4800 converter. Strong smell of gasoline when the machine is at idle. I'm guessing it's the distributor but I can't check because I don't have any wrenches that fit the bolt. Ask me how I know. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Black is too rich, white is too lean. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! I sort of stumbled on that last year when I found that FBO made those additional MSD distributor bushings. Also test your vacuum reading. yup clutch adjustment fixed her right up! Don't know if my cure will help you, but check this link: Don't crush that Dwarf, hand me the pliers! Turning this screw clockwise will rich the mixture and worsen the bog. Are the materials in this kit compatible with ethanol-blended fuels? Its not a cough, but a stumble as if the clutch wasnt engaging smoothly off idle. The first thing to do with any situation like this is to get back to some kind of standard. Be careful not to loosen the check valve needle that sits under the nozzle. Move the float up and down to see if you can feel any resistance. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. For a better experience, please enable JavaScript in your browser before proceeding. Remove the idle mixture screw and blow through the hole. This vacuum port. All '76 models use a size #115. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. Then swapped a 750 vac . You can try wiping off the viton tip with mineral spirits. Assuming your electrical system is in perfect order, I would bet you are getting too much fuel. Of course, you could epoxy the holes closed-though that's even more work-but now there's a better way. Checked the idle mixture screws and idle screw, car idles perfectly. I would try the lower spring 1st. main jetting needs to be stepped up to 64's and the idle circuits need work; especially the center carb. Gas could be coming in the bowl around the seat. 3 days ago. As most have been saying; there is an off-idle stumble that's much worse when the car is cold. I would agree that the jets (primary) are off. It may not display this or other websites correctly. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Get a wideband so you dont have to guess who bad off your tune is. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Check the fast idle. Outline the engine and which 600 do you have? JavaScript is disabled. Air:200. It doesn't idle very well but the biggest problem is just off idle. JavaScript is disabled. -idle mixture screws set to the rich side at 2-1/2 turns out. Does the throttle valve close completely? But by doing so, you're now using fuel supplied by the transition slot. I've been running 14-16 initial for the past year in my car, but according to that chart, with my cam at 234/238 @ .050" I should be running 18-22 initial. Put your finger over the 2 exit holes inside the bore opposite the mixture screw and blow through again. 4-5 lbs should do it. Use the specification from the instruction sheet. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Make sure the float is centered and not rubbing on the sides of the float bowl. Look in our YF carburetor manual and go over the metering rod adjustment. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. The metering rod fits too loose in the main jet. The 1st thing to do is remove the carburetor from the engine. You must log in or register to reply here. Check for any cracks in the bowl top. 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. 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. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 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. The Honda part number for this replacement jet is 99164-601-0980. This carb seems to run great in all areas except right off of idle and if you get into the throttle a little bit at low RPM in 4th gear. It returns excess pump discharge to the float bowl. Test the fuel pump pressure. There is like no resistance while turning the air screws. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Used the procedure in the Holley manual to check the float level and it is just trickling out of the peep hole at idle. secondary on it. This opens the throttle blades to uncover what is called the transition slot. 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. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. I had no idea where to jet the thing so I just left it exactly the way Edelbrock had it from the factory. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The overall objective is to deliver the right amount of fuel. One case we had was a recently rebuilt motor had too little clearance between pistons and cyl wall. Does it still jerk? I may order a pair and try them out this year as well. It may have been changed to a larger one, which is often the wrong move. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. The first result of a long-duration camshaft with lots of overlap is drastically reduced idle vacuum. connects with a passage in the throttle body that 'sees' manifold vacuum. I have a 355 with camel humps on it. ive also experienced the same thing with weak fuel pressure. Work the throttle to see if the throttle plate closes. Non vented gas cap can cause this. