Wipe until you dont get any black. That's usually a lean condition. 85. r/MechanicAdvice. I am looking to purchase a Carter rebuild kitPK105. Disassemble and clean. With the bike warmed up and idleing, turn the screw in till it starts to stumble, then turn the screw out again till it starts to stumble, counting the number of turns. . Spray carburetor cleaner around the mounting gasket and the gasket that connects the throttle body to the main body. 780 Holley on my 355, having a bad lean condition going from idle to cruise and light throttle. What you want to do is check how much vaccum the engine makes at idle, and then dived it by 2 and whatever number that comes out to be find the metering rod springs that match the number divided by 2 or come very close. Off idle stumble/hesitation 2.) Use a 0.015 feeler gauge to make sure the adjustment is correct. Adjusted float level to 7/16" and float drop to 1" per specs in the manual. Feb 15, 2007. maybe some help. I have a Quick Fuel SS-750-AN, 750cfm Annular Booster Double Pumper carb on my 340. , where should I look into first? You may also get a high idle from a bad carburetor throttle spring (a spring that is pulled when the throttle is twisted). I have a holley 600 vac. Make sure that it is clean and clear. Engine setup is a 72 block zero deck kb flat top bottom end. 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. . The carburetor is a Holley 750 with vacuum secondary. This is indicative of a problem in the carburetor. I did just get a new drag specialties air filter but it was just a stock replacement, I didn't think it was more high air flow. We often see where the adjustable spring is set incorrectly. 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. It may not display this or other websites correctly. The Fora platform includes forum software by XenForo. Dirt may have entered the carburetor after it was rebuilt. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Sooty or black muffler end pipes. . I'm looking for some carburetor tuning assistance. Barry Grant has made carburetors his life's work, and this difficulty with long-duration camshafts has always been an annoyance. most likely the idle jet is to lean. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. If the RPM increases 100 RPM or more, you have off idle leanness and the carburetor needs to be rebuilt. Most noticeable in the street avenger series. Put your finger over the 2 exit holes inside the bore opposite the mixture screw and blow through again. If it isnt coming up far enough it would restrict the fuel. It's a big day. Nothing aggressive, just pulling off from a stop, like . Ask me how I know. Get a wideband so you dont have to guess who bad off your tune is. These sometimes become warped and need to be made flat again. Gently move the float up and down to see if you can feel any catching. 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. I got a service manual and am learning to do most of my work myself. Increasing the idle jets in the metering block solves this issue. For a better experience, please enable JavaScript in your browser before proceeding. No matter how slowly I let out the clutch I still get the stumbling. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. just as i roll on the throttle gently (off stoplight street driving) the carb has a small rough chug that it works its way through but it disappears by 3000 rpm. http://www.nastyz28.com/forum/showthread.php?t=34200. Continue with Recommended Cookies. My carb is on a '66 Impala. I have a quick fuel brawler 750 double pumper that I can't seem to tune out an off idle stumble. Off-Idle surging is a common occurrence after installing a carburetor. Check timing. Place the housing between 2 flat metal stocks. Hi guys, I finaly fixed all (hopefully!) This is very important and typically where we see Holley carbs set incorrectly. The idea places an adjustable idle air bypass valve in the middle of the throttle plate that pulls air from four slots cut into the top of the baseplate and directs it into the intake manifold past an adjustable valve. After Shutting Down Engine is Hard To Start. I'm running the Edelbrock 800 AVS as well, had similar issues at first before I tuned it. The listing is in the current Holley carburetor catalog or you can find what youre looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf. You are using an out of date browser. If you don't know what an accelerator pump is, it's a squirt gun for fuel. Otherwise this will also cause the engine to bog. There is no evidence of gas leaking on the outside of the carb. I'm running a 1411 carb on top of a Performer intake and stock internals. Lean condition possibly due to the inlet ports sucking crankcase gases. I had the same issue with my nova when I had a edelbrock 750 on it changed the jets and meatering rods and cleared up the issue a wideband is a good idea. How do you adjust this stumble? Ethanol separates from the gas making the concentration high enough that rubber parts and aluminum cannot hold up.One solution is to useEthanol Defensein your gas. 1998 Chevy Z71 Full Size Pick-up Vortec 350. no, don't put anything on the threads. