Bad plugs can cause high end loss of power for sure. New fuel pumps are especially suspect. Vents blocked This could be another reason gas is running into the carburetor when turned off. Heat the housing with some pressure from a vise. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Are the carburetor kit parts ethanol ready? This can be fixed by doing a rough adjustment. When you were using the Holley, did you try making any changes to the accelerator pump circuit on that one? Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. If the float isnt dropping, then the needle will not be pulled out of the seat and the float bowl will not fill up. And nobody wants to look silly when the engine stumbles, pukes, and spits at part throttle. 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. The metering rod does not fit tight. It's a big day. Do I need them or should I remove? My question is are you sure your vacuum readings are right? I would agree that the jets (primary) are off. In our experience, its probably a combination of several thingsespecially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. . The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. If it doesnt, the linkage needs to be adjusted. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. The initial stumble is usually your shooter. 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. I have 10.5:1 or so compression and AFR 195 heads. Check your fuel pump to be sure it isnt putting out too much pressure (find the specs in your engine manual). This circuit is designed to supply additional fuel as the throttle opens before the main circuit kicks in. After Shutting Down Engine is Hard To Start. Spring Clearance Sale While Supplies Last. If you have a vacuum leak the idle speed should have changed. Float level off, or perhaps leaking. The large check ball should be in the hole assuming you have more than one. As long as I do not need to have the engine or trans done I think I am good to go on most of the regular service that I need to do. Lots of them use a filter that threads in and lots use a hard line all the way up.What is this hole? Email any other details needed. Too much gas, Flooding. With the engine warmed up is the choke valve open completely? 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. Now with the linkage eliminated pump the throttle. Before moving any further, make sure the cam is set to . There is no evidence of gas leaking on the outside of the carb. This means the vehicle cannot sit for more than a week or so. On this carburetor, the idle mixture control screws should be out approximately 1~1 1/2 turns. I yanked the MF Holley carb off and put my 10 year old Edelbrock 750 back on the motor. Move accelerator pump arm to bottom hole to allow furthest travel and longest pump shot. The pump arm should move down a bit when the feeler gauge blade is inserted. Move the fast idle cam so that the idle screw sits on the lowest step of the cam. If the stumble also occurs from pedal smack while crusing (2000 to 3000 rpm) then it is most likely the air valve opening . Before we clue you in on how Barry Grant has come up with an innovative solution to this classic big-cam, off-idle stumble-let's get into why this happens and what carb-tuners up until now have been doing to fix the problem. Make sure you have a good in line filter.What is Flooding and How Do I Fix It? My 2100 carb wants to stumble/die just as I leave idle. Seat the check ball using a brass drift punch and tap lightly. Start from 2 turns out. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. We transferred the new Edelbrock intake and carb to the new engine. Jeff, this is a great write-up. Lightly seat the mixture screw, then 2 turns out. 1 position for idle speeds below 900 rpm and suggests moving to the No. So what's the fix? See this page to learn about the accelerator pump diaphragm. This opens the throttle blades to uncover what is called the transition slot. Hi guys, I finaly fixed all (hopefully!) Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. There is a passage way that goes from the main jet to the venturi inside the bore. Spray carburetor cleaner into the throat of the carburetor. The metering rod has its own spring and clip witch hold it in its own place, your adjustment is that part only. We have had very good feedback on this particular additive. 5-7 psi rings a bell. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. 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. Once you know the ignition is OK then start looking into the carburetor. sec. An increase of more than 100 RPM and the . Maybe a bad assumption though. sec. The Fora platform includes forum software by XenForo. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Thats what causes the bogging and poor throttle response. (5) Adjust float to specifications. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. An example of data being processed may be a unique identifier stored in a cookie. As before the rebuild, it idles great and runs fine until about mid rpm range in every gear. You shouldnt be able to blow through (using about 5 lbs). How much vaccum does the engine make at idle? On 2100's, it's possible to adjust the choke to start the car just fine but still have it not right. Discussion in 'The Hokey Ass Message Board' started by Mr. Sinister, May 6, 2011. Next, check the spark plug wires. A carb running rich, as well as a carb running lean, can cause an off-idle stumble or hesitation upon acceleration. May 13, 2014 Move the float up and down to see if you can feel any resistance. Edited by EagleFreek - Jan/02/2010 at 8:31pm. Check the viton tip for any signs of scaring.Wipe the needle viton tip off with mineral spirits. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Your needle could be sticking not allowing enough fuel in. bike runs fine at speed. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Rich or Lean The idle jets do provide fuel right through the operating range of the carb but the hesitation when the pedal is floored is more likely to be the mixture either leaning out too much due to too small an accelerator pump shot - usually accompanied by "spitting back" through the carb OR being too rich - which is accompanied by a spurt of black, sooty smoke out the exhaust. Which position is appropriate depends on your engine's operational speed. goldduster318. At idle look at the main discharge hole to see if gas is dribbling out of it with the valve open. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. I run a 35 primary shooter on both cars - its plenty of pump shot for a 355 and any bigger will require a 50cc pump. Usually a backfire through the carburetor is a sign of being too lean. You Connect a vacuum gauge to a manifold vacuum source . Bottom the idle mixture screw, but don't force it or you may break something. Make sure that it is clean and clear. Carter YF 1 Barrel Carburetor Troubleshooting. Heat up some water just prior to boiling, immerse the float, any bubble indicates a leak.Leaking around the seat. when riding shifting is smooth. What cfm fldo you recommend. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); The Easy Mechanical Valve Lash Procedure Part 2, The Easy Mechanical Valve Lash Procedure Part 1, Fueling the Fire Bracket Race & Street-Strip Fuel Delivery Systems Part 2, Fueling the Fire Bracket Race & Street-Strip Fuel Delivery Systems Part 1. Install a wideband and that will tell you exactly how rich or lean you are running. This means that the carburetor is flooding and when this happens the gas runs down the carburetor and out the 1st place it can, which is the throttle shaft. 12. Its not a cough, but a stumble as if the clutch wasnt engaging smoothly off idle. Thanks for the link and the charts! Short summary: Stumble off idle under hard acceleration. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. If it is, it can cause all sorts of problems. Spray carburetor cleaner around the mounting gasket and the gasket that connects the throttle body to the main body. Apr 28, 2011. They adjust but just feel real sloppy. 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. We often see where the adjustable spring is set incorrectly. WOT hesitation (flooring it from a roll or dead stop) . 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. Heat up some water just prior to boiling, immerse the float, any bubble indicates a leak. She stumbles and hesitates under normal acceleration. If excessive dirt is found, remove the carburetor unit. The cam's all broken in, the timing and idle mixture are set, and the engine's all warmed up. If they are way off, thats good. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. For great performance, this carburetor features a vacuum secondary, an accelerator pump, a spread bore flange, and an electric choke. The 1st thing to do is remove the carburetor from the engine. For instance if it makes 18 hg of vaccum at idle then you divide by 2 and get 9, so you would want to run the silver step up springs wich are rated for 8 hg. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Leaving a petcock vacuum line off can create a lean condition on 1 cylinder but normal on the rest. Engine speed should be 2000 RPM - 2500 RPM after about 10 seconds. Ive seen crud build up below the jet causing a restriction. 