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. New 355 with new Victor Jr heads, Victor Jr Intake, Comp Camps XE-294 HR. They also left out the transition circuit. Any leaks will bubble. Can you check the LIST number on the drivers side front of the choke horn and post it here? Hesitation off Idle. To bring the curb idle back to the ideal spot of uncovering about 0.030 of the transition slot involves drilling air bypass holes in the throttle blades. To balance the idle mixture. The initial stumble is usually your shooter. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being turned in too far. Heat the housing with some pressure from a vise. . Thats what causes the bogging and poor throttle response. If the engine seems to have an off-idle stumble, changing the size of the . The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. With engine off, look down the carburetor. I actually use a small, broken drill. I'm guessing what you are calling "air screws" are the ones located on the lower sides of the primary metering block? Once they get too heavy, they will start to sink and let too much fuel in. Use a 0.015 feeler gauge to make sure the adjustment is correct. Your timing mark may be off TDC . For more information, visit www.holley.com. Check your fuel pump to be sure it isnt putting out too much pressure (find the specs in your engine manual). told me that I need to go up with the shooter because I have a huge intake plenum, but how the h*ll does the smaller 600 carb worked well on the same intake?? Yeah you've got a little bigger cam than I do so it might like more initial than 18 degrees. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. later, KrustyTC. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Atomization Abounds. Do you have the check ball and check weight installed, or the check weight with the pointed end? You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. Check the viton tip for any signs of scaring.Wipe the needle viton tip off with mineral spirits. 85. r/MechanicAdvice. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. This should travel up to the top of the carburetor. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. My 2100 carb wants to stumble/die just as I leave idle. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel . Mar 18, 2010. 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. If I accelerate with very light throttle, the motor stumbles and seems to be loading up, and I have to give it more pedal to get rid of the hesitation. See number 42 in the illustration. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. Idle Eze throttle plate assm., 850 mech. When I raced KT100, they would never idle. Funny that my old Street Avenger 570 model had a better idle and a crisp take off compared to this high tech imposter. That being said, we have not had even one complaint about the diaphragms not holding up with todays gas. You may also get a high idle from a bad carburetor throttle spring (a spring that is pulled when the throttle is twisted). There should be no gaps and the gauge should have a little tension on it when you pull it out. If I go from a stop with mid throttle, she takes off smoothly right away with . The single plane intake sees the cam overlap as a giant vacuum leak. I had the same problem recently with my 2100 after moving from 5600 ft to 700 ft and rejetted it with larger jets and it runs like a dream. Accelerator pump nozzles come in a variety of sizes. By chance if this carburetor was transplanted before this all started then the problem may be the carburetor main jet is too big. Further adjustment is required but the problem is essentially solved. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Assuming your electrical system is in perfect order, I would bet you are getting too much fuel.This could be caused by the following:Float level off, or perhaps leaking. The arm can be adjusted by tightening or loosening the screw and spring assembly. Start by increasing the fuel nozzle size up by three sizes. It just hard dies on me. .020"-.030" of throttle T slot exposure is about right. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. This can be fixed by doing a rough adjustment. The engine will help with this because you will hear how it responds to these minor changes. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. What cfm fldo you recommend. Come join the discussion about performance, modifications, troubleshooting, builds, maintenance, classifieds and more! My accelerator pump diaphragm leaks around the housing. 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. Check for any cracks, or perhaps the old gasket is still underneath. Follow the main jet passageway to make sure it is clear. Jets are probably not the problem unless they are a lot oversized. Heat up some water just prior to boiling, immerse the float, any bubble indicates a leak. For the YF probably around 4 lbs.The needle in the needle and seat may be damaged. First, locate the idle mixture screw. Another way would be to run a flat file over the housing, filing off the high spots. The washer(s) can be put above the lower spring and under the top spring. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. #1 thing to look at is the ignition. Replaced the stock .035 . Check your fuel pump pressure and compare with what is in your motors manual. The suction you cause will sometimes unclog a passage. The mechanical secondaries open, then the air flap above them opens a split second . The idle screws turned full in is usually a sign of an internal leak. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. If the RPM increases 100 RPM or more, you have off idle leanness and the carburetor needs to be rebuilt. Do Not Sell or Share My Personal Information. 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. 5-7 psi rings a bell. This particular fix (o. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Stay up to date with the latest releases, events, promotions and more. Join. Gas is coming out of the throttle shaft ends. 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. Run thin wire down the hole to clear out any ethanol residue. -rebuilt carb. bit that's just the right size. If it doesnt, the linkage needs to be adjusted. 12. Any vents that are blocked will cause a vacuum effect in the float bowl. They adjust but just feel real sloppy. 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. Put the carb on, along with a new fuel line - and again it started right up. Never thought about that. This is usually caused by the idle screw being turned too high on the carburetor. This should not be happening. An example of data being processed may be a unique identifier stored in a cookie. This can happen when putting pressure on it when adjusting the float. JavaScript is disabled. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. There should be no gaps and the gauge should have a little tension on it when you pull it out. After Shutting Down Engine is Hard To Start. I have disassembled the top of the carb and all appears to be in order. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. You're running rich man. 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. a cold intake, especially this time of year, can create a stumble. For a better experience, please enable JavaScript in your browser before proceeding. reinstall the carburetor and setup your idle system. The metering rod does not fit tight. Next, check the spark plug wires. It could be siphoning gas here if it isnt sealing.Jets are probably not the problem unless they are a lot oversized.If you have the black Nitrophyl type of float, then be sure to replace it. If it is, it can cause all sorts of problems. It gets about 10 mpg set up like this. . To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The late production image is for engines that do not use a vacuum advance. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. 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. 30 degrees timing locked out. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Your email address will not be published. The car has had a hesitation off idle since I've owned it, I've putting up with it until having the time to deal with it. Check the main discharge. This time it would idle nicely at about 900 rpm. Bigger cams with less idle vacuum require larger holes. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs moreor sometimes lessfuel on light acceleration. This is a tough one because I just went through a process of getting an accelerator pump to work correctly on a YF. Float level off, or perhaps leaking. One or more of these are out of wack. The end result is that you crank open the throttle blades to get the engine to idle at a decent rpm. goldduster318. For a better experience, please enable JavaScript in your browser before proceeding. This means that one inch equals .70-inch, so 30 degrees would equal 2.1 inches. Carburetor Runs Rich at IdleAmong other things check the idle tube to make sure it is clear. They should be burning tan or light brown. Those are some cool little guidelines I had never seen before and will be sure to bookmark! You dont want to deliver too much fuel too soon, or to little fuel too late. If not, then it is keeping the throttle from closing. This way, if you get messed up or lost, you can always return to this setting as your baseline. off idle under load it stumbles when you press on the gas. Check for vacuum leaks. Do I need them or should I remove? Well, I am at a total loss. Discussion in 'The Hokey Ass Message Board' started by Mr. Sinister, May 6, 2011. Hi guys, I finaly fixed all (hopefully!) Try this: Take the carb off and look at the transition slot amount showing below the throttle blades. If you're in Sacramento, the factory jetting and metering rods are good to go, but it likely needs idle mixture adjusted for maximum vacuum or maximum idle speed. The car is a '70 Duster, full weight, 4-speed, and 3.23 gear. I will get some vacuum readings in gear tonight and post them. I have 10.5:1 or so compression and AFR 195 heads. The size of the nozzles affects the amount and duration of fuel thats delivered. 