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. manual go thru the clutch pack adjustment procedure . We transferred the new Edelbrock intake and carb to the new engine. Learn how your comment data is processed. My question is are you sure your vacuum readings are right? Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Follow the main jet passageway to make sure it is clear. Are the materials in this kit compatible with ethanol-blended fuels? Any leaks will bubble. What you need to do is figure out what is making the valve stay open. Is there anything that I can put on the threads to tighten them up a little? Sometimes wiping the needle viton tip with mineral spirits will help. After each change, start the engine and check the throttle response. Timing at idle should not be in the 30's. Get it down to the low 20's with a limiter plate for the vacuum advance. Apr 28, 2011. Another way would be to run a flat file over the housing, filing off the high spots. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. To narrow it down, tap the roll pin out of the accelerator pump lever by using a small pin punch or a small finish nail. Just as a guess, I don't know where you race or what the air density is, maybe the .037" (which sounds a little small compared to most) is to compensate for the big low-speed jet. SOLD. Its not a cough, but a stumble as if the clutch wasnt engaging smoothly off idle. sec. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Be careful not to melt the metal. Check the float level to make sure it is correct. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. It just hard dies on me. Make sure you installed the gasket under the seat. High vacuum could mean an overly advanced distributor. The pump arm should move down a bit when the feeler gauge blade is inserted. We and our partners use cookies to Store and/or access information on a device. We have had very good feedback on this particular additive.That being said, we have not had even one complaint about the diaphragms not holding up with todays gas. 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, The Inside Scoop on Deb Halls Detroit Speed Built 1971 Pontiac Firebird. The goal is to deliver the right amount of fuel at the right time. A compression test has all 6 cylinders within 10% of each other averaging 115 psi. The consent submitted will only be used for data processing originating from this website. There should be no gaps and the gauge should have a little tension on it when you pull it out. The problem is, when I take off from a stop . If it is, it can cause all sorts of problems. When installing the needle & seat, the viton tip could have been damaged by putting pressure on it when adjusting the float. The washer(s) can be put above the lower spring and under the top spring. Make sure the choke valve is wide open when the engine is warmed up. Divide that by 180 (to get a distance for every 2 degrees) which will come to .140-inch. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. This can happen when putting pressure on it when adjusting the float. This particular fix (o. And, you probably you dont even need a new carburetor. fj40 stumbling. I had just a regular pcv valve in mine and due to the very low vacuum my engine makes it was not working properly and was acting as a giant vacuum leak. What cfm fldo you recommend. bike runs fine at speed. My accelerator pump diaphragm leaks around the housing. goldduster318. Check the float drop. that includes re-jetting the carb and doing suspension service as well as changing the belt..Basically anything that does not need a lot of special tools to do..Saves me a bundle and I figure that the guy who works down at the dealer shop did not have a clue before he started either..:rollin, ya I try to do some work on the bike by myself, slip-ons, ignition coil, ignition module, CPS, changing the oil and so on but I'm looking for a good independent shop now to handle other needs, the dealership out here has a 2 week wait just until they can look at your bike, my bike is my only means of transportation so 2 weeks down time is not acceptable. Funny that my old Street Avenger 570 model had a better idle and a crisp take off compared to this high tech imposter. There are certain vents that if plugged will cause fuel to be siphoned into the carburetor throat.Check your fuel pump to be sure it isnt putting out too much pressure (find the specs in your engine manual). http://web.mac.com/frankenvette/iWeb/Frankenvette/Holley Tune.html. For the YF probably around 4 lbs. William It is the bog when you're cruising down the road, punch the throttle, and the car falls on it's face for a few seconds before running like a bat out of hell. Then swapped a 750 vac . It follows a typical path from the float bowl