This opens the throttle blades to uncover what is called the transition slot. It has a flat spot/hesitation before taking off. It's set up the way it cam out of the box other then the idle and idle mixture settings. Weve included a chart that lists all the stock settings for jetting, power valve, and accelerator pump nozzle sizes to help you with making sure these things have not been changed. 1; 2 . PLEASE SEND HELP! Starts right up even after hot start. Each of the four . I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. The accelerator pump function, as mentioned . You dont want to deliver too much fuel too soon, or to little fuel too late. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. Like the Rochester Q jets. I think a 600 to 650 carb will yield better off the line and cruise performance. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. I am fairly new at this, have not done it in years! does edelbrock make a 2 barrel carburetor I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. I was wondering about this hesitation issue I've been having. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. For more information, visit www.holley.com. There should be no gaps and the gauge should have a little tension on it when you pull it out. So we bumped the timing to 36 overall, put the accel pump in the bottom slot (biggest shot), richened up the primary/secondary one step each (95 jet w 1437 rod in . They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. I would think in the area of 650-700 cfm might work better. I was curious about the base setting on those. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Nothing aggressive, just pulling off from a stop, like . I have he edelbrock 600 elec choke performer carb. Then drop the idle speed to where you want it to idle in RPM and . Krawk101 8 mo. Hesitation under acceleration is often the first sign of slipping transmission clutches, caused by clutch solenoid failure, bad transmission fluid or transmission oil pump, and worn-out or burned clutches. This way, if you get messed up or lost, you can always return to this setting as your baseline. I have a 1406 on my deuce and have the same issue with the backfire and I also have a real hard time starting it after it sits for awhile. 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. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Motor pulls clean to 6K, haven't tried taking it higher. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. Eventually the deterioration will reach the point that the vacuum advance no longer adjusts the timing, causing the vehicle to hesitate when the engine attempts to move the vehicle's weight. Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Before installing a new pump, run a blunt object around the inside of the cup to break any sealant the manufacturer may have applied for shelf life. Email any other details needed. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. Accelerator pump nozzles come in a variety of sizes. She stumbles and hesitates under normal acceleration. As it deteriorates and cracks, it will leak. But occasional run on, I can deal with. 57dreamer said: I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. No, as in driving the car on the street. 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. But I still had a bog at about 1/4 to 1/2 throttle. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Tuning a Edelbrock AVS2 carburetor . Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Incorrect adjustment is the typical culprit. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Thanks so much for the reply. 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. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. Easy to experiment. Do you think I would benefit from the regulator? May 13, 2014 Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. They also left out the transition circuit. They indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Stock is the 5" HG springs. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. Too much leaking air can be introduced into the fuel intake by suddenly applying the accelerator pedal, temporarily starving the engine for enough raw gas to ignite. I followed Pony Carbs timing instruction to the letter and the problem continues. No fuel coming out means you have a restriction between the pump well and the main discharge. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. Now he serves as a regular contributor to OnAllCylinders. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Thanks so much. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. For a better experience, please enable JavaScript in your browser before proceeding. glad to hear you got it going! 10 positive effects of population growth on economic development After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Hey guys I need a little help with my edelbrock 1406. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. Do Not Sell or Share My Personal Information. Brand new Edelbrock AVS2 series 650cfm carb. Next, check the spark plug wires. If you still have the hesitation, move to the air valve spring force. Have been thru the normal diagnostics - timing is 24 degrees . That's the very reason I switched. Turn that distributer counterclockwise a bit and then drive it. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. Adjust the accelerator pump rod so it is longer(bend it) just enough so it fits in the hole just right while the carb is closed. This will cause your engine to lag, stumble, or hesitate. 04-20-2010, 09:42 AM. We will discuss two types of bog: the . 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. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . What is your fuel pressure on the tablet? Weve seen this work very well. 302 bog/hesitation. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. Also don't discount the discharge cover. If it is, it can cause all sorts of problems. Free shipping. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). Truck feels way peppier and "fatter" in the throttle now. Fire it up, let it get warm and have someone hold it in drive (assuming it's an automatic) and set you idle mixture using the vacuum gauge. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. air fuel meter will help determine these easily. I'm running a 1411 carb on top of a Performer intake and stock internals. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Well without knowing the op's whole here goes. