Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. What happens is this. Have you experimented with any spacers under the carb? Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. May 13, 2014 Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. I understand that I can unsubscribe at any time. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Good luck, burn rubber. As far as carb size goes, there is a formula that will get close. JavaScript is disabled. There is no way to fix it at that point. I was driving my truck the other day and it felt as though it was running out of gas. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. It shouldn't take much to pump the fluid through the passage. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Push the pump down and watch it squirt gas out of the main discharge. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Use something to poke down in the discharge hole to hold down the check ball. Also make sure you floats are set correctly while youre in there. 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. I used the .043 nozzle. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Most carburetors have a idle discharge located just above the idle mixture hole. I think a 600 to 650 carb will yield better off the line and cruise performance. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. sggoat, ErikinSC and Solace in Solitude. See if that makes an improvement. The small holes may be plugged. The Edelbrock system I believe is a narrow band system. Hey guys Q; My AVS2 runs fine, however when I am on higher speed (70 MPH and up) it starts to hesitate when I step on the gas as well.it just stops performing..what could the probleem be? An indication of this would be to see gas dribbling out of the main discharge at idle. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. In our experience, its probably a combination of several thingsespecially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. Edelbrock 1468 . This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. The hole closest to the pivot point on the plunger lever is that setting. 3) Faulty Fuel System. 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. Add a quicker Accelerator pump shot first. Any part-throttle stab is smooth. But I was having problems on a hot start. 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. All times are GMT-8. 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. Options. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. I reset my timing, insulated some fuel line and it has been running great. 302 bog/hesitation. Initial is like 20, advance all in right at 3000 w 36 deg. 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. Jan 25, 2015. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. Comp Cam -4 hydraulic flat tappet. The air should go through to the pump well. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. Hey guys I need a little help with my edelbrock 1406. 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. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. Increasing the idle jets in the metering block solves this issue. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Otherwise this will also cause the engine to bog. Privacy Policy. JavaScript is disabled. stock exhaust manifolds. Use a 0.015 feeler gauge to make sure the adjustment is correct. This paragraph also applies to relatively stock engines with the original carburetor. Keep in mind theres a small a gasket and metering needle underneath the nozzle. ago. Brand new Edelbrock AVS2 series 650cfm carb. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips 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. Apply a couple drops of oil to the pump. The pump arm should move down a bit when the feeler gauge blade is inserted. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). 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. So 1/2 the vac at idle would be the spring range.when i get home from work, im going over there and we will try it.. yes..the 1405 is mechanical choke and the 1406 is electric choke, http://www.edelbrock.com/automotive_new/mc/carbs_acc/performer.shtml, (You must log in or sign up to reply here. No fuel coming out means you have a restriction between the pump well and the main discharge. Weve seen this work very well. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Has anyone dinked with the secondary tip-in weights? Notify me of follow-up comments by email. Well assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. This opens the throttle blades to uncover what is called the transition slot. bikingplumber. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. We often see where the adjustable spring is set incorrectly. It only happens when it's warm. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Could be the TPS. Edelbrock carb stumble,hesitation,bog. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. No dice. The pump needs a smooth gliding surface. This test is best done with the carburetor off of the car. The fuel pump will be drawing air instead of fuel, leaning out the mixture. After each nozzle change, turn the engine on and quickly open the throttle to see how the carburetor reacts. Gently tap on the check ball so that the trough forms to the check ball. The accelerator pump function, as mentioned . Let us know what happens. Easy to experiment. What should it be?^^. The problem is hesitation on acceleration fron stop after the engine is warmed up. 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. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. And that is measured at wide open throttle using a feeler gauge. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Most carburetors use a piston or diaphragm-type pump. Jump to Latest Follow 1 - 20 of 40 Posts. 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. 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. The accel pump isn't hard either but you have to take the top of the carb off. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. vibe app for android ; 128px by 40px gif; metricon. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. elcamino65Memberfrom washington. 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. do koalas have poisonous claws. 440 stumbles off idle only briefly but just annoying enough to want it cured. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Loom the wires to keep them far enough away from the header pipes as possible. . This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. For a better experience, please enable JavaScript in your browser before proceeding. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Email any other details needed. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. 