The answer is amazingly simple. fj40 stumbling. A non vented cap will cause a suction. After reading, I noticed the OP says he has the XE294HR. Im surprised he forgot to mention the power valve. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. It's a big day. 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! Before you start the engine, examine the fuel bowl side of the throttle body. It doesnt matter as long as youve assembled the pump correctly, the pump has its own spring and retainer clip witch hold the pump in place. Your needle could be sticking not allowing enough fuel in. thanks for the advice guys, i will check and let you know what i come up with. You have a big single plane intake, and big cam. I've adjusted the idle mixture screws for max vacuum at idle. Get a wideband so you dont have to guess who bad off your tune is. If you have the black Nitrophyl type of float, then be sure to replace it. The overall objective is to deliver the right amount of fuel. JavaScript is disabled. It also prevents the distributor advance from operating, causing a late timing issue. 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. You shouldnt be able to blow through (using about 5 lbs). Now evaluate that change. Well assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. New 355 with new Victor Jr heads, Victor Jr Intake, Comp Camps XE-294 HR. That being said, we have not had even one complaint about the diaphragms not holding up with todays gas. Wait until the engine returns to the previous idle. 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. Used the procedure in the Holley manual to check the float level and it is just trickling out of the peep hole at idle. Nothing aggressive, just pulling off from a stop, like . Check the main discharge. The black plugs suggest flooding, or too rich. Make sure you have a good in line filter.What is Flooding and How Do I Fix It? Set them both the same at about 1 turns counterclockwise from fully seated. Heat up water just prior to boiling and immerse the float. Any leaks will bubble. Keep in mind I'm using a Holley style carb. Heat the housing with some pressure from a vise. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The engine will help with this because you will hear how it responds to these minor changes. To adjust turn fast idle screw in to increase fast idle speed and . 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!) Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Make sure the choke valve is wide open when the engine is warmed up. Nov 15, 2019. Spring Clearance Sale While Supplies Last. The large check ball should be in the hole assuming you have more than one. 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. Look at the tip of the needle. The car is a '70 Duster, full weight, 4-speed, and 3.23 gear. 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. Spray carb cleaner around the mounting, where the throttle body meats the float bowl, any vacuum lines and the intake manifold. The beauty of this idea is that it is fully adjustable so it can work on an engine with the wildest cam and then just as easily be bolted on an engine with a stock cam merely by closing the Idle-Eze valve. How much vaccum does the engine make at idle? Engine speed should be 2000 RPM - 2500 RPM after about 10 seconds. I yanked the MF Holley carb off and put my 10 year old Edelbrock 750 back on the motor. goldduster318. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Run's like a scalded dog though, lol. Bump the timing ahead a few degrees at a time untill it pings and then back it off a little . This means the vehicle cannot sit for more than a week or so. After each change, start the engine and check the throttle response. carb and the car performs really well, except for off-idle stumble, when I hit the gas hard it stumbles and most of the . JavaScript is disabled. 4-5 lbs should do it. The cam's all broken in, the timing and idle mixture are set, and the engine's all warmed up. When the temps change you have to change your jetting although you can easily take away that bog (rich) by leaning out the air screw. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. This is not the off idle lean stumble that can usually be tuned out with pump shot and idle adjustments. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. J.P. Jeff Smith: J.P., we can definitely help you. Thanks for the link and the charts! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. When you were using the Holley, did you try making any changes to the accelerator pump circuit on that one? It may not display this or other websites correctly. It should be about 4 lbs. That's when they ran their best on the track. Sometimes wiping the needle viton tip with mineral spirits will help. Sometimes these get misplaced, which can contribute to accelerator circuit drivability issues because the missing valve allows fuel to drain back to float level which can cause an intermittent hesitation. in your gas. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. See number 42 in the illustration. If you crack the accelerator from about 1200 rpm, there is no hesitation. It may have been changed to a larger one, which is often the wrong move. The 1st thing to do is remove the carburetor from the engine. An example of data being processed may be a unique identifier stored in a cookie. if this just started , I would check out the accelerator pump. 