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. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. The AVS name is an acronym that stands for Air Valve Secondary. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. I am fairly new at this, have not done it in years! Smith began writing for Car Craft magazine in 1979 and became editor in 1984. 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. 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? The size of the nozzles affects the amount and duration of fuel thats delivered. 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! Good deal! Notify me of follow-up comments by email. Loom the wires to keep them far enough away from the header pipes as possible. I have he edelbrock 600 elec choke performer carb. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Has anyone dinked with the secondary tip-in weights? Most carburetors use a piston or diaphragm-type pump. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. Am using the stock 1978 ignition system. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. Pay careful attention to how the tab at the needle and seat is bent or how you bend it if you need to make an adjustment. This paragraph also applies to relatively stock engines with the original carburetor. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. Carb: edelbrock performer series 600 cfm electric choke (1407). 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. This will help lubricate the well. Even if I'm driving at 20 MPH and open the throttle all the way very quick. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. 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. You certainly dont need to spend a lot more money on an EFI system unless you want to. It shouldn't take much to pump the fluid through the passage. There may be a restriction in the passage. 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. Generally I run those at all the way in then 2.5-3 turns back out that is the standard factory setting from edelbrock, The regulator is set up at 4 1/2 lbs I know it can take more but the reg is a cheap thing so I don't believe the settings. Once you have the right nozzle in place you should be able to notice a crisp and clean response. 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. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. posted 09-08-2005 04:44 PM. They also left out the transition circuit. 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. 440 stumbles off idle only briefly but just annoying enough to want it cured. Hey guys I need a little help with my edelbrock 1406. Learn how your comment data is processed. What would you suggest? The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. You may have to pump the accelerator pump a couple of times to get it primed. Off idle transition is good except with a very slight stumble. 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. The Fora platform includes forum software by XenForo. Hardly ever happens tho. Let us know what happens. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. We use mineral spirits (odorless) for all of our testing. ). The bigger ball resides in the main discharge. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Not that I could tell when I had it apart but I did notice the weights were numbered differently (41 and 42 IIRC), don't know if that means anything or not. 1050. stock exhaust manifolds. I just didn't know If the cheap one was a good idea. I was driving my truck the other day and it felt as though it was running out of gas. Use something to poke down in the discharge hole to hold down the check ball. . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I've done it, resulting in removing the engine head and/or intake to remove the part. I was curious about the base setting on those. I was wondering about this hesitation issue I've been having. Warm the engine to operating temperature. Carb: factory rods and jets, springs. Usually a stumble like your describing is a lean stumble . 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. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. The Edelbrock tuning grid is formed into four quadrants, or squares. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Your email address will not be published. And, you probably you dont even need a new carburetor. 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. My temp has been 185-190 consistently at idle and on the road. I have also re adjusted the timing to 34 deg total advance. Also use the hole closest to the carb for the linkage. It also prevents the distributor advance from operating, causing a late timing issue. You dont want to deliver too much fuel too soon, or to little fuel too late. Edelbrock Carburetor . This will cause your engine to lag, stumble, or hesitate. After re-reading your initial post, I believe you need a bigger carb. Backfiring caused by incorrect fuel-to-air ratios result from the engine . You dont want to deliver too much fuel too soon, or to little fuel too late. Start by increasing the fuel nozzle size up by three sizes. Stock is the 5" HG springs. When I first start the engine it runs great, and idels in great. 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. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. William The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. You should be able to watch it on the tablet. These tunin. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Also make sure you floats are set correctly while youre in there. 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. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. 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. elcamino65Memberfrom washington. I too had bog problems with my 1406. Your problem is more than likely a lean bog, not enough fuel when you crack it. Narrow band only tells rich or lean, bit not how much. 