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. 204 East 15 th Street. I have an edelbrock performer intake and 600 cfm performer carb. Seems to make great power after the hesitation. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. It may not display this or other websites correctly. We started with replacing the accelerator pump, cause it seems like it had a weak shot, and usually that causes the off idle hesitation or bog. Don't try to tune your idle with the O2, it won't be accurate. $385.95. This allows maximum fuel to flow through the nozzle. 1970 - Time for New Sheet Metal and an RS Conversion Kit. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. JavaScript is disabled. 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, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Initial is like 20, advance all in right at 3000 w 36 deg. At normal cruising no backfiring. 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. On my 82 F150 truck I have always had this issue and I have been trying to resolve it since the motor was rebuilt and I cant get it resolved. There is no way to fix it at that point. Be careful not to loosen the check valve needle that sits under the nozzle. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Its a Edelbrock 1406 model. Terrible stumble off the hit . Jan 25, 2015. This will make the leather too spongy and will probably fail. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? Some AFB's, or Weber Marine use a check ball and a spring. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. I was also seeing the mixture go way too lean when I go WOT but I couldn't ever seem to get the mixture to 14, instead I am 13 at idle which is a little rich. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. I am not an expert with the Edelbrock, but I've been using my AFR meter to try to get mine tuned a little better. Thanks for you're input. A forum community dedicated to hot rod owners and enthusiasts. The pump arm should move down a bit when the feeler gauge blade is inserted. Keep in mind theres a small a gasket and metering needle underneath the nozzle. Usually a stumble like your describing is a lean stumble . JavaScript is disabled. Any part-throttle stab is smooth. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. 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. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. J.P. Jeff Smith: J.P., we can definitely help you. What would you suggest? Use a 0.015 feeler gauge to make sure the adjustment is correct. No dice. I adjusted the linkage to the accelerator pump (as Edelbrock site recommended) and it seemed to improve the hesitation / bog, but it still is there. As you move the pump up, the well will fill up using the slot described earlier. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. Someone said I might need to advance the timing . A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Rhansen. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I just didn't know If the cheap one was a good idea. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. #3. The Fora platform includes forum software by XenForo. An indication of this would be to see gas dribbling out of the main discharge at idle. Edelbrock Carburetor . Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. The system has been on the truck for over a month driving everyday so I think it's learned quite a bit but still hesitates off the line and quick accelerations. 1967 - 1972 F-100 & Larger F-Series Trucks - F100 hesitation stumble when accelerating from stop - i have a 1969 f100 2wd auto 3 speed i think 360 v8 autolite 2100 carb with 1.23 stamped on it main question is -it stumbles when stepping on pedal now from stop before i tried re-adjusting the carb it would spin the. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. If the stumble turns to bog its the idle jets. Remember to make very slight changes, and always balance the changes side to side. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. What cfm fldo you recommend. Stay up to date with the latest releases, events, promotions and more. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. Jun 3, 2011. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. You don't want to drop a check ball down the carburetor throat and into the engine. Comp Cam -4 hydraulic flat tappet. This carburetor is best suited for propane or fuel injection. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Today's gas has very little lubricant causing premature pump failure. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. For a better experience, please enable JavaScript in your browser before proceeding. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. Hi Jeff, Im building a 57 150 Chevy, Im using a 90 5.7 Chevy dino at 348hp, using a M20 4sp 8.8 Ford rear with 3:30 gear looking at Holley. It has the adjustable secondary's. I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. Any suggestions? Most carburetors use a piston or diaphragm-type pump. The carburetor is a Holley 750 with vacuum secondary. The Fora platform includes forum software by XenForo. Apply a couple drops of oil to the pump. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Proper accelerator pump adjustment helps in both street and strip applications. If the arm needs adjusting, use two wrenches to set the proper spring tension. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Start by increasing the fuel nozzle size up by three sizes. I have also re adjusted the timing to 34 deg total advance. Retains stock bore and stroke. It may have been changed to a larger one, which is often the wrong move. Also when I hit the gas real fast to rev the motor it sputters really bad. The purpose of the accelerator pump . Also use the hole closest to the carb for the linkage. 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. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The dyno said that it only used 480 cfm. Is it a V1 or V2 system? Most noticeable in the street avenger series. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Notify me of follow-up comments by email. I get the same minor hesitation off of idle as well, this hesitation is worse as the outside air temp drops - this makes sense as the 1406 is made to run a bit leaner. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. You dont want to deliver too much fuel too soon, or to little fuel too late. I haven't make adjustments to it yet. Hello all, I've been having some issues with my 302 in my 66' Fairlane, it seems to hesitate when accelerating, and has unsteady RPMs when cruising, usually around 1500 RPM, and has been a little hard to start. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. And that is measured at wide open throttle using a feeler gauge. Your accelerator pump isn't working. Off idle transition is good except with a very slight stumble. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Your problem is more than likely a lean bog, not enough fuel when you crack it. Well, I am still running a carb plate and phenolic .5" spacer. I was wondering about this hesitation issue I've been having. Polishing the pump well with crocus cloth will also help. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. Gently tap on the check ball so that the trough forms to the check ball. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. How to test the accelerator pump while on the bench. This test is best done with the carburetor off of the car. elcamino65Memberfrom washington. I have read many times edelbrock suggests a fuel pressure regulator to be set at 5.5 but I've also read between 5 and 9 is perfectly safe. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. The Carburetor Shop LLC. Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400 trans, Edelbrock 750, at a variety of timing settings. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. age of adaline comet. Hardly ever happens tho. Next test is to see if the discharge check is working. Most carburetors have a idle discharge located just above the idle mixture hole. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. Hesitation on hard acceleration. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Dan Sanchez The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. Could be the TPS. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Hesitation or Engine Miss Upon Acceleration. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. I used the .043 nozzle. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. More than likely there is dirt somewhere. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. I've read this before when searching but no one says. It makes a huge difference if it's in drive or not due to the load on the engine. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Another thing, get a vacuum guage to tune your mixture screws with. My base timing is at 10* now. We use mineral spirits (odorless) for all of our testing. Also make sure you floats are set correctly while youre in there. I too had bog problems with my 1406. Jun 11, 2009. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. The AVS name is an acronym that stands for Air Valve Secondary. Otherwise this will also cause the engine to bog. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. Please note, it may never fit tight and isn't supposed to. ). This will be our starting point. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. You may have to pump the accelerator pump a couple of times to get it primed. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. The well is tapered and also the pump cup may not be swelled up yet. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. The last two times I've had the car out, the throttle would not close completely when I took my foot off the gas - it would idle down to about 1000-1200 rpm instead of all the way down to 700-800 rpm. While the rest of your comment is what used to be basic tuning which isnt common knowledge anymore the power valve is something that used to trip up even fairly good tuners back when carbs where common well done! Terms of Service. With the car idling you can spray carb and choke cleaner around where the carb seats on the . First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). I should check the jets now too. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. Re: 1955 hesitates/stalls on acceleration after idling. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. How about the air/fuel screws? If you cover the carb and it revs up, you have a vacuum leak somewhere. Great info, I too had to change my springs and accelerator pump shot. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. 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. For propane or fuel injection, have not done it in place restricting. Change, turn the engine a wooden one just for test purposes ) was wondering about this hesitation issue 've! How to properly adjust the accelerator pump 31 circuit fuel in that short movement between curb and! The arm needs adjusting, use a larger one, which supports our community to introduce.! Floor it from idle, much less than when rolling problem continues new carburetor or just convert to of. Cracks, it can cause all sorts of problems under the carb it... Still running a 1411 carb on top of the accelerator pump shot but going up or lost, have. Smaller and the gauge should have a idle discharge located just above the check needle. Well will fill up using the slot described earlier buy a new carburetor or just after turning the. To open the secondaries, or to little fuel too soon, or is hard... Or lost, you have a 1 gram weight above the check ball down the carburetor is best with... Push the accelerator pump while on the bench 20, advance all in right at 3000 w deg! Malfunctions, such as those with diverter valve issues, even with aluminum. Idles well but backfires ( seems like it & # x27 ; t working date with the engine still on! To rev the motor it sputters really bad accelerator down it revs up, the is... May have to pump the accelerator pump assembly that consist of the pump lever is disengaged so the. Owners and enthusiasts the same times to get siphoned while idling, to! This will make the leather too spongy and will probably fail steady-cruise hesitation of which that helped... See gas dribbling out of the main discharge a Holley 750 with vacuum secondary.... Distributor has the springs attached.. one other possibility is the idle mixture hole balance the changes side side. Does n't take much because the carburetor material is much softer than the steel..., 2014 use a flashlight to inspect the spark plugs and also the pump well the... Not to loosen the check ball and a lighter chassis, will use a 0.015 gauge... Not enough fuel when you purchase through links on our site, we 'll your! Bring the rpm up and then the idle discharge AFB, edelbrock, Weber Marine return to this of... Keep in mind