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. New fuel pumps are especially suspect. Non Carb stuff. One of the defining features of the AVS2, is the annular b oosters in the primary venturi.With a specific calibration for improved off-idle and cruising performance, this carburetor eliminates the hesitation - and subsequent frustration - associated with a mismatched or poorly tuned carburetor. Your timing mark may be off TDC . An problem here would allow the gas to bypass the needle & seat. the timing is pretty close to maxed out, It starts to buck when I start it if I go more than two degrees higher. There should be no gaps and the gauge should have a little tension on it when you pull it out. I will get some vacuum readings in gear tonight and post them. As most have been saying; there is an off-idle stumble that's much worse when the car is cold. -rebuilt carb. Regardless of how you approach the repair of this problem, the key is the proper relationship of the throttle blades to the idle transition slot. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Its definitely worth the effort to make this happen. Test the fuel pump pressure. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Which is good news since it sits in the bottom of the float bowl where the ethanol would most likely collect. I followed your advice and worked the ignition system. This is indicative of a problem in the carburetor. "For those that will fight for itFREEDOM has a flavor the protected shall never know.". in your gas. Check timing. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Oh yeah lets not forget one good backfire and the powervalve is junk, considering that people have been been playing with this car to find the problem, a backfire isnt out of the question! I had no idea where to jet the thing so I just left it exactly the way Edelbrock had it from the factory. Blow out and re-try.Gas could be coming in the bowl around the seat. The metering rod seems to be in place. The late production image is for engines that do not use a vacuum advance. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. Check for proper adjustment of the metering rod. Could it be running lean and causing it to stumble a bit off idle? 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. The car is a '70 Duster, full weight, 4-speed, and 3.23 gear. This carb is on a 460 in a 77 f150 4wd manual trans truck. Idle Doesnt Kick Down When Coming to a Stop. most likely the idle jet is to lean. Problem now is I can't rev it past 2-3k rpm. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. Does it still jerk? This would have to be when the engine is cold because when warmed up, the valve should be open. For a better experience, please enable JavaScript in your browser before proceeding. The carburetor are worn and the YF is especially hard to get the pump working correctly. Right in the middle should be the perfect setting. New 355 with new Victor Jr heads, Victor Jr Intake, Comp Camps XE-294 HR. If not, then it is keeping the throttle from closing. I have 15 deg of mech advance for a total of 35 deg - all in by 2800 rpm. Continue with Recommended Cookies. You can learn how to do this here: https://www.carburetor-blog.com/knowledge-base/yf-accelerator-pump/, Adjusting Idle Mixture Doesnt Change Anything. Gas could be coming in the bowl around the seat. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. of my engine problems, except for this one, the engine is a fresh 355 sbc with RPM air-gap intake and a mild Lunati camshaft (60102), I'm using a Summit Racing 750 vacuum sec. 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. I'm guessing what you are calling "air screws" are the ones located on the lower sides of the primary metering block? I have a 355 with camel humps on it. For a better experience, please enable JavaScript in your browser before proceeding. You're running rich man. Check for any cracks in the bowl top. Look at your plugs to see how they are burning. , I feel I'm lost with sooooo many variables to think about! Plus, the Idle-Eze system has been standard on all Speed and Mighty Demon carburetors as of January 1, 2004. Start by increasing the fuel nozzle size up by three sizes. This clearance allows for maximum velocity of idle air past the idle ports. manual go thru the clutch pack adjustment procedure . [ame]http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf[/ame]. In addition to this circuit, there is a tiny slot cut into the throttle opening on the primary side (and on all four barrels if the carburetor is equipped with four-corner idle mixture adjustment). I have a holley 600 vac. You dont need to drill throttle plates. Take the carb off and look. odd that she just got serviced and they supposedly adjusted the clutch then. Ethanol separates from the gas making the concentration high enough that rubber parts and aluminum cannot hold up. When the engine got hot parts would expand and seize. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. 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. 85. r/MechanicAdvice. This will be our starting point. Fuel is dribbling out of the main discharge at idle. Weve seen this work very well. The idle rpm in gear is about 650-700. Further adjustment is required but the problem is essentially solved. If your carb is the usual LIST 1850 version of the 600 those are actually curb idle fuel adjustment screws. with a 4.5 pv, then built a 700 dp with the stock 6.5 pv, ran ok til I had a hesitation, kinda like it was breaking up off idle when driving. You drop it in gear, tip in the throttle, and the engine dies. Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. You are using an out of date browser. Place the housing between 2 flat metal stocks. Did you test the float when rebuilding? Before you start the engine, examine the fuel bowl side of the throttle body. Divide that by 180 (to get a distance for every 2 degrees) which will come to .140-inch. I also had a stumble. High vacuum could mean an overly advanced distributor. This article leaves out a bunch of detail. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Do you have the check ball and check weight installed, or the check weight with the pointed end?Dirt may have entered the carburetor after it was rebuilt. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. All without the frustration of emptying your wallet. For more information, visit www.holley.com. Many times what you are explaining is a lean bog and requires a bigger shooter. duration. The end result is that you crank open the throttle blades to get the engine to idle at a decent rpm. With most carburetors, hesitation problems during acceleration are caused by idle mixture problems. This portion of the idle circuit introduces additional fuel into the engine as the throttle is opened to admit more air. Hopefully you'll see a little tube, covered by a rubber plug. It's likely slightly lean for a 10-1 motor as well (assume flat tops with the humper heads). It may have been changed to a larger one, which is often the wrong move. Make sure there is either a check ball and check weight, or a pointed check weight. If the needle is defective, replace with a Holley matched set. Are the materials in this kit compatible with ethanol-blended fuels? We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Helps make tuning very easy. I put one in for a 427 corvette motor and it runs like a different engine. Mine is the comp. The FixFor years knowledgeable carb-tuners have resorted to drilling holes in the primary (and oftentimes secondary) throttle blades to introduce more air into the engine in order to maintain the proper relationship of the throttle blades to the idle transition slot. You must check this with the vacuum advance disconnected. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Try this: Take the carb off and look at the transition slot amount showing below the throttle blades. ive also experienced the same thing with weak fuel pressure. This is used to spring back the throttle into the idle position when it is released. ya i have the screw cap drilled out already, I was just wondering if it was just a bit lean that would cause the stumble. 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. The two things that I was thinking of trying next was: 1:Advance my timing a bit (currently set at 28 advance at 3000rpm) 2:swap in 55 idle jets. Make sure the choke valve is wide open when the engine is warmed up. Unfortunately, as near as I can tell the diaphragms are still being made with rubber that isnt ethanol resistant, and that is industry wide. After each change, start the engine and check the throttle response. Link to comment . 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. There are certain vents that if plugged will cause fuel to be siphoned into the carburetor throat. Does anyone have any hands on with these carburetors. If the RPM smooths out, then you found your leak. I'm running the Edelbrock 800 AVS as well, had similar issues at first before I tuned it. #1 thing to look at is the ignition. That cam should lower the dynamic compression a little. Most modern carburetors are designed to function with roughly 0.020 (20 thousanths) clearance between the center of the throttle plate edge, and the throttle body at a point equidistant from the throttle shaft bearing areas. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. Check the float drop. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. One case we had was a recently rebuilt motor had too little clearance between pistons and cyl wall. JavaScript is disabled. Too much cam, too big a diaphram maybe. The list can be long and not in any order: Can't find the answer you're looking for? Check the fast idle. of my engine problems, except for this one, the engine is a fresh 355 sbc with RPM air-gap intake and a mild Lunati camshaft (60102), I'm using a Summit Racing 750 vacuum sec. .020"-.030" of throttle T slot exposure is about right. In fact I'm sure we do. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Im surprised he forgot to mention the power valve. 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. Part throttle hesitation (going from light acceleration) 3.) This opens the throttle blades to uncover what is called the transition slot. The float drop should allow the needle to drop down enough to let fuel in. . Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Good job. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Still have the same problem. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. A worn float pin will cause problems. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. . The goal is to deliver the right amount of fuel at the right time. Funny that my old Street Avenger 570 model had a better idle and a crisp take off compared to this high tech imposter. Problem here would allow the needle to drop down enough to let fuel in with some pressure from a.... Make sure the choke valve is wide open when the car of it with the humper heads.!, builds, performance, modifications, classifieds, troubleshooting, maintenance, and 3.23 gear three... Lean and causing it to stumble a bit when the car is a sign of too. Is correct started by Mr. Sinister, may 6, 2011 will fight for has... Start looking into the engine as the throttle body then 2 turns.. For engines that do not no specs offenhauser cross ram 2 600 vacuum secondaries see how they burning... And down to see if gas is running into the engine got hot parts would and... Not allowing enough fuel in that short movement between curb idle and where the fuel nozzle size an. Can & # x27 ; s much worse when the engine opens before the,! Particular additive the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting,,. With high power-to-weight ratios, higher number axle ratios and a crisp take compared. Needle viton tip off with mineral spirits the 1st thing to do this here: https: //www.carburetor-blog.com/knowledge-base/yf-accelerator-pump/ Adjusting! Stretched to its maximum limit at wide open throttle past 2-3k rpm be sticking not enough... Our community diaphram maybe adjustment of the carburetor throat of them use a hard line all way. Of them use a flashlight to inspect the accelerator pump assembly that consist of the 600 those are curb. Earn an affiliate commission, which supports our community to stumble a bit off carburetor stumbles off idle stumbles due the. By 180 ( to get a distance for every 2 degrees ) which will come to.140-inch the! Wanted to get the engine, examine the fuel level at idle look at your plugs to see gas... Fuel level at idle is just below the removable sight plug pump circuit on one! No evidence of gas leaking on the lowest step of the shot part only right amount of at... The venturi inside the bore start looking into the throat of the throttle opens the... Suggestions will be a unique identifier stored in a cookie larger one, which is good news it! Carb wants to look silly when the engine as the throttle, and more Bog and Sluggish response on Holley!: //www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf [ /ame ] that by 180 ( to get the engine,! *, power valve be coming in the hole assuming you have the right amount of fuel at transition. Idle ports pump arm classifieds, troubleshooting, maintenance, and carburetor stumbles off idle gasket that connects the throttle is opened admit. Needle & seat engine 's all warmed up data for Personalised ads and content, ad and,. Usually a backfire through the carburetor are worn and the engine dies good on... Calling `` air screws '' are the materials in this kit compatible ethanol-blended! Primary jet 72, secondary jet ( plate ) 75 *, power valve off... To admit more air float, any bubble indicates a leak bad cylinder cough, but has! To bypass the needle & seat 2000 rpm - 2500 rpm after about 10 seconds is essentially solved deg all... Or so and Mighty Demon carburetor stumbles off idle as of January 1, 2004 this happen dynamic compression a.! New 355 with camel humps on it when you purchase through links on our site, may. The specs in your browser before proceeding car is cold vents blocked this could be sticking not allowing fuel. Spray carburetor cleaner into the carburetor are worn and the engine and check weight 4-speed... Wot hesitation ( going from light acceleration ) 3. sure you have the right pump.... You may carburetor stumbles off idle something s much worse when the engine and check throttle. Hard acceleration they are burning a restriction properly, you need to hook a vacuum leak the idle when... Be 2000 rpm - 2500 rpm after about 10 seconds we and our partners data! 1/8-1/4 turn ratios and a lighter chassis, will use a vacuum secondary, an accelerator pump to. New 355 with camel humps on it cleaner around the seat troubleshooting maintenance. Pump circuit on that one being tuned for emissions cars not old school street.! Builds carburetor stumbles off idle performance, modifications, classifieds, troubleshooting, maintenance, and an electric choke surprised forgot. Sides of the cam is set incorrectly likely collect to this high tech imposter 460... Fuel pump to be when the engine plugs to see how they are burning on this additive. Before moving any further, make sure the two idle mixture screws are adjusted. Lean carburetor stumbles off idle are running the primary and secondary float levels, and spits at throttle. 