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. Feb 15, 2007. maybe some help. The passage is small and can plug easily. (Image/Holley). 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. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Simply replace the Pilot Air Jets (one per carb) with a smaller jet to enrich the idle circuit slightly. She stumbles and hesitates under normal acceleration. Also changed idle, everything. This way, if you get messed up or lost, you can always return to this setting as your baseline. My 2100 carb wants to stumble/die just as I leave idle. The fast idle opens the throttle valve so that more air is used. Thats what causes the bogging and poor throttle response. Sometimes we spend so much time getting the float level correct, we forget about the drop. The answer is amazingly simple. Do not plug it off. So Grant came up with an elegant solution he calls the Idle-Eze system. That's usually a lean condition. Link to comment . Wadd2 those are the bushings I was referring to. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. All without the frustration of emptying your wallet. Ask me how I know. Float level off, or perhaps leaking. Move the float up & down by hand to see if it catches anywhere. If it does then you probably have something wrong with the diaphragm setup. 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. Gapping the points to factory specs brought the dwell down to just under 40 deg. Also make sure that the small check valve is still located beneath the nozzle. It seems to have a stumble when you mash the gas. I purchased and installed the rebuild kit I received from you for my YF2100S carburetor. Too much gas, Flooding. Now he serves as a regular contributor to OnAllCylinders. Run thin wire down the hole to clear out any ethanol residue. They also left out the transition circuit. Check the float drop. i preferred a .025" squirter with tubes and a white 218 pump cam when i was running 6paks. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. 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. All other tune up procedures have been performed and the carbs synced with Morgan Carb tune. Do Not Sell or Share My Personal Information. Part throttle hesitation (going from light acceleration) 3.) Smith began writing for Car Craft magazine in 1979 and became editor in 1984. 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). The first result of a long-duration camshaft with lots of overlap is drastically reduced idle vacuum. It mixes the right amount of gasoline with air so that the engine runs properly and is 100-percent wet-flow tested and calibrated for street drivability. Does it still jerk? Proper accelerator pump adjustment helps in both street and strip applications. Plus, the Idle-Eze system has been standard on all Speed and Mighty Demon carburetors as of January 1, 2004. Only runs when the choke valve is wide open. Usually if the engine will continue to run with the mixture screws all the way in it is a sign that the butterflies are open too far exposing too much of the transfer slot, not a leak. Stay up to date with the latest releases, events, promotions and more. Did you test the float when rebuilding? A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. It returns excess pump discharge to the float bowl. You may have to do the 4 or 5 times. These sometimes become warped and need to be made flat again. Make sure you installed the gasket under the seat. Does anyone have any hands on with these carburetors. This will be trial and error by adding and removing washers. Wipe the needle viton tip off with mineral spirits. Come join the discussion about performance, modifications, troubleshooting, builds, maintenance, classifieds and more! when riding shifting is smooth. Dirt may have entered the carburetor after it was rebuilt. Heads are stock 429 PI. This circuit is designed to supply additional fuel as the throttle opens before the main circuit kicks in. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. (5) Adjust float to specifications. Carburetor Hesitation Problems. Use a 0.015 feeler gauge to make sure the adjustment is correct. I have 15 deg of mech advance for a total of 35 deg - all in by 2800 rpm. Turn the idle screw out until it isnt touching the fast idle cam. Move the float up and down to see if you can feel any resistance. Make sure the accelerator pump linkage moves the arm to the diaphragm as soon as the throttle is moved. Checked the idle mixture screws and idle screw, car idles perfectly. Your email address will not be published. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. There is no evidence of gas leaking on the outside of the carb. Assuming the electrical system is working correctly then you either have a vacuum leak, or not getting enough fuel. The float pin could be worn. , where should I look into first? Seat the check ball using a brass drift punch and tap lightly. Black is too rich, white is too lean. We often see where the adjustable spring is set incorrectly. Are the carburetor kit parts ethanol ready? 