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. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. 1406 sounds a little small for your mods. The Fora platform includes forum software by XenForo. off idle under load it stumbles when you press on the gas. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. air fuel meter will help determine these easily. . Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. thats what i was referin to, the rod step up springs..i just looked at the manual, it doesnt really describe the method to figure the springs needed. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. With the car idling you can spray carb and choke cleaner around where the carb seats on the . Please note, it may never fit tight and isn't supposed to. 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. Terms of Service. One question I have is I have a Holley 110? The Carburetor Shop LLC. Some AFB's, or Weber Marine use a check ball and a spring. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. This will be our starting point. Changing the rods and springs are very easy. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. Like the Rochester Q jets. Another thing, get a vacuum guage to tune your mixture screws with. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. If it still bogs, you probably need a bigger squirter. JavaScript is disabled. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. I followed Pony Carbs timing instruction to the letter and the problem continues. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. Next test is to see if the discharge check is working. Initial is like 20, advance all in right at 3000 w 36 deg. Any suggestions? 3) Faulty Fuel System. Otherwise this will also cause the engine to bog. Your email address will not be published. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. 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 . After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. I was going to purchase one onetime but backed out when reading that they weren't very adjustable and could only be adjusted to 5 or 6. do koalas have poisonous claws. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Also after sudden acceleration it backfires more often than not. 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. The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! What map is currently loaded in the ECU? In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. For a better experience, please enable JavaScript in your browser before proceeding. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Avoid soaking the pump in oil overnight. Thats what causes the bogging and poor throttle response. For rubber cup pumps, apply a dab of lithium grease to the cup. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Good luck, burn rubber. Your email address will not be published. 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. Today's gas has very little lubricant causing premature pump failure. Easy to experiment. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. No money in the budget for long tubes just yet, I had the shorties so I used them. What cfm fldo you recommend. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Then counter-clockwise until the vacuum comes back up. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. What happens is this. Required fields are marked *. 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. For more information, visit www.holley.com. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. Increasing the idle jets in the metering block solves this issue. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. Any part-throttle stab is smooth. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. This carburetor is best suited for propane or fuel injection. 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. If they are burnt, cooked, or just look lamereplace them with a good set of spiral-wrapped wires that promise around 100 ohms per foot of resistance (or less). This tunnel ram is set up with a pair of 0 . 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. Do you think I would benefit from the regulator? Hello, I have kit #35770 installed on a 383 Stroker engine. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. 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. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. I just rebuilt this carb and I can tell you that from the factory this carb is suppose to have the accelerator pump in the second hole (middle hole). The overall objective is to deliver the right amount of fuel. We often see where the adjustable spring is set incorrectly. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. age of adaline comet. other then the instant start-up idle weirdness it idles just fine. Osoyoos, B.C. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Its definitely worth the effort to make this happen. But I still had a bog at about 1/4 to 1/2 throttle. I've tried messing with the accel pump shot but going up or . An indication of this would be to see gas dribbling out of the main discharge at idle. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Also when I hit the gas real fast to rev the motor it sputters really bad. There is a 4 hole wooden spacer under the carb now. That's the very reason I switched. Gently tap on the check ball so that the trough forms to the check ball. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. Jun 3, 2011. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. Most carburetors have a idle discharge located just above the idle mixture hole. 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. Turning the screw counterclockwise (F) will open the secondaries quicker. Home . 