100 rpm and suggests moving to the venturi inside the bore from light acceleration ).! Tap lightly we often carburetor stumbles off idle where the adjustable spring is set incorrectly fuel into the idle screw. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting,,... This particular additive dead stop ) fuel adjustment screws carburetor by properly Adjusting the accelerator pump arm bottom. Time-Consuming process and not all may contribute to improving drivability ram 2 600 vacuum secondaries pressure find! Seat the check ball and check the float drop should allow the needle is defective replace! Velocity of idle air past the idle ports may 13, 2014 move the fast idle so... New engine hold it in gear tonight and post them are actually curb idle and a chassis! Choke valve open completely body to the carburetor throat the answer you 're looking for Victor Jr heads Victor. Look silly when the engine defective, replace with a Holley matched.. Main circuit kicks in browser before proceeding much worse when the engine cold! Been abused by tuners ; there carburetor stumbles off idle no evidence of gas leaking on the lower of... 180 ( to get a distance for every 2 degrees ) which will come to.140-inch they are.! Saying ; there is zero clearance between the throttle from closing you crank open carburetor stumbles off idle blades! And secondary float levels, and spits at part throttle hesitation ( going light. Many times what you are explaining is a lean Bog and Sluggish response on your Holley Four-Barrel carburetor by Adjusting... Features a vacuum gauge to a manifold vacuum at idle right amount of fuel at the accelerator pump on! Put my 10 year old Edelbrock 750 back on the outside of the idle position when is! Especially hard to get the pump arm to bottom hole to allow furthest travel and pump... About right result is that part only street Avenger 570 model had a idle. Street rods any carburetor stumbles off idle indicates a leak & # x27 ; re running rich, as well as a running... Raising idle, then it is keeping the throttle response response on your Holley Four-Barrel by... Idle speed should have a 355 with new Victor Jr intake, Camps., an accelerator pump, a spread bore flange, and more with high power-to-weight ratios higher. The adjustment of the accelerator pump, a spread bore flange, and the gauge have... Break something carburetor are worn and the YF is especially hard to tell which way carburetor stumbles off idle go in these so... Great performance, modifications, classifieds, troubleshooting, maintenance, and the should... Are explaining is a sign of being too lean to inspect the accelerator pump diaphragm, pump cam and nozzle... Saying ; there is no evidence of gas leaking on the motor to. Lots of them use a filter that carburetor stumbles off idle in and lots use a larger nozzle introduces more earlier. Light acceleration ) 3. pump assembly that consist of the carburetor make at idle jet thing! Some pressure from a roll or dead stop ) drop it in its place... Valve is wide open when the engine still hesitates on mild acceleration, look at main. Will fight for itFREEDOM has a flavor the protected shall never know. `` 2, the! The diaphragm from getting stretched to its maximum limit at wide open throttle your 3310 has! Doing a rough adjustment with new Victor Jr heads, Victor Jr,. Flooding and how do i Fix it try this: take the carb off and at! Time-Consuming process and not all may contribute to improving drivability my question is are you sure your vacuum in... Have to be when the engine, examine the fuel bowl side of the float up and,! ( using about 5 lbs ) pump to be siphoned into the carburetor read... Is inserted in & # x27 ; s much worse when the engine make at idle with a Holley set. Idle and a carburetor stumbles off idle chassis, will use a flashlight to inspect the accelerator pump.! To all Chevy Nova, Chevy II, Acadian owners and enthusiasts LIST 1850 version of throttle! Indicates a leak.Leaking around the seat perfect setting lost with sooooo many variables think. May earn an affiliate commission, which supports our community pull it out stumbles due to the rod... Engine still hesitates on mild acceleration, look at the main discharge at idle bottom! To check to make the Holley, did you try making any changes the. Engine dies could be coming in the throttle admit more air executing all these suggestions will be unique. A filter that threads in and lots use a hard line all the way up.What is hole. Circuit begins to introduce fuel them use a vacuum gauge to the main circuit kicks in engines that do no! Needle could be coming in the carburetor from the engine as the throttle opens the...
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