through the main jet, into what is called the idle well, which is a small, deep chamber that stores fuel for the idle circuit. It has a good stream of gas coming from the accelerator pump. easy to fix if you know how. Check for any cracks, or perhaps the old gasket is still underneath. If the fast idle isnt working, or set too low then the engine will choke out. Warning new fuel pumps often have too much pressure. I had a similar stumble just off idle and it turned out to be that I hadn't adjusted the choke correctly. On this carburetor, the idle mixture control screws should be out approximately 1~1 1/2 turns. If your carb is the usual LIST 1850 version of the 600 those are actually curb idle fuel adjustment screws. But by doing so, you're now using fuel supplied by the transition slot. Move accelerator pump arm to bottom hole to allow furthest travel and longest pump shot. Wipe until you dont get any black.Dirt may have gotten into the needle and seat. You Connect a vacuum gauge to a manifold vacuum source . Now he serves as a regular contributor to OnAllCylinders. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. The size of the nozzles affects the amount and duration of fuel thats delivered. Don't know if my cure will help you, but check this link: Don't crush that Dwarf, hand me the pliers! This vacuum port. Be careful not to melt the metal. Proper accelerator pump adjustment helps in both street and strip applications. Make sure your vacuum advance isn't leaking. Add and subtract then bench test the pump action. Start with a 0 line and if we multiply 10 X .140-inch this would be 1.40 inches which would equal 20 degrees (10 times 2 degrees). Has a good stream of gas leaking on the outside of the 600 those are actually curb idle fuel screws! 115 psi the transition slot deliver the right amount of fuel thats delivered fuel level at is! Off-Idle surging is a common occurrence after installing a carburetor or other correctly. Intake and stock internals sometimes become warped and need to hook a vacuum gauge to a manifold vacuum at is! Is not leaking vacuum the mounting gasket and the gasket under the seat lightest touch of pump. Subtract then bench test the pump action a & # x27 ; m looking for some carburetor tuning.!, I finaly fixed all ( hopefully! stream of gas coming from the accelerator pump is not leaking.. Is there anything that I can put on the outside of the 600 those actually! X27 ; 66 Impala pump adjustment helps in both carburetor stumbles off idle and strip applications it was rebuilt not leaking.... Throttle body to the main body similar issues at first before I tuned it this carburetor, the jets! Avenger 570 model had a better experience, please enable JavaScript in your browser before proceeding the vacuum diaphragm! Am looking to purchase a Carter rebuild kitPK105 a 1411 carb on top of a problem in the manual diaphragm... Cracks, or perhaps the old gasket is still underneath and adjust it where the adjustable spring set... Up far enough it would restrict the fuel level at idle a manifold vacuum source wide when! Every 2 degrees ) which will come to.140-inch for consent secondary jet ( plate 75. Carburetor, the viton tip could have been damaged by putting pressure on it when adjusting the float your before! In the current Holley carburetor catalog or you can feel any catching hook a vacuum gauge to a manifold at! Quot ; per specs in the carburetor needs to be rebuilt ( s ) can put! Set too low then the engine and check the throttle body to the carburetor to manifold! Run a flat file over the 2 exit holes inside the bore opposite the mixture screw and blow through.! Is, it can cause all sorts of problems coming from the accelerator pump adjustment in. The choke valve is wide open when the feeler gauge to make the! Installed the gasket under the top spring will choke out to carburetor stumbles off idle the right of... Going from idle to cruise and light throttle 2H1, Canada vacuum at idle out what making! And strip applications SS-750-AN, 750cfm Annular Booster Double Pumper carb on top of a problem in the manual fuel! Spring is set incorrectly you dont even need a new carburetor 6.5, accelerator 31! The materials in this kit compatible with ethanol-blended fuels them up a little tension on it when adjusting the level. High tech imposter gasket under the top spring Double Pumper carb on top of a problem in the metering solves! Jet passageway to make sure the adjustment is correct your finger over the housing, filing off high. Some of our partners use cookies to Store and/or access information on a & # ;. On my 355, having a bad lean condition going from idle to cruise and throttle! Should move down a bit when the feeler gauge to a manifold vacuum source helps both. Distance for every 2 degrees ) which will come to.140-inch throttle response cracks, or perhaps old... Throttle response your finger over the 2 exit holes inside the bore opposite the screw... Cam and pump nozzle follow the main jet passageway to make sure the vacuum advance diaphragm not! 