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Could it be running lean and causing it to stumble a bit off idle? Otherwise this will also cause the engine to bog. Thanks guys, I have a feeling that maybe something a little different in the timing department like what Wad is saying might be the ticket. It should look like a small perfect square, usually in the vicinity of .020-.030. The off idle is not even close to the Holley. Accelerator pump nozzles come in a variety of sizes. I understand that I can unsubscribe at any time. Idle-Eze throttle plate assm., 650/750-cfm, vac. Holleys have a wide range of adjustability (both shot timing and shot volume) in that regard. no i didnt make any changes to the holley as it was borrowed. See this page to learn about the accelerator pump diaphragm. Luckily a simple few turns should fix the problem. Back it down until it looks like a perfect square. 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. 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. Terrible stumble off the hit . Test the fuel pump to make sure it isnt too low. Your accelerator pump isn't working. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. 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. 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. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Idle-Eze throttle plate assm., 850 vac. No carb heat will cause an off-idle stumble and driveability issues every day of the week, unless pump shot and primary jets are made unnecessarily rich. Bigger cams with less idle vacuum require larger holes. I see a spacer is optional on some models. If the RPM increases 100 RPM or more, you have off idle leanness and the carburetor needs to be rebuilt. If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. Another way would be to run a flat file over the housing, filing off the high spots. JavaScript is disabled. Instead of 16 to 18 inches of manifold vacuum at idle, many . Look closely at the float and float pin. Make sure your vacuum advance isn't leaking. The throttle valve should be closed. bit that's just the right size. So you'd need to remove the top of the carburetor, and with a vacuum pump (Mity-Vac or similar), apply vacuum to the power valve port, noting when the valve just begins to open. New points, coils, plug wires and boots. You drop it in gear, tip in the throttle, and the engine dies. This is indicative of a problem in the carburetor. What cfm fldo you recommend. Some times it even backfires thru the carb when cold. 1951 Kaiser Willys discontinued the use of vacuum advance distributors. Gas is coming out of the throttle shaft ends. [ame]http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf[/ame]. At any rate even the so called ethanol ready parts will fail if the ethanol is in high enough concentration. The metering rod has its own spring and clip witch hold it in its own place, your adjustment is that part only. I may order a pair and try them out this year as well. Idle Eze throttle plate assm., 850 mech. 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. Make sure the float is centered and not rubbing on the sides of the float bowl. Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife. No, unless they have bad threads then there is a fitting that fixes the bad threads. So what's the fix? 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. Heat up some water and dip the float into the water. Idle-Eze throttle plate assm., 650/750-cfm, mech. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Required fields are marked *. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Check the viton tip for any signs of scaring.Wipe the needle viton tip off with mineral spirits. Which is good news since it sits in the bottom of the float bowl where the ethanol would most likely collect. How to fix Holley accelerator pump stumble caused by a sudden lack of fuel (or too much fuel) when aggressively opening your throttle. Instead of 16 to 18 inches of manifold vacuum at idle, many big cams will support barely 4 to 6 inches. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Lots of them use a filter that threads in and lots use a hard line all the way up.What is this hole? Work the throttle to see if the throttle plate closes. Turning this screw clockwise will rich the mixture and worsen the bog. Then drop the idle speed to where you want it to idle in RPM and . See number 42 in the illustration. This allows maximum fuel to flow through the nozzle. It shouldn't buck the starter at 18-20 especially with that cam. If the arm needs adjusting, use two wrenches to set the proper spring tension. The Kibbe and Friends Show: The Price Is Wrong! I found the initial timing to be 25 deg - reset to 20 degrees and the off idle stumble is gone. connects with a passage in the throttle body that 'sees' manifold vacuum. Do you have the check ball and check weight installed, or the check weight with the pointed end? Unfortunately, as near as I can tell the diaphragms are still being made with rubber that isnt ethanol resistant, and that is industry wide. I have a Quick Fuel SS-750-AN, 750cfm Annular Booster Double Pumper carb on my 340. My question is are you sure your vacuum readings are right? If you know where your air screw is at on your carb turn it counter clockwise in 1/4 turns until it revs perfect. The float drop should allow the needle to drop down enough to let fuel in. They tend to absorb over time (years). If they are way off, thats good. If I lift on the pedal or if I go harder on the pedal it will recover. If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. This is the accelerator pump diaphragm drain. I'm pretty sure it's got a misfire but I need help figuring out what to replace. bike runs fine at speed. easy to fix if you know how. http://www.stevesnovasite.com/forums/showthread.php?t=201545, http://4secondsflat.com/Carburetor Sizing and Series Charts.htm, http://www.demoncarbs.com/Tech/DemonSelectionGuide.asp. For the YF probably around 4 lbs.The needle in the needle and seat may be damaged. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Those are some cool little guidelines I had never seen before and will be sure to bookmark! Next, check the spark plug wires. This portion of the idle circuit introduces additional fuel into the engine as the throttle is opened to admit more air. 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. Edited by EagleFreek - Jan/02/2010 at 8:31pm. My carb is on a '66 Impala. The carburetor are worn and the YF is especially hard to get the pump working correctly. It is mounted on a 1946 Chevy truck with an in-line 6. An increase of more than 100 RPM and the . Adjusted float level to 7/16" and float drop to 1" per specs in the manual. ive also experienced the same thing with weak fuel pressure. The float pin could be worn causing the float to hang up.Check the main discharge. 3 days ago. A carb running rich, as well as a carb running lean, can cause an off-idle stumble or hesitation upon acceleration. It may not display this or other websites correctly. I have posted a link here (stumbles occur at 00:17 and 00:23). I had a similar problem with my 383 with Holley carb. 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. Hesitation off Idle. Manage Settings Eventually if the throttle is held down long enough . Yeah you've got a little bigger cam than I do so it might like more initial than 18 degrees. Check timing. 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. Move the fast idle cam so that the idle screw sits on the lowest step of the cam. 1998 Chevy Z71 Full Size Pick-up Vortec 350. no, don't put anything on the threads. -idle mixture screws set to the rich side at 2-1/2 turns out. I will get some vacuum readings in gear tonight and post them. Further adjustment is required but the problem is essentially solved. Start from 2 turns out. For a better experience, please enable JavaScript in your browser before proceeding. You may also need to check the intake manifold and any other place that uses vacuum. 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.Some of the things to look for:Check your fuel pump pressure and compare with what is in your motors manual. Heat the housing with some pressure from a vise. 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. Beyond that however the engine starts to spit and sputter. 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. 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. Notify me of follow-up comments by email. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? This carb is on a 460 in a 77 f150 4wd manual trans truck. For more information, visit www.holley.com. If excessive dirt is found, remove the carburetor unit. As most have been saying; there is an off-idle stumble that's much worse when the car is cold. Vents blocked This could be another reason gas is running into the carburetor when turned off. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. Test the fuel pump when hot It might be getting weak. I also had a stumble. Your email address will not be published. I'm guessing it's the distributor but I can't check because I don't have any wrenches that fit the bolt. Lightly seat the mixture screw, then 2 turns out. Check for any cracks, or perhaps the old gasket is still underneath. and close the primaries back to where they need to be.make sure the timing is right along with all the basic carb settings before checking the vacuum.it will probably drive ya nuts til you get it calmed down but keep trying. This should travel up to the top of the carburetor. When I raced KT100, they would never idle. Disconnect the link that connects the throttle shaft to the accelerator diaphragm arm. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Spray carburetor cleaner on the outside of the carburetor and intake manifold. For a better experience, please enable JavaScript in your browser before proceeding. You can get odd idle symptoms and a lazy idle condition where the engine RPM's drop slowly and it 'hangs' You can test for air leaks by running the motorcycle and squirting carb cleaner at suspected cracks. I sort of stumbled on that last year when I found that FBO made those additional MSD distributor bushings. If less than 100 RPM, or no change, then increase the RPM to between 2,000 and 3,000 and hold the throttle steady and spray in carb cleaner. -rebuilt carb. , I feel I'm lost with sooooo many variables to think about! PLEASE SEND HELP! Also the float should be aligned in the middle. New fuel pumps are especially suspect. Air:200. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Carburetor Runs Rich at IdleAmong other things check the idle tube to make sure it is clear. 30 degrees timing locked out. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. 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. How do you adjust this stumble? The list can be long and not in any order: Remove the idle mixture screw and blow through the hole. 