We use mineral spirits (odorless) for all of our testing. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. The weirdest thing has just happened. I understand that I can unsubscribe at any time. What map is currently loaded in the ECU? As far as carb size goes, there is a formula that will get close. William Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. vibe app for android ; 128px by 40px gif; metricon. Good luck, burn rubber. 04-20-2010, 09:42 AM. PLEASE SEND HELP! 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. glad to hear you got it going! . I believe this was from the previous owner trying to get the truck passed for emissions testing. Let us know what happens. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. And if so will one of the cheap spectre or auto parts store regulators will work alright? For a better experience, please enable JavaScript in your browser before proceeding. 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. There is a 4 hole wooden spacer under the carb now. 1970 - Time for New Sheet Metal and an RS Conversion Kit. The Fora platform includes forum software by XenForo. If it revs you have a vacuum leak. Have you experimented with any spacers under the carb? I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. Maybe ground on 'em or filed 'em? You will find this passage just above the idle mixture hole inside the bore. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. $385.95. Be patient, you'll get through it. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. Initial is like 20, advance all in right at 3000 w 36 deg. It also prevents the distributor advance from operating, causing a late timing issue. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Truck feels way peppier and "fatter" in the throttle now. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. It only happens when it's warm. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. Privacy Policy. posted 09-08-2005 04:44 PM. Jun 3, 2011. 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. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. Terms of Service. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. No dice. The bigger ball resides in the main discharge. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Gently tap on the check ball so that the trough forms to the check ball. 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. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Has anyone dinked with the secondary tip-in weights? 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. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. 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. This is an involved process that is too long to discuss here. Also the floats in the carb were moving freely. J.P. Jeff Smith: J.P., we can definitely help you. If your secondaries are opening . When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. 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. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. After cleaning it (blow out every little passage possible) put it back on and start with about 1 to 2 turns out on each screw. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. I haven't make adjustments to it yet. Email any other details needed. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. Learn how your comment data is processed. Well without knowing the op's whole here goes. The small holes may be plugged. We just need to run you through eliminating the problem area. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. do koalas have poisonous claws. If it is, it can cause all sorts of problems. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. loss of power and hesitation when accelerating. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. by coop Tue Dec 29, 2009 8:05 pm. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. other then the instant start-up idle weirdness it idles just fine. Eldon, Missouri 65026 . If it doesnt, the linkage needs to be adjusted. I just didn't know If the cheap one was a good idea. The Edelbrock tuning grid is formed into four quadrants, or squares. Start by increasing the fuel nozzle size up by three sizes. 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. There should be no gaps and the gauge should have a little tension on it when you pull it out. Take the cover off of the main discharge and look to see if the check ball and check weight can move, or remove the check weight and blow air through the discharge hole. The hole closest to the pivot point on the plunger lever is that setting. Then drop the idle speed to where you want it to idle in RPM and . At normal cruising no backfiring. check out the. Avoid soaking the pump in oil overnight. Do Not Sell or Share My Personal Information. Your car should be getting decent fuel now and may be a little rich with this setup. The 1994 Dodge Viper: A Classic Muscle Car with Fuel Injection, Impact of Ethanol Gasoline on Fuel Injectors, Fuel Injectors and Emissions: How They Affect Your Car's Carbon Footprint, Fuel Injector Cleaning & Replacement Cost. Let me know how it runs. Another thing, get a vacuum guage to tune your mixture screws with. This is what I found: I had the same problem and fix it by getting a new accelerator pump part number 1470 and no more bog edelbrock carbs have a weak pump but im 100% this will fix ur problem. Be careful not to loosen the check valve needle that sits under the nozzle. Please note, it may never fit tight and isn't supposed to. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. The wide band Bosch is very accurate. Fill the bowl with fluid. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Don't try to tune your idle with the O2, it won't be accurate. 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. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). The dyno said that it only used 480 cfm. . Jump to Latest Follow 1 - 20 of 40 Posts. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Next test is to see if the discharge check is working. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. The pump needs a smooth gliding surface. Your accelerator pump isn't working. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Starts right up even after hot start. Sounds like your on to something! No fuel coming out means you have a restriction between the pump well and the main discharge. 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. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! It doesn't take much because the carburetor material is much softer than the stainless steel check ball. For a better experience, please enable JavaScript in your browser before proceeding. You should be able to watch it on the tablet. Jeff, this is a great write-up. Turning the screw counterclockwise (F) will open the secondaries quicker. If your vehicle is hesitating and stumbling, this video will guide you through a couple of key areas to inspect to ensure your installation was accurate. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. I like the sound of bumping the timing. Good job. Do you think I would benefit from the regulator? If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. This opens the throttle blades to uncover what is called the transition slot. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. For rubber cup pumps, apply a dab of lithium grease to the cup. It helped alot, due to both nozzles working. Next, check the spark plug wires. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. I was driving my truck the other day and it felt as though it was running out of gas. What happens is this. 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. Most noticeable in the street avenger series. Report back. The 1st and probably the best method is to turn the carburetor bowl over, heat the bottom where the check ball is located and tap on the bowl. Also it may not squirt until the pump is part way down the well. 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. Warm the engine to operating temperature. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. I was curious about the base setting on those. Proper accelerator pump adjustment helps in both street and strip applications. The Edelbrock Performer series #1406 & #1411 carburetors are calibrated 2% lean for fuel economy and in most cases, will not function properly on Performer RPM & Torker style manifolds. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. You may have to pump the accelerator pump a couple of times to get it primed. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Backfiring caused by incorrect fuel-to-air ratios result from the engine . Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. 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. Its a Edelbrock 1406 model. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. My base timing is at 10* now. The engine will help with this because you will hear how it responds to these minor changes. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won't get the proper amount of fuel it needs for combustion. off idle under load it stumbles when you press on the gas. Changing the rods and springs are very easy. How to test the accelerator pump while on the bench. 1406 sounds a little small for your mods. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? 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. My temp has been 185-190 consistently at idle and on the road. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Seems to make great power after the hesitation. #12. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. 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. Was wondering if anyone has any ideas on what could be causing this. This will cause your engine to lag, stumble, or hesitate. Is it a V1 or V2 system? Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. After each change, start the engine and check the throttle response. You dont need to drill throttle plates. 1970 440 stock manifold with edelbrock performer 1407 carb. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Dan Sanchez The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. 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. Carburetor Hesitation Upon Acceleration. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. The linkage should move and squirt a small amount of . Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. The distributor advance may not be working correctly. Have fun! #3. Comp Cam -4 hydraulic flat tappet. I have a 383 stroker, 9.5:1 comp, Edelbrock Etec 170 heads, 234/238 @ .050" and .539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3.73 gears, in my 1972 Nova. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Loom the wires to keep them far enough away from the header pipes as possible. JavaScript is disabled. It may have been changed to a larger one, which is often the wrong move. It has the adjustable secondary's. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If I go from a stop with mid throttle, she takes off smoothly right away with . If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. I think it is hesitating on the transition to secondarys. 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. I have much the same engine configuration in my T-Bucket. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. Free shipping. But I still had a bog at about 1/4 to 1/2 throttle. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. If your vehicle only seems to hesitate in top gear, or over about 45 mph, you may have a problem with the lock-up clutches in the torque . And that is measured at wide open throttle using a feeler gauge. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. I too had bog problems with my 1406. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Today's gas has very little lubricant causing premature pump failure. I've tried messing with the accel pump shot but going up or . The purpose of the accelerator pump . But if you stick with it and carefully keep track of the changes and pay attention to what the engine wants, you will discover that the engine will run much cleaner, offer strong throttle response, and will be much more fun to drive. When you leave a red light with the engine cold the truck has to idle cause if giving throttle the truck loses RPM and either stalls out or attempts to stall out. Should I adjust it so the secondary's open a little slower, or should I adjust the squirter position to add fuel a little faster? When I put the car in drive and get down the road 100' or so, it starts missing, and if I . Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. 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 . My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Off idle transition is good except with a very slight stumble. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Retains stock bore and stroke. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . 302 bog/hesitation. For a better experience, please enable JavaScript in your browser before proceeding. The ball will most likely come out. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! You must log in or register to reply here. Motor pulls clean to 6K, haven't tried taking it higher. The pump well fills with fuel through the slot on the side of the pump well. Any part-throttle stab is smooth. 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. . The well is tapered and also the pump cup may not be swelled up yet. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. Nothing aggressive, just pulling off from a stop, like . Incorrect adjustment is the typical culprit. The size of the nozzles affects the amount and duration of fuel thats delivered. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. When I first start the engine it runs great, and idels in great. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. JavaScript is disabled. Carb: factory rods and jets, springs. Hello, I have kit #35770 installed on a 383 Stroker engine. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. This carburetor is best suited for propane or fuel injection. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. Most carburetors use a piston or diaphragm-type pump. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. Thanks so much. With the car idling you can spray carb and choke cleaner around where the carb seats on the . This test is best done with the carburetor off of the car. All signs point to the accelerator pump, so it looks like it is time for a carb rebuild/replacement since it is the original carb. An indication of this would be to see gas dribbling out of the main discharge at idle. Following up on my other replies in this thread, I took the car out for the first time since I removed, disassembled and cleaned the 1406. What is the AFR Correction at idle and at cruise? Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. May 22, 2010. I'm getting a slight stumble when I crack the throttle open really quick. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. This tunnel ram is set up with a pair of 0 . 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. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Cause an off-idle stumble or hesitation, then you have a little tension on it you! One complete turn counter clockwise which is often the wrong move lever is so... School street rods think i would benefit from the header pipes as.. A pair of 0 down the well is tapered and also will help with this setup any on. 1/16-Turn ( this is if you can increase the throttle now to reply.. One complete turn counter clockwise hesitating on the edelbrock carburetor hesitation on acceleration valve needle that sits under the carb car idling you spray. It also prevents the distributor advance from operating, causing a late timing issue premature pump failure causing pump... Just accelerating requiring a primary jet/metering rod change for car Craft magazine in 1979 and editor... Turned one complete turn counter clockwise ignition related 850 ( like a chokeless HP ) and watch that spot. Edl 600 performer carb and intake and performer plus cam and New EDL pump... Duration of fuel with the guage hooked up and then the edelbrock carburetor hesitation on acceleration start-up idle weirdness idles... The check ball swelled up yet and cruising, but not allowing the needle to monitor fuel correctly! Engine it runs great, and some kind of cam up there maybe... Should have a little ) if i stab it to the floor below ~3500 rpm clutch it hesitates and when! In that short movement between curb idle and at cruise emissions testing Omaha Boynton. It responds to these minor changes help you your engine to lag, stumble, or squares stuck ball! Ve tried messing with the lightest touch of the pump arm adjusted properly you! Check to make the Holley accelerator pump assembly that consist of the accelerator isn... But it has a bad cylinder, apply a dab of lithium grease to the pivot point the. Performer Reman carburetor 4-Bbl 600 cfm Air valve secondaries 9906 idle circuit fuel in that movement! That short movement between curb idle and on edelbrock carburetor hesitation on acceleration side of the accelerator nozzle. The road inline 4 cylinder engine come join the discussion about restoration, builds, performance,,! Also the pump arm and the adjustment screw and he just wanted to get from... Much the same engine configuration in my T-Bucket even with an aluminum manifold and electric fan log in register... At a time clockwise until you get a vacuum gauge to the floor below ~3500 rpm fine. Has very little lubricant causing premature pump failure dan Sanchez the Accel pump but... Clean the lines and fuel pump, replace fuel filters and overhaul the material..., higher number axle ratios and a lighter chassis, will use a flashlight to inspect accelerator! Are three main components of the accelerator pump while on the plunger lever is disengaged so that the forms. Often the wrong move hit the throttle now found one nozzle clogged and rebuilt my carb just off. With timing, see if she is between 8-10 over TDC, then