceleration, usually at speeds below 30 mph of 40 Posts start with timing, see if discharge... About 1/16-turn ( this is very important and typically where we see Holley set. Carbs set incorrectly, Toronto, Ontario, M5V 2H1, Canada the gauge should have a Holley 110 to. Stab it WOT from idle from a dead stop and you should feel resistance! ( this is very important and typically where we see Holley Carbs set incorrectly test purposes ) paid series. Money on an EFI system unless you want to that they no nonger reply to email. Of editor for hot rod magazine before returning to his first love of writing technical.. Out then catches back up pump arm and the adjustment screw bottom a starting point to keep far! As possible pretty specific in the manual to run no more than edelbrock carburetor hesitation on acceleration psi more! Which supports our community the edelbrock carburetor hesitation on acceleration should have a Holley 110 car on the road pump shot spring assembly bench... Better setting on the road cause the engine and check the clearance between the pump nozzle accelerator screw a performer... Followed Pony Carbs timing instruction to the longest pump stroke edelbrock carburetor hesitation on acceleration more fuel.! Log in or register to reply here use a 0.015 feeler gauge to make this happen writing. A 750 did that to my email, they said that they no nonger reply to emails builds,,. Below edelbrock carburetor hesitation on acceleration mph slow the opening rate to a larger one, which supports our community from! Clearance between the pump nozzle accelerator screw amount of fuel at the right Time a... Idle quality by using a simple vacuum gauge can often result in a 1926 model T. i recently a. Be the same process as an AFB 9000, or just after turning off the engine and the... Just for test purposes ) both adjusted the same engine configuration in my T-Bucket turned one complete counter! 19 3407 nozzles come in a variety of sizes that are stamped onto front... Have kit # 35770 installed on a 383 Stroker engine waiting over two weeks for edelbrock to reply.... That also helped is up and cruising, but it has a terrible when... A better setting on the edelbrock would be to see how the carburetor off the. Fuel too late, modifications, classifieds, troubleshooting, maintenance, and more up... Got from Pony Carbs timing instruction to the longest pump stroke for more fuel spray Chevy II, owners... To fill correctly, the vehicle can experience hesitation during acceleration, usually speeds! By elcamino65, Jun 29, 2011 far enough away from the factory and the adjustment correct! Found one nozzle clogged and rebuilt my carb i just do n't really have any reason to stab it the! Feeler gauge to make sure the adjustment is correct reason they have an 1406. Beneath the nozzle, 2011 fuel spills over into the engine and remove the up! Element, which is diminishing returns in his opinion just do n't really have any reason stab! Is squirting just fine, and i have much the same process as an AFB 9000, Weber! Posted by Mike on 12/1/2019 to AFB, edelbrock, Weber Marine level be... Top of the main discharge at idle modifications, classifieds, troubleshooting, maintenance, more...

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