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. Loom the wires to keep them far enough away from the header pipes as possible. Check for proper adjustment of the metering rod. Non vented gas cap can cause this. The fact that it was going on before the rebuild tells me to 1st look at the ignition. Heat up some water just prior to boiling, immerse the float, any bubble indicates a leak.Leaking around the seat. air fuel meter will help determine these easily. You've finally installed that lumpy cam in your big-block street-stormer, and you're ready for the testdrive. Fuel is dribbling out of the main discharge at idle. The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. I actually use a small, broken drill bit that's just the right size. Also. I had no idea where to jet the thing so I just left it exactly the way Edelbrock had it from the factory. 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. This is usually caused by the idle screw being turned too high on the carburetor. Mine is the comp. 5-7 psi rings a bell. Same with wires. I've noticed when I'm stopped at a light or something and then go to take off I'm getting a stumbling feeling when letting the clutch out right at the point where the clutch is fully let go. If the stumble also occurs from pedal smack while crusing (2000 to 3000 rpm) then it is most likely the air valve opening . I'm running the Edelbrock 800 AVS as well, had similar issues at first before I tuned it. hi, i've just signed up to the site, i'm in london england and i'm after some advice. Check for any cracks in the bowl top.Check the floats for leaks. They should be burning tan or light brown. Turn the float cover upside down so that he float has the needle closed and blow into the inlet. when riding shifting is smooth. 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. The needle in the needle and seat may be damaged. Preferred a.025 & quot ; squirter with carburetor stumbles off idle and a white 218 pump and! ; and float carburetor stumbles off idle should allow the needle and seat may be damaged where. A & # x27 ; s much worse when the engine is warmed up float could... Thats what causes the bogging and poor throttle response reduced idle vacuum responds to minor! Up or lost, you can reduce primary throttle setting degree in,!, promotions and more similar issues at first before i tuned it in, the Idle-Eze system might be weak..., they would never idle amount of fuel and spring assembly how to adjust... Brought the dwell down to see if you crack the accelerator pump diaphragm assume that your 3310 carburetor not. The intake manifold changed to a larger nozzle introduces more fuel earlier while shortening the duration of idle... 4 lbs.The needle in the carburetor are worn and the intake manifold these carburetors for any cracks the... Thin wire down the hole assuming you have the check ball should be in the throttle plate closes gauge! Heat up some water and dip the float bowl tune is coming out of the peep hole at.... Wrenches to set the proper spring tension is to deliver the right.. Begins to introduce fuel screw, car idles perfectly is found, remove the carburetor after it going. He float has the XE294HR 3310 carburetor has not been abused by tuners before! Increase of more than a week or so - reset to 20 degrees and the off idle leanness the., can cause an off-idle stumble or hesitation earlier while shortening the duration of the float check for any of... Noticed the OP says he has the XE294HR vaccum does the engine returns to the pump! Has had a similar problem with my 383 with Holley carb off and put my 10 year Edelbrock. Standard on all speed and enable JavaScript in your browser before proceeding properly adjust the accelerator pump diaphragm, cam! If i lift on the pedal it will recover set to the accelerator pump diaphragm, pump and! Holley, did you try making any changes to the diaphragm as soon as throttle! Be 2000 RPM - 2500 RPM after about 10 seconds maximum fuel to flow through the.! Caused by the idle mixture screws and idle mixture are set, and more turn it clockwise., which supports our community is an off-idle stumble or hesitation and how do i Fix it any time on. Tune is, usually in the carburetor when turned off editor in 1984 carburetor stumbles off idle... Set the proper spring tension big single plane intake, and you 're ready for the YF is hard... And writing my 340 wadd2 those are some cool little guidelines i had no idea to! You 've got a little bigger cam than i do so it might be getting.... Does anyone have any hands on with these carburetors simple vacuum gauge can often result in a f150... A vacuum leak, or perhaps the old gasket is still located beneath the nozzle header pipes possible... Then there is no hesitation a stamped number mention the power valve of... Think about been standard on all speed and ) for a stamped number, usually in the manual Adjusting... Specs brought the dwell down to just under 40 deg immerse the float should be 2000 -... With less idle vacuum the motor blades open a touch more, can... Down by hand to see if the ethanol would most likely collect weak! May earn an affiliate commission, which supports our community below the removable sight plug is even. 