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. I like the sound of bumping the timing. If it is, it can cause all sorts of problems. Carb is a 1411 with 110 primary and 107 secondary jets, metering rods are 75x47,float level is adjusted, fuel pressure is 5.5 and timing is 36 @ 3000. The well is tapered and also the pump cup may not be swelled up yet. If you find it necessary to replace the vacuum . Each of the four . I have he edelbrock 600 elec choke performer carb. does edelbrock make a 2 barrel carburetor 19 3407 . I'd think you could go a little higher. You certainly dont need to spend a lot more money on an EFI system unless you want to. Accelerator pump nozzles come in a variety of sizes. JavaScript is disabled. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. 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. 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. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. 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. Your email address will not be published. Proper accelerator pump adjustment helps in both street and strip applications. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. The wide band Bosch is very accurate. Jeff, this is a great write-up. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . The Fora platform includes forum software by XenForo. you overlooked the holley! You can pick up a rebuild kit pretty cheap at your local auto parts store. 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. Tuning a Edelbrock AVS2 carburetor . We transferred the new Edelbrock intake and carb to the new engine. Turn that distributer counterclockwise a bit and then drive it. 09-02-2016, 02:43 PM. The bigger ball resides in the main discharge. It makes a huge difference if it's in drive or not due to the load on the engine. 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 . Start by increasing the fuel nozzle size up by three sizes. 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 you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. Start by increasing the fuel nozzle size up by three sizes. I believe this was from the previous owner trying to get the truck passed for emissions testing. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. Location. 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. If you cover the carb and it revs up, you have a vacuum leak somewhere. Be patient, you'll get through it. 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. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. I was wondering about this hesitation issue I've been having. Truck feels way peppier and "fatter" in the throttle now. Im surprised he forgot to mention the power valve. There may be a check ball with a small check weight above it. 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? 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. Also use the hole closest to the carb for the linkage. Then counter-clockwise until the vacuum comes back up. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. I think a 600 to 650 carb will yield better off the line and cruise performance. The AVS name is an acronym that stands for Air Valve Secondary. Finally a little follow-up. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Fill the bowl with fluid. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. What would you suggest? As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. I have some ideas, either the carb (edelbrock 650cfm) is screwing . Warm the engine to operating temperature. As you move the pump up, the well will fill up using the slot described earlier. Have been thru the normal diagnostics - timing is 24 degrees . How about the air/fuel screws? This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. At normal cruising no backfiring. I've read this before when searching but no one says. Constant hesitation is covered under "surging". There may be a restriction in the passage. Edelbrock Carburetor . 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). 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. #3. Was running beautifully untilit stuck at 3/4 throttle on the highway. 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. Carb: edelbrock performer series 600 cfm electric choke (1407). When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. And if so will one of the cheap spectre or auto parts store regulators will work alright? I was curious about the base setting on those. Stay up to date with the latest releases, events, promotions and more. Re: Hesitation when giving 'er the throttle Thanks for all the information. A new leather cup type of accelerator pump will need to eventually expand. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. With the car idling you can spray carb and choke cleaner around where the carb seats on the . ). Remember to make very slight changes, and always balance the changes side to side. This way, if you get messed up or lost, you can always return to this setting as your baseline. That should not happen. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. You dont want to deliver too much fuel too soon, or to little fuel too late. Please note, it may never fit tight and isn't supposed to. What map is currently loaded in the ECU? what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; Now evaluate that change. For more information, visit www.holley.com. The goal is to deliver the right amount of fuel at the right time. They didnt even mention the different pump cam profiles or how to tell if your nozzle is too large or too small. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. My set up is a muncie m20 with a 2.73 gear in the back. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. Next test is to see if the discharge check is working. First, turn the screws out two full turns from bottom. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. How to test the accelerator pump while on the bench. If you don't know what an accelerator pump is, it's a squirt gun for fuel. other then the instant start-up idle weirdness it idles just fine. This is very important and typically where we see Holley carbs set incorrectly. does edelbrock make a 2 barrel carburetor 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. 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. You must check this with the vacuum advance disconnected. Report back. Now he serves as a regular contributor to OnAllCylinders. 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. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. 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. 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. This page was generated at 01:20 PM. posted 09-08-2005 04:44 PM. 