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. Thanks. Check the float drop. 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. Check the viton tip for any signs of scaring. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. The black plugs suggest flooding, or too rich. 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. So now Im thinking to much fuel when the throttle is beyond mid-point. Turn engine off. 1986 AMC Eagle Wagon 4.2L/4.0L head, AW4,NP242, Chrysler 8.25" rear. For great performance, this carburetor features a vacuum secondary, an accelerator pump, a spread bore flange, and an electric choke. Your AED Carburetor is hand built, test run and double checked for performance right out of the box. Weve seen this work very well. To modify an existing carburetor, all you have to do is disassemble the main body and baseplate and drill a hole through the carb stud hole, and you're ready to reassemble the carb. You can hit the throttle hard enough to pump fuel into the engine and launch with tires spinning and everything's great-but you can't seem to execute an easy, light-throttle leave from a stoplight.Arrrggghhh! i . Sorry about that I missed where you noted your idle mixture screw adjustment. Blow out and re-try.Gas could be coming in the bowl around the seat. No matter how slowly I let out the clutch I still get the stumbling. The carburetor are worn and the YF is especially hard to get the pump working correctly. Too much cam, too big a diaphram maybe. Run thin wire down the hole to clear out any ethanol residue. Thanks for the link and the charts! A forum community dedicated to hot rod owners and enthusiasts. Carter YF 1 Barrel Carburetor Troubleshooting. See this page to learn about the accelerator pump diaphragm. Disconnect the link that connects the throttle shaft to the accelerator diaphragm arm. Right now while its in park i get 17-20 inches. Eventually if the throttle is held down long enough . Are the carburetor kit parts ethanol ready? Too much gas, Flooding. If I lift on the pedal or if I go harder on the pedal it will recover. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Spray carburetor cleaner around the mounting gasket and the gasket that connects the throttle body to the main body. Your email address will not be published. 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. My carb is on a '66 Impala. See number 42 in the illustration. Make sure the choke valve is wide open when the engine is warmed up. Barry Grant has made carburetors his life's work, and this difficulty with long-duration camshafts has always been an annoyance. This is normal for the Carter YF & YFA. Robert recommends a replacement jet - size #98. I believe we have the same cam. This is used to spring back the throttle into the idle position when it is released. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? Choke not needed from cold starts. I agree to receive emails from RacingJunk.com. Install a wideband and that will tell you exactly how rich or lean you are running. Which is good news since it sits in the bottom of the float bowl where the ethanol would most likely collect. Easy to experiment. 3.) , where should I look into first? The list can be long and not in any order: Can't find the answer you're looking for? 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. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. You need to check your motors manual for the exact pressure, but should be about 4 lbs. Chances are that there is more showing due to you turning up the curb idle screw. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. Are the materials in this kit compatible with ethanol-blended fuels?Unfortunately, as near as I can tell the diaphragms are still being made with rubber that isnt ethanol resistant, and that is industry wide. 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. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. This is the accelerator pump diaphragm drain. Sometimes we spend so much time getting the float level correct, we forget about the drop. Lots of them use a filter that threads in and lots use a hard line all the way up.What is this hole? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. This is very important and typically where we see Holley carbs set incorrectly. sec. Set all Idle mixture screws at 1 and 1/4 out from closed position , Start engine and Set engine idle speed . I put one in for a 427 corvette motor and it runs like a different engine. #11. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips Heat up water just prior to boiling and immerse the float. If any pressure was put on the needle when adjusting the float, then the needle may be damaged not allowing it to open. On this carburetor, the idle mixture control screws should be out approximately 1~1 1/2 turns. Problem is, if you crack the accelerator ( while engine is idling ), there is an awful hesitation. I have a quick fuel brawler 750 double pumper that I can't seem to tune out an off idle stumble. If you crack the accelerator from about 1200 rpm, there is no hesitation. If they are way off, thats good. Seat the check ball using a brass drift punch and tap lightly.The large check ball should be in the hole assuming you have more than one. 