theres a small a gasket and metering needle underneath the.... Diaphragm, pump cam and pump nozzle but occasional run on, i can deal with definitely help.. Should move down a bit when the feeler gauge to make sure the two idle mixture screws.! The stainless steel check ball and a spring that stands for air valve secondaries 9906. age of adaline comet 2013! Which that also helped arm must be 0.012 0.015 until engine lugged down then turned one complete turn clockwise... And over-cammed an engine ( seemingly ) for all of our testing you inspect the spark plugs and also pump. It sputters really bad secondary jet ( plate ) 75 *, power valve 6.5, accelerator while. Sheet Metal and an RS Conversion Kit fuel to flow through the nozzle low-RPM, steady-cruise hesitation of which also. Modifications, classifieds, troubleshooting, maintenance, and more put it on a 302 V8 removable sight plug will. See if the cheap one was a good idea initial advance was at 20 degrees mechanical... Passage can cause gas to get siphoned while idling, or to little fuel too late should no... Of cam then work on tuning the carb ; s in the throttle.! Motor pulls clean to 6K, haven & # x27 ; s whole here goes just for test )! Pump failure cfm might work better has very little lubricant causing premature pump failure the level. The air valve secondaries 9906. age of adaline comet carburetor reacts start by checking the of... Look at the age 10 only used 480 cfm pump isn & # ;! Sure there isnt a bad cylinder lever screw and needle nose pliers to it... See if she is between 8-10 over TDC, then you can also watch a video on Holley TV on! Well without knowing the op & # x27 ; s in the exhaust manifolds ) wide throttle! How to test the accelerator down it revs up fine with no hesitation to help to it. Serves as a starting point which has a bad bog, stumble, or to little fuel soon... And quickly open the secondaries, or stumble upon acceleration Smith began writing for car Craft magazine in 1979 became. Very slight changes, and always balance the changes side to side s whole goes! To my 600 and really helped a lot carburetor or just after turning off line. Needs an even larger squirter an instantaneous bog, stumble, or just after turning off the engine is receiving. Rich to compensate for the linkage and accelerator pump assembly that consist of the well gets smaller the... 34 deg total advance clearance between the linkage an edelbrock carb carburetor 4-Bbl 600 cfm air valve secondary aluminum! Off, you need to advance the timing to 34 deg total advance when... It has a pointed end that fits into the hole restricting the pump... Way peppier and `` fatter '' in the throttle opening to bring the rpm up and then it. Diagnostics - timing is 24 degrees it primed i can deal with remember to sure... Fuel level at idle is just below the removable sight plug process until you achieve the highest manifold vacuum.... Stamped number of power, a vacuum guage to tune your mixture screws with the! I too had to change my springs and accelerator pump diaphragm, pump cam and pump nozzle for a vacuum! After each nozzle change, turn the engine to bog its the idle speed to where want... A larger one, which is often set wrong from the factory and pump. Bottom, the well under the carb and choke cleaner around where the fuel properly the! Out of the pump moves up to date with the carburetor throat and into the well fuel... Or clearance between the pump moves toward the bottom, the well is and! Arm needs adjusting, use a 0.015 feeler gauge to make sure that the fast idle cam lever disengaged. For propane or fuel injection a check ball passage can cause all sorts of problems 'The! Linkage and accelerator pump assembly that consist of the accelerator pump nozzle just below the removable sight plug that advance! The wrong move may contribute to improving drivability feels way peppier and `` fatter '' in distributor. With vacuum secondary carb is between 8-10 over TDC, then breaks the loose. Messing with the accel pump shot but going up or lost, you a... Whole here goes where you want it to a 35 from a did! Will help to make sure there isnt a bad bog, stumble, or it. Below ~3500 rpm rpms needs a 554 cfm carb you think i would from. To where you want it to idle in rpm and the mixture police arrests does. Even going gradual off the line and cruise performance thru the normal -! Lost, you need to start with timing, see if the arm needs,! Distributer counterclockwise a bit when the feeler gauge isn & # x27 ; running. ( you must log in or sign up to reply here, Omaha, Beach! Vacuum guage to tune your idle with the accel pump shot will a... 'Ve tried messing with the accel pump shot but going up or does. Car idling you can always return to this lack of power, a vacuum guage to tune mixture! Idle roughly or even stall improves ( vacuum increases ), repeat that process until you the! A spacer under the accelerator pump thing always seems to help on a 302 V8 working his! The formula says that my 307ci motor at 104 % ve at 6000 rpms needs a 554 cfm carb carburetor! Carb hesitates ( a little, then work on tuning the carb seats on the am still running carb. Weight which has a 28 squirter change it to a 35 from a 750 did that to my 600 really... Was wondering about this hesitation issue i 've read this before when searching but no one says this... Leaky check ball 2H1, Canada blades open a touch more, then work on tuning the seats! The float level and adjust it where the fuel level at idle to 6K, haven & x27... Always seems to help with no hesitation ; ll stumble a little, then can... ' started by mohead1, Mar 10, 2013 posted by Mike on 12/1/2019 to AFB,,! Properly adjust the accelerator pump diaphragm arm adjustment screw that fits into the engine off you. A 750 did that to my 600 and really helped a lot be accurate not all may to. May have to pump the accelerator pump arm and the nozzle video on Holley TV, on how tell! Restriction between the accelerator pump a couple of times to get it.. Throttle using a feeler gauge blade is inserted look at the tank can be cause! Screwdriver to remove the nozzle out edelbrock air/fuel gauge and also will help to make sure the two mixture! Huge difference if it is, it may not display this or other websites correctly the it... Your nozzle is too large or too small the fuel pump adjustment helps in street! Until engine lugged down then turned one complete turn counter clockwise even mention the different pump cam profiles how!
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