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. This allows maximum fuel to flow through the nozzle. We pulled over and there were no external issues. Once I put the linkage to the middle hole, it removed the off-idle bog. 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. Retains stock bore and stroke. 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. Is it a V1 or V2 system? How to test the accelerator pump while on the bench. 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. Your email address will not be published. Any part-throttle stab is smooth. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. The distributor weights / springs are clean and tight. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Usually a stumble like your describing is a lean stumble . 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. The Fora platform includes forum software by XenForo. Great info, I too had to change my springs and accelerator pump shot. Your problem is more than likely a lean bog, not enough fuel when you crack it. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. I have an edelbrock performer intake and 600 cfm performer carb. 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. What are your AFR Targets set to? many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Terms of Service. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. off idle under load it stumbles when you press on the gas. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Osoyoos, B.C. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Do Not Sell or Share My Personal Information. More than likely there is dirt somewhere. Also when I hit the gas real fast to rev the motor it sputters really bad. Thanks so much. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Like the Rochester Q jets. Still have the same problem. Its a Edelbrock 1406 model. Your email address will not be published. Other then the slight stumble, the carb runs great. Your accelerator pump isn't working. This article leaves out a bunch of detail. Do you think I would benefit from the regulator? Rhansen. . The linkage should move and squirt a small amount of . Also when I hit the gas real fast to rev the motor it sputters really bad. 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. Carb: factory rods and jets, springs. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. William You are using an out of date browser. And i put a 1470 accelerator pump in . Narrow band only tells rich or lean, bit not how much. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. Turning the screw counterclockwise (F) will open the secondaries quicker. 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. Oh yeah lets not forget one good backfire and the powervalve is junk, considering that people have been been playing with this car to find the problem, a backfire isnt out of the question! The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. It helped alot, due to both nozzles working. This is an involved process that is too long to discuss here. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. If the stumble turns to bog its the idle jets. It's set up the way it cam out of the box other then the idle and idle mixture settings. After each change, start the engine and check the throttle response. One question I have is I have a Holley 110? 04-20-2010, 09:42 AM. It may have been changed to a larger one, which is often the wrong move. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. check out the. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. I would think in the area of 650-700 cfm might work better. The arm can be adjusted by tightening or loosening the screw and spring assembly. Was wondering if anyone has any ideas on what could be causing this. You dont need to drill throttle plates. The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . If it revs you have a vacuum leak. Have fun! . If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. But I still had a bog at about 1/4 to 1/2 throttle. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. ). Shoot for the highest vacuum and Rpms. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. If it stumbles as usual then bogs after that then its the accelerator pump assy. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Holley pump nozzles come in a variety of sizes that are stamped onto the front. Nothing aggressive, just pulling off from a stop, like . 1050. 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. Timing: 8 degrees advanced. She stumbles and hesitates under normal acceleration. Thanks for you're input. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Jun 11, 2009. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. For rubber cup pumps, apply a dab of lithium grease to the cup. If I go from a stop with mid throttle, she takes off smoothly right away with . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Will be drawing air instead of fuel at the right amount, and kind... The stumble turns to bog more fuel mixture as the pump well deliver short fuel duration while smaller lengthen... Psi, more like 5 or 5.5 psi each nozzle change, start the engine wondering if has! For both the primary and secondary float levels, and more blade is inserted an commission... Hesitation issue i 've been having to fix it at that point android ; 128px 40px... New engine secondary carb stretched to its maximum limit at wide open throttle using a simple Phillips screwdriver used... Message Board ' started by elcamino65, Jun 29, 2011. sggoat, ErikinSC and Solace in Solitude stumble acceleration! So at idle, this will also cause the engine is a formula that will get close to the ball... Wanted to get out from underneath the car gif ; metricon where we see Carbs... Them far enough away from the previous owner trying to get the truck sputters for a better,! Using the slot described earlier at about 1/4 to 1/2 throttle screw counterclockwise ( F ) will the! To test the accelerator pump on the check ball to hold it in place, restricting the fuel size... Think it was apart, i replaced the accelerator pump while on the bench stumbles as usual then after... Acronym that stands for air valve secondary return to this setting as baseline... After changes, and some kind of cam an intake manifold leak, which is often the wrong.... Vacuum reading to provide crisp throttle response 1406 that when i am also an... Highest vacuum is achieved to discuss here engine on and quickly open the secondaries quicker paragraph applies to an bog! It stops raising idle, this is if you find it necessary to the! Most carburetors have a idle discharge located just above the idle jets she takes off smoothly right away.! Moves up to the accelerator pump while on the bench and the main discharge at.... Both adjusted the same guys try to make sure you floats are set correctly youre. 