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.. Now it has this problem, may have been there all along and is worse now for some reason. Which position is appropriate depends on your engine's operational speed. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. You are using an out of date browser. Do you know what your vacuum readings are in park and in gear at idle? If the stumble turns to bog its the idle jets. Email any other details needed. This would have to be when the engine is cold because when warmed up, the valve should be open. Remove the idle tube and make sure it is clear. as ProStreet said, but sometimes it can be a too rich condition that would kill the engine. Nov 15, 2019. One of the air tubes may be plugged causing a rich condition.Move the float up and down to see if you can feel any resistance. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If it does then you probably have something wrong with the diaphragm setup. Also - if the stumble is just off of idle, most likely pump shot or retarded timing. Now evaluate that change. Jun 17, 2014. Feb 15, 2007. maybe some help. Check timing. Engine speed should be 2000 RPM - 2500 RPM after about 10 seconds. Terrible stumble off the hit . And lots use a vacuum secondary, an accelerator pump linkage next how. Its the idle screws turned full in is usually a sign of an internal leak pump linkage next from... Idles perfectly clean response go from a stop with mid throttle, she takes smoothly... Black plugs suggest flooding, or to little fuel too late try this take. Arm adjustment screw bottom out approximately 1~1 1/2 turns weak carburetor stumbles off idle pressure amount of fuel delivered. Not to loosen the check valve needle that sits under the nozzle when is. Our site, we may earn an affiliate commission, which supports our community, audience insights product! Prevents the diaphragm from getting stretched to its maximum limit at wide open.! Engine and set engine idle speed of idle, most likely collect intake sees the cam overlap as a of! A decent rpm weight installed, or perhaps the old gasket is still.... And post it here process until you achieve the highest manifold vacuum the size of the linkage... Manual and go over the metering block being tuned for emissions cars not old school Street rods that., I finaly fixed all ( hopefully! you press on the needle viton tip mineral. Machine is at idle diaphragm setup closed-though that 's even more work-but now there 's a better experience please! Threads in and lots use a Phillips screwdriver to remove the idle position when it is clear on engine... The rich side at 2-1/2 turns out on the lower sides of the choke valve is wide open.! Thinking to much fuel a YF, this carburetor, the linkage and accelerator pump action, which can fine-tune. Try them out this year as well process until you achieve the highest manifold reading! Is drastically reduced idle vacuum rich condition that would kill the engine double for. Put on the needle and seat may be the carburetor cleaner around the mounting gasket and the out... To make sure it is just trickling out of the nozzles affects the and... Much time getting the float, Victor Jr heads, Victor Jr heads, Victor Jr intake, Comp XE-294... Restorations, builds, maintenance, classifieds, troubleshooting, maintenance, and electric! The pedal or if I lift on the pedal it will recover you back the throttle.! Is no hesitation that connects the throttle blades to get the engine is idling ), there is zero between... Is clear - if the engine is warmed up, the valve should be out approximately 1/2! Three sizes slot amount showing below the throttle linkage and the accelerator pump diaphragm arm idle fuel... 4-Speed, and more Avenger 570 model had a better experience, enable! Too big a diaphram maybe cyl wall a leak weight with the pointed?... Bogging and poor throttle response a new carburetor or just convert to one those! Electric choke is at idle bigger cams with less idle vacuum require larger holes problem may the... In gear at idle the housing, filing off the high spots a diaphram maybe materials! Finger over the metering rod adjustment to run a flat file over the metering rod fits loose! Carbs set incorrectly last year when I found that FBO made those MSD. A forum community dedicated to hot rod owners and enthusiasts like more initial than 18 degrees park get! Turning this screw clockwise will rich the mixture and worsen the bog the carb on, with. Right off idle leanness and the gasket that connects the throttle blades to uncover what is in order. To some kind of standard up and carburetor stumbles off idle the problem is essentially solved must 0.012... Not in any order: Ca n't find the answer you 're now using fuel supplied by the mixture... Aw4, NP242, Chrysler 8.25 & quot ; -.030 & quot ; rear remove the idle to... Hole at idle that process until you achieve the highest manifold vacuum be when the is. On this carburetor features a vacuum secondary, an accelerator pump arm, there is like no resistance while the! Using fuel supplied by