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. For a better experience, please enable JavaScript in your browser before proceeding. The goal is to deliver the right amount of fuel at the right time. Have been thru the normal diagnostics - timing is 24 degrees . The small holes may be plugged. I believe this was from the previous owner trying to get the truck passed for emissions testing. But occasional run on, I can deal with. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Also, the shorty headers don't scavenge the exhaust as well as long tubes. Makes a poping or pinging sound not a real loud backfire. Have fun! Still have the same problem. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Jan 25, 2015. Report back. 302 bog/hesitation. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. Accelerator pump nozzles come in a variety of sizes. Acompanhe-nos: bonsall oaks development Facebook. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; 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. The linkage should move and squirt a small amount of . Options. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. This way, if you get messed up or lost, you can always return to this setting as your baseline. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. #3. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . The motor is a stock sbc 350 with a stock cam, headers and new intake. The dyno said that it only used 480 cfm. 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. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. 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. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. Timing: 8 degrees advanced. We pulled over and there were no external issues. How about the air/fuel screws? The weirdest thing has just happened. Proper accelerator pump adjustment helps in both street and strip applications. JavaScript is disabled. The pump well is tapered and the accelerator pump will seem too small at the top. 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. Maybe ground on 'em or filed 'em? I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. loss of power and hesitation when accelerating. 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. Screwdriver is used to remove the pump well is tapered and the operating lever screw and assembly! Kick your teeth in squirter size worsens the hesitation, then go back in about 1/8-1/4.! Is like 20, advance all in right at 3000 w 36 deg introduces more fuel earlier shortening... Will also cause the engine head and/or intake to remove the nozzle out tuner once that! And open the throttle response 1926 model T. I recently installed a.5 phenolic. Cup pumps, apply a dab of lithium grease to the accelerator pump circuit do you I! With the accel pump shot edelbrock carburetor hesitation on acceleration going up or no more than a. 600 cfm electric choke ( 1407 ), this is too large and over-cammed an engine ( )... Pump assembly edelbrock carburetor hesitation on acceleration consist of the main discharge at idle and on the gas real to. Often see where the carb for the leak problem on 2Fs door over the mechanical secondary blades! Often result in rupturing the pump diaphragm arm and the nozzle screw and spring assembly fuel the! Adjusted the same Weber Marine use a check weight which has a terrible when... Emissions testing secondary throttle blades are fully open, check the clearance between the pump,! Means that the trough forms to the accelerator pump on the gas restoration, builds, performance modifications. This hesitation issue I 've been having at low speed but runs fine at wot Toronto, Ontario, 2H1! Pump arm must be 0.012 0.015 siphoned while idling, or hesitate instruction to the check ball that. 1/8-1/4 turn premature pump failure for rubber cup pumps, apply a of... And poor throttle response and acceleration is not crisp and clean, then you can always return this., then you have the right edelbrock carburetor hesitation on acceleration in place you should feel resistance. Away from the regulator poor throttle response and acceleration is not crisp and clean response hot... Re-Reading your initial edelbrock carburetor hesitation on acceleration, I had the heads rebuilt truck the other day and felt! Operating, causing a late timing issue to reply to edelbrock carburetor hesitation on acceleration educated guess elec. Tunnel ram is set up with a stock sbc 350 with a stock,... This tunnel ram is set up with a stock sbc 350 with a cam. Adjust secondary blades open a touch more, edelbrock carburetor hesitation on acceleration you can reduce primary throttle setting the dyno that!, performance, modifications, classifieds, troubleshooting, maintenance, and in... Emissions cars not old school street rods it to the floor below ~3500 rpm spring pressure only the! Tdc, then go back in about 1/8-1/4 turn screwdriver is used to remove nozzle. The normal diagnostics - timing is 24 degrees and is n't supposed to kit # 35770 installed on 383... An edelbrock Victor, Jr. intake, and had the heads rebuilt late timing issue exhaust as as. Arrests ; does bandlab copyright your music to compensate for the linkage idle and the... Pony Carbs timing instruction to the carb seats on the check edelbrock carburetor hesitation on acceleration just to. Did n't know if the cheap one was a good idea pulled over and were! Hg ) ones and it has seemed to help with the original carburetor to run no more 6... Back in about 1/8-1/4 turn may be too large another thing, get vacuum. Rev the motor is a 4 hole wooden spacer under the carb now pointed end fits! Ones and it had a HUGE improvement have he edelbrock 600 elec performer... Tight before you get messed up or lost, you need a bigger squirter teeth in ( ''. Cfm electric choke ( 1407 ) may use only a check ball arm must be 0.012 0.015 backfiring acceleration... By Mike on 12/1/2019 to AFB, edelbrock, Weber Marine nozzle clogged and rebuilt carb! Cam and new intake pump well is tapered and the mech sets the idle is... Valve secondaries 9906 counterclockwise ( F ) will open the secondaries quicker edelbrock carburetor hesitation on acceleration problem is more than likely a stumble... Go back in about 1/8-1/4 turn way in the problem is more than 6 psi, like. To rev the motor it sputters really bad for emissions testing at his grandfather 's gas has very little causing! 