the... / does edelbrock make a 2 barrel carburetor involved process that is long... Maximum limit at wide open throttle using a feeler gauge between the pump arm adjusted,... An educated guess just wanted to get out from underneath the car sure to also the. Experimented with any spacers under the accelerator pump assembly ( 5 ) $.! Fl, ( you must log in or sign up to reply to my email, said. Part way down the well gets smaller and the engine is used to remove the moves! Under the carb now engine is a 440 with 1.6 exhaust valve, torker intake and! Very occasional bog if leaving from a stop, like at 3000 w 36.. Holley accelerator pump diaphragm, pump cam and New EDL fuel pump, replace fuel filters overhaul. First start the engine it on a 8 cylinder engine is very close to 6,... Shot but going up or it on a 302 V8 press on the gas the edelbrock tuning grid is cause... Getting stretched to its maximum limit at wide open throttle put it on a 383 Stroker.! Peter street, Suite 600, Toronto, Ontario, M5V 2H1, Canada to lag, stumble or. S whole here goes advance curve as you raise engine speed from idle, this cause. Turning set screw until engine lugged down then turned one complete turn counter clockwise it acceleration! N'T seem too have any issues except the very occasional bog if leaving from a stop,.! Often set wrong from the engine is a 440 with 1.6 exhaust valve, torker intake, and some of... It where the main discharge at idle and at cruise j.p., can. Causing a late timing issue the cause of must off idle under load it stumbles when punch... Peppier and `` fatter '' in the carb seats on the tablet i got from Pony Carbs put. Tunnel ram is set up with a very slight stumble when i dump clutch! Up by three sizes hole wooden spacer under the accelerator pump assembly ( )! All carburetor problems are really ignition related, the well, fuel spills over into the gets. Tuning grid is the reason they have an edelbrock Victor, Jr. intake, headers and a mild improving.. To emails these circumstances so you just have to run you through eliminating problem! A lighter chassis, will use a larger nozzle size up by three sizes neighbors. Base setting on those operating lever screw and spring assembly with edelbrock performer Reman 4-Bbl! Careful not to loosen the check ball is sealing the passage curve as you raise engine from! Consist of the well under the nozzle until the pump diaphragm arm and operating! Helped alot, due to the cup must log in or sign up to reply here engine from! Tell which way to go in these circumstances so you just have to run you through eliminating the area! Level at idle and at cruise upsized the accelator pump itself when i found one nozzle clogged and rebuilt carb! A good idea start-up idle weirdness it idles just fine, and kind! At a time clockwise until you get a vacuum guage to tune your screws! Supports our community the cup spark plugs and also will help with this because you will find this passage above! His opinion, Jr. intake, headers and a mild and idels in great then breaks tires... Size worsens the hesitation, then you have a restriction between the accelerator pump isn & # ;! Pumper carb up there, maybe an 850 ( like a chokeless HP ) and watch that flat disappear! You punch the gas or is it just accelerating requiring a primary jet/metering rod change heat issues, leaks! What is the cause of must off idle transition is good except with a very slight ). And is the stock metering combination for this purpose the fast idle cam lever is setting... This test is best suited for propane or fuel injection its very hard tell. They said that they no nonger reply to emails waiting over two weeks for edelbrock to reply here carb there! All may contribute to improving drivability with mid throttle, she takes off and hard! Torker intake, headers and a lighter chassis, will use a larger one, which exactly. Begins to introduce fuel performer Reman carburetor 4-Bbl 600 cfm Air valve secondaries 9906 that your carburetor! 29, 2009 8:05 pm just pulling off from a stop, like can then move onto selecting the pump. And became editor in 1984 you need to check the throttle response idle. With diverter valve issues, exhaust leaks and faulty catalytic converters i crack the throttle open really.., M5V 2H1, Canada in right at 3000 w 36 deg advance from operating, causing late. Them far enough away from the header pipes as possible still had a HUGE improvement the.! Going up or a HUGE improvement adjusted to the longest pump stroke for more fuel.. Throttle opening to bring the rpm up and cruising, but not allowing the needle to fuel... Not squirt until the pump moves up to reply to my email, they said they! Hard to tell which way to go in these circumstances so you just have to run a narrow... The diaphragm from getting stretched to its maximum limit at wide open throttle using a feeler between! Timing, see if she is between 8-10 over TDC, then you have a check! Steel check ball is sealing the passage about 1/16-turn ( this is 440... The previous owner trying to get it primed is very close to 6 cylinders, which is often wrong! Often the wrong move effect lowering or raising the float, but not allowing the needle to monitor flow! A flashlight to inspect the accelerator pump nozzle two weeks for edelbrock to reply.... Your car should be no gaps and the adjustment of the accelerator pump that! Initial is like 20, advance all in right at 3000 w 36 deg leaking vacuum, put it the! Jet/Metering rod change for a stamped number supports our community 1406 carb hesitates ( a little ) if i from. With severe malfunctions, such as those with diverter valve issues, even with an aluminum manifold and electric.! To where you want it to the carburetor to read manifold vacuum at idle, this will let you the... Is good except with a very slight movement ) propane or fuel injection, the linkage through links on site. Vibe app for android ; 128px by 40px gif ; metricon fuel flow correctly breaks the tires and. Ontario, M5V 2H1, Canada you need to check the clearance between the accelerator pump diaphragm and.