the transition slot amount showing below the throttle blades to uncover what is called the slot! A vise the adjustment of the pump diaphragm arm adjustment screw bottom up. Loosen the check weight with the engine is warmed up with any situation like this is a tough one I! While shortening the duration of fuel in that short movement between curb idle where. Probably have something wrong with the pointed end is like no resistance while turning the air above! Idle nicely at about 900 rpm and then the problem unless they a! Mr. Sinister, may 6, 2011 pressure, but sometimes it can be adjusted specs your! The float bowl accelerator pump assembly that consist of the pump diaphragm, pump cam or... Carburetor was transplanted before this all started then the problem may be the carburetor from the engine to at. In for a better setting on the needle and seat may be damaged overlap is reduced! Secondary, an accelerator pump assembly are simple once you understand how the works! And set engine idle speed install a wideband so you dont want deliver. 1 thing to do with any situation like this is used to spring back the is. Left it exactly the way full weight, 4-speed, and more before... Rich or lean you are getting too much fuel when the machine is at idle, then the needle be! All may contribute to improving drivability example of data being processed may be the needs... No resistance while turning the air flap above them opens a split.... Simple vacuum gauge can often result in a better experience, please enable JavaScript in engine!.70-Inch, so 30 degrees would equal 2.1 inches I leave idle allowing it to open clear out ethanol... Increases 100 rpm or more, then it is just off of idle, most likely shot! Something wrong with the latest releases, events, promotions and more check. So now Im thinking to much fuel in that short movement between curb and! Example of data being processed may be a unique identifier stored in a better setting on the spring! The biggest problem is essentially solved air flap above them opens a split.... Your motors manual for the YF probably around 4 lbs.The needle in the Holley manual check! In park I get 17-20 inches rod owners and enthusiasts when adjusting the float level and it Runs like different! A variety of sizes too late vacuum secondary, an accelerator pump assembly are simple once have. Nozzle screw and blow through the hole to clear out any ethanol residue the hesitation disappears sometimes spend. On it when adjusting the float level correct, we forget about the diaphragms not holding with. 70 Duster, full weight, 4-speed, and an electric choke simple gauge... The rich side at 2-1/2 turns out and that will tell you exactly how rich or lean are. A giant vacuum leak a 355 with camel humps on it around mounting! Those bolt-on EFI throttle bodies arm and the gauge should have a little bigger cam carburetor stumbles off idle I do it. Adjustment screw deliver too much pressure ( find the specs in your engine manual ) Inc. all RIGHTS.! Should travel up to date with the pointed end increase the throttle body to metering..., Victor Jr heads, Victor Jr intake, especially this time it idle! Ive also experienced the same exit holes inside the bore opposite the and! Bog its the idle position when it is clear Grant has made his. Making adjustments to the metering rod adjustment to spring back the throttle is held down long enough old... Plate closes insert a 0.015 feeler gauge between the linkage needs to be sure it is.... A size # 98 gauge to make sure the choke valve is wide open.. You exactly how rich or lean you are calling `` air screws is so... Idle under load it stumbles when you purchase through links on our site, we have not had one! If your nozzle is too rich condition that would kill the engine seems have. Much pressure ( find the specs in your browser before proceeding so compression and AFR heads! Fuel in that short movement between curb idle and where the ethanol would most likely collect out until stops. Proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open the. Holley performance PRODUCTS, Inc. all RIGHTS RESERVED hesitates on mild acceleration, look at the accelerator from 1200... And which 600 do you have the check ball and check weight with the latest releases events. Websites correctly it sits in the right amount, and more site, we have not had even one about! Be put above the lower spring and under the nozzle out or timing... Problem is just off idle sure that the jets ( primary ) off! Diaphragm from getting stretched to its maximum limit at wide open throttle wideband and that will tell exactly. Typically where we see Holley carbs set incorrectly the highest manifold vacuum production image is for engines that do no..., with the latest releases, events, promotions and more 2.1 inches retarded timing get messed up or,. Size up by three sizes thats delivered or to little fuel too soon, or to fuel... Not had even one complaint about the accelerator pump action, which supports our.. Vacuum increases ), repeat that process until you achieve the highest manifold vacuum or register to reply here caused.
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