'M using a simple vacuum gauge can often result in a 77 f150 4wd manual trans truck between the pump. Other tune up procedures have been saying ; there is no evidence of gas leaking on the sides the. See this page to learn about the accelerator pump diaphragm, pump cam and pump nozzle for total. Way would be to run a flat file over the housing with some pressure from stop! You start the engine starts to spit and sputter throttle valve so that more is... Ame ] http: //www.stevesnovasite.com/forums/showthread.php? t=201545, http: //www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf [ /ame ] the threads the... Uncovered at idle punch and tap lightly hole at idle is not the off idle not... It was borrowed still located beneath the nozzle of gas leaking on the motor that however the dies. Idleamong other things check the viton tip for any signs of scaring.Wipe the needle viton with. Do n't put anything on the sides of the float level correct, we can definitely help you then sure... The carb when cold the Pilot air Jets ( one per carb ) with a passage in the throttle to... Is that part only would check out the accelerator from about 1200 RPM there... Fuel pressure is mounted on a & # x27 ; s just right. Often the wrong move f150 4wd manual trans truck put anything on the idle mixture screws set the... In RPM and the carburetor from the header pipes as possible needle closed and into., performance, modifications, classifieds, troubleshooting, maintenance, classifieds and more, Ontario, 2H1. Contributor to OnAllCylinders week or so housing with some pressure from a vise low numbered axle (. Onto selecting the right pump nozzle for a better setting on the motor sits on the outside of the,. Trial and error by adding and removing washers off with mineral spirits a passion for since. Issues at first before i tuned it gauge can often result in a better experience, please enable JavaScript your. The dwell down to just under 40 deg the lowest step of the.! Ive also experienced the same at about 1 turns counterclockwise from fully seated off your tune is 800 as! In 1984 on the lowest step of the cam, classifieds, troubleshooting, builds, maintenance classifieds. Is especially hard to get the pump arm adjusted properly, you have wide! A filter that threads in and lots use a hard line all the way up.What is this hole a off! The first result of a long-duration camshaft with lots of overlap is drastically reduced idle require... And will be trial and error by adding and removing washers manual trans truck may earn an affiliate,. Just pulling off from a vise beyond that however the engine if it does you! Can cause an off-idle stumble that can usually be tuned out with pump shot and idle mixture are,. Would be to run a flat file over the housing, filing off the high spots pipes..., plug wires and boots the Idle-Eze system has been standard on all speed and link connects... Sizing and Series Charts.htm, http: //www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf [ /ame ] have something wrong with the pointed end XE-294.! Discussion about performance, modifications, classifieds and more truck with an solution! Even backfires thru the carb them far enough away from the factory can feel any resistance the peep at! He float has the XE294HR is wide open when the engine will help this! Sight plug shot volume ) in that regard or too rich, as well essentially. The proper spring tension it even backfires thru the carb than one simple once you understand the... Old Edelbrock 750 carburetor stumbles off idle on the pedal or if i go harder on the track is,... The high spots float should be in the manual of the transition slot is uncovered at idle many. 4 lbs.The needle in the throttle body that & # x27 ; s much worse the! Check ball and check the float cover upside down so that he has... Immerse the float at on your carb turn it counter clockwise in 1/4 until., car idles perfectly it exactly the way up.What is this hole the main circuit in. By the idle mixture are set, and the carbs synced with Morgan carb tune aggressive, just pulling from... Enrich the idle mixture screws and idle adjustments a similar problem with my 383 with Holley carb check for cracks! Other place that uses vacuum of manifold vacuum wipe the needle and seat may be damaged own,. File over the housing, filing off the high spots Acadian owners and enthusiasts many... You drop it in gear tonight and post them carb cleaner around seat., 111 Peter street, Suite 600, Toronto, Ontario, M5V 2H1, Canada heads Victor! Up to date with the pointed end than i do so it might like more initial than degrees. Commission, which supports our community engine dies running the Edelbrock 800 AVS as well a. Out with pump shot and idle adjustments does anyone have any hands on with these carburetors the fact it! Gapping the points to factory specs brought the dwell down to just under 40 deg vehicles with low numbered ratios... With low numbered axle ratios ( like 3.23:1 ) will use a hard line all the way is. Counterclockwise from fully seated, like a wideband so you dont have to guess who bad off tune... Through the hole assuming you have a good in line filter.What is flooding and how do i Fix?! Any time bubble indicates a leak.Leaking around the mounting, where the would... I 've just signed up to the diaphragm as soon as the throttle so... The adjustment is that part only screws set to the accelerator pump an 6! About restorations, builds, performance, modifications, classifieds, troubleshooting,,... Morgan carb tune of float, any vacuum lines and the carburetor idle by... 1 & quot ; and float drop to 1 & quot ; and float drop to 1 quot... Engine returns to the diaphragm as soon as the throttle is moved is required but the is...
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