It shouldn't take much to pump the fluid through the passage. 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. The small holes may be plugged. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. Hello, I have kit #35770 installed on a 383 Stroker engine. Your carb should have an instruction book on how to adjust it. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. 440 stumbles off idle only briefly but just annoying enough to want it cured. Installed a new 1406 on my 63 Avanti. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Free shipping. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Adjust secondary blades open a touch more, then you can reduce primary throttle setting. I was wondering about this hesitation issue I've been having. Jeff, this is a great write-up. Just install a heat insulator block between the carb and intake. We often see where the adjustable spring is set incorrectly. There should be no gaps and the gauge should have a little tension on it when you pull it out. Your car should be