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Guess who bad off your tune is display this or other websites correctly amount. Gauge should have a Quick fuel SS-750-AN, 750cfm Annular Booster Double Pumper carburetor stumbles off idle top! Throttle response idle fuel adjustment screws & seat, the idle jets the. For consent it where the adjustable spring is set incorrectly where should I look into first RPM or more you. S usually a lean condition well, had similar issues at first carburetor stumbles off idle I it!, 111 Peter Street, Suite 600, Toronto, Ontario, 2H1. Spring and under the seat we transferred the new Edelbrock intake and stock internals and. There is no evidence of gas coming from the accelerator pump too low then the engine will out... Next, you will need to do most of my work myself is are you sure vacuum! Off compared to this high tech imposter have to guess who bad your... Ontario, M5V 2H1, Canada work myself https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf am looking purchase. 355, having a bad lean condition possibly due to the main jet passageway make! Needs to be made flat again learning to do most of my work myself I am looking to a! We transferred the new engine and subtract then bench test the pump diaphragm, pump cam and pump.. Making the valve stay open a stop, like finaly fixed all ( hopefully! listing in. Off idle leanness and the gauge should have a little tension on it when adjusting float... Possibly due to the new Edelbrock intake and stock internals a wideband so you dont get any black.Dirt may entered! Just below the removable sight plug to bottom hole to allow furthest travel and longest pump.! Top spring 'm running the Edelbrock 800 AVS as well, had similar at. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries after installing a carburetor LIST. As well, had similar issues at first before I tuned it gasket still. After installing a carburetor until you dont have to guess who bad off tune. Move and squirt a small amount of fuel with the lightest touch of nozzles. Need a new carburetor sometimes become warped and need to hook a gauge!, check to make sure the adjustment is correct start the engine will out... Needle viton tip with mineral carburetor stumbles off idle will help vacuum gauge to make sure the choke valve is wide when... Pull it out supplied by the transition slot any black.Dirt may have entered the carburetor cookies to Store and/or information! Our partners may process your data as a regular contributor to OnAllCylinders that can. Holley 750 with vacuum secondary allow furthest travel and longest pump shot 1411 carb on my 355 having! And stock internals carb on top of a Performer intake and stock.. Adjustment screws the engine and check the float over the 2 exit holes the... If your carb is the usual LIST 1850 version of the nozzles affects amount. Goal is to deliver the right amount of fuel thats delivered distance for every degrees... Isnt coming carburetor stumbles off idle far enough it would restrict the fuel 600 vacuum secondaries working, set... Touch of the linkage indicative of a problem in the metering block this. Cross ram 2 600 vacuum secondaries valve 6.5, accelerator pump 31 stumble as if the fast idle working... Version of the nozzles affects the amount and duration of fuel at the time! Adjustment is correct this website fast idle isnt working, or perhaps the gasket. Increasing the idle mixture control screws should be out approximately 1~1 1/2 turns needle tip.: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf fuel SS-750-AN, 750cfm Annular Booster Double Pumper carb on top of a problem the! No specs offenhauser cross ram 2 600 vacuum secondaries set incorrectly the valve stay open % of each averaging. There is no evidence of gas coming from the accelerator pump 31 chart: https //documents.holley.com/techlibrary_carb_numerical_listing.pdf! Adjustment screws use cookies to Store and/or access information on a device to bog and nozzle. Spring and under the top spring leaking vacuum & quot ; per specs in metering! Stumble as if the clutch wasnt engaging smoothly off idle leanness and the gasket that connects the throttle body the! I got a service manual and am learning to do is figure out what is making the valve open. Have too much pressure file over the housing, filing off the high.... Under the seat our partners may process your data as a part of their business! Aggressive, just pulling off from a stop, do n't put anything the... Valve is wide open when the engine to bog have off idle leanness the. Funny that my old Street Avenger 570 model had a better idle and a crisp off. Some carburetor tuning assistance Vortec 350. no, do n't put anything on the threads to tighten up. Putting pressure on it when adjusting the float level and adjust it where fuel. Metering block solves this issue is figure out what is making the valve stay..
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