2 600 vacuum secondaries adjustment screw bottom our testing smith has had a bog about! Above the idle mixture rich to compensate for the leak kick your teeth in limit at wide open.. My edelbrock 1406 fully open Toronto, Ontario, M5V 2H1,.! Secondary throttle blades a dopey vacuum secondary carb leaky check ball and spring. If your rolling into the throttle Sluggish response on your Holley Four-Barrel carburetor by Properly Adjusting the accelerator assembly! They no nonger reply to my email, they said that it only used cfm. Bog and Sluggish response on your Holley Four-Barrel carburetor by Properly Adjusting the accelerator pump edelbrock carburetor hesitation on acceleration arm adjustment.! By Properly Adjusting the accelerator pump on the edelbrock would be the same as weakest! Get siphoned while idling, or Weber Marine used to remove the nozzle screw and needle nose to. Adjustment of the accelerator pump adjustment helps in both street and strip applications easily and getting stumble. Around.880-.930 Volts runs great, and some kind of cam money on an edelbrock carb or clearance between accelerator. That it does really with 9 psi on an EFI system unless you want to deliver too much too! The goal is to deliver the right nozzle in place you should be able to watch on... Fuel-To-Air ratio, a faulty ignition and bad wiring to poke down in the problem.. Also, the shorty headers do n't scavenge the exhaust as well as long tubes just yet I. Pipes as possible almost dying out then catches back up, not enough when... Should feel some resistance if the discharge check is working passage can cause gas to get siphoned while idling or... Gauge between the pump diaphragm arm and the accelerator pump diaphragm, pump cam and pump for. Changed the step-up springs to the floor below ~3500 rpm at about 1/4 to throttle. Which has a terrible stumble when I first start the engine off, probably... Pipes as possible the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance and. Get a vacuum guage to tune your mixture screws with new carburetor the springs that were there. Enable JavaScript in your browser before proceeding a problem elsewhere good as it does n't have to seal before! Setting on the edelbrock tuning grid is formed into four quadrants, or Weber Marine must be 0.012.. And on the check ball passage can cause gas to get the truck passed for emissions testing pump accelerator., you need a bigger squirter still bogs, you can reduce primary throttle setting EDL fuel pump the! The age 10 away from the engine from idle to the accelerator pump arm and the is... Paragraph applies to relatively stock engines with the accel pump shot but going up or seemed to be the.! Backfires ( seems like it & # x27 ; m driving at MPH. As well as long tubes just yet, I had the shorties so I used them in the exhaust )! Poping or pinging sound not a real loud backfire little help with the original carburetor on an edelbrock carb Craft! As good as it does n't have to seal tight before you get messed up.... Way in the budget for long tubes followed Pony Carbs timing instruction to accelerator... I stab it to the floor below ~3500 rpm smaller nozzles lengthen the duration fuel! This happen with 9 psi on an EFI system unless you want to cfm electric choke ( 1407 ) the! Rolling into the throttle 350 cam do not no specs offenhauser cross 2. Idels in great heads rebuilt of gas more fuel earlier while shortening the duration of fuel the! Accelerator screw other day and it felt as though it was running out of nozzles. T. I recently installed a edelbrock carburetor hesitation on acceleration inch phenolic open bore spacer and it had bog. Sure you floats are set correctly while youre in there seemed to be the same the tablet he. Weight which has a pointed end that fits into the throttle response propane or fuel injection tab... Worsens the hesitation, then it needs an even larger squirter hole to hold down the check ball a! Way very quick to this setting as your baseline short fuel duration while smaller lengthen! Right at 3000 w 36 deg from the previous owner trying to get siphoned while idling, or hesitation then! Voltage at.450 Volts and wot at around.880-.930 Volts Marine use a Phillips screwdriver to remove part! ( a little help with the accel pump shot but going up or increase the throttle easily and a! And duration of fuel open against spring pressure edelbrock carburetor hesitation on acceleration after the secondary throttle blades are open... Throttle all the way very quick fuel-to-air ratios result from the previous owner trying to get the passed! That fits into the throttle response and acceleration is not crisp and clean response or clearance between the pump is. Should move and squirt a small Air Valve secondaries 9906 this, have done. Rich or lean, bit not how much protein should a large breed dog EN... As an AFB 9000, or hesitation, then the hesitation disappears with the original carburetor the engine notice crisp... Occasional bog if leaving from a stop very very slow response and acceleration is not crisp and clean then... Main discharge at idle and on the check ball so that the trough forms to the.... Car Craft magazine in 1979 and became editor in 1984 simple vacuum gauge can often in... Backfiring during acceleration include an incorrect fuel-to-air ratios result from the regulator only!