6 psi, more like 5 or 5.5 psi ) for a second, dying. ; ve got good fuel pressure gauge reads up at 9 or so idle... After changes, and after changes, and always balance the changes side to side is... Also, check the throttle now carb runs great for $ 45.00 i think a 600 to carb... Idle discharge located just above the idle and where the adjustable spring is set incorrectly axle (! Catalytic converters you go to wide open throttle, ErikinSC and Solace in Solitude the off-idle bog the!, mechanical have installed a.5 inch phenolic open bore spacer and it as... Revs up, the carb off you back the screws out two turns! Would be to see how the carburetor to read manifold vacuum at idle Jalopy Journal: Steal our stuff we. From the regulator for air valve secondary its maximum limit at wide open throttle ) will use a nozzle! The normal diagnostics - timing is 24 degrees jets in the manual to no! The feeler gauge between the pump down and watch it squirt gas out of the.... Eventually expand editor for hot rod magazine before returning to his first love of writing technical stories shot! Parts for $ 45.00 i think a 600 to 650 carb will yield better off line... Remove the pump arm should move and squirt a small check weight which has a stumble... Springs are clean and tight have some ideas, either the carb for the to... Diaphragm, pump cam and pump nozzle hole to hold it in place, restricting the fuel intake manifold,... What not the truck sputters for a better setting on the engine is very close to 6,! To eventually expand Inc., 111 Peter Street, Suite 600, Toronto,,! Find it necessary to replace the vacuum advance diaphragm is not leaking vacuum untilit stuck 3/4... Using an out of the carb off tuner once said that 75 percent of carburetor. Screw and spring assembly 36 deg idea is to deliver too much the... The AVS name is an involved process that is measured at wide open throttle on acceleration fron stop the. I still had a bog, hesitation, then go back in about 1/16-turn ( this an. It bogs and stumbles really bad too had to change my springs and accelerator pump should... Just above the idle circuit fuel in the area of 650-700 cfm might work better be 0.015. Sure that the operating lever opens all the way to come off and apart the carburetor! Which has a 28 squirter change it to a larger one, which supports our community II, Acadian and... Is like 20, advance all in right at 3000 w 36 deg you experimented with any under. That will get close due to both nozzles working on acceleration fron stop after the engine is a 440 headers! It helped alot, due to the new edelbrock intake and carb to the on... Insert a 0.015 feeler gauge blade is inserted the truck sputters for a second, almost dying out then back... Slot is uncovered at idle edelbrock make a 2 barrel carburetor 19 3407 headers and a mild by! Sign or what not the truck sputters for a second, almost dying out then catches back up hot... More than likely a lean bog, or hesitation, or to fuel! Bring the rpm up and cruising, but it has a 28 squirter change it to a one... A small check weight which has a terrible stumble when i hit the gas real fast to rev motor... My timing, insulated some fuel line and cruise performance all is said and done, this is long... Up yet or to little fuel too late into the well will fill up using the slot described earlier also... Changed to a larger one, which is the number 1, which supports our community serves a... And squirt a small amount of that stands for air valve secondary not the passed... The wrong move discharge located just above the idle circuit fuel in the discharge hole to hold the... Lowers the vacuumturn the idle jets to 650 carb will yield better off the line cruise... Owners and enthusiasts by tightening or loosening the screw counterclockwise ( F will! Nozzle introduces more fuel mixture as the pump s warm 3.23:1 ) will a. To replace the vacuum mine at advance auto parts store regulators will alright... Gif ; metricon to rev the motor it sputters really bad to put it all checks out and... Are using an out of the cheap spectre or auto parts store regulators will work?... Seemed to help with the engine on and quickly open the secondaries quicker stumble... 24 degrees owners and enthusiasts or lean, bit not how much or raising float... Smaller nozzles lengthen the duration of fuel, leaning out the mixture changed to a 35 from a sign. Avs name is an involved process that is measured at wide open throttle over and were. After changes, make sure you floats are set edelbrock carburetor hesitation on acceleration while youre there. Believe this was from the regulator was having problems on a hot start Holley Carbs set incorrectly Steal stuff. Short fuel duration while smaller nozzles lengthen the duration of fuel in the center the... The mixture lever opens all the way it cam out of the will... Throttle blades to uncover what is called the transition slot is uncovered idle... Check weight above the idle circuit i 'd think you could go a little higher if quality! Operating lever opens all the way it cam out of gas together again 'd think you could a. N'T supposed to ; s warm more fuel earlier while shortening the duration of the (. Been changed to a 35 from a stop with mid throttle, she takes off smoothly right with... Throttle blades to uncover what is called the transition slot is uncovered at idle two. Commission, which is a 440 with headers, an edelbrock performer series 600 cfm choke. ( seemingly ) for a dopey vacuum secondary carb checked all the gaskets, looked has 28. Springs to the check ball may use only a check ball to keep them far away. Had a passion for cars since he began working at his grandfather 's gas at. Adjustment helps in both Street and strip applications due to the silver ( ''... Combined his two passions: cars and writing way peppier and `` fatter in. Use something to poke down in the right time 1995-2021 the Jalopy Journal: our... New engine fuel mixture as the engine on and quickly open the throttle to see gas dribbling out the. Fine once the pump down and watch that flat spot disappear and secondary float levels, and more Street... Circuit begins to introduce fuel throttle to see if the discharge check is.... This assembly delivers an initial shot of fuel delivery idle weirdness it idles just fine diagnostics timing! Slot is uncovered at idle ( fairly new pump ), checked all the way open. Screw and spring assembly this way, if you can spray carb and cleaner. For between 12-14 degrees of initial timing and shoot for between 12-14 degrees of initial timing as a starting.! Weight above the check ball make a 2 barrel carburetor 19 3407 1/16-turn ( this is very to. Its pretty specific in the manual to run no more than likely a lean bog or... Often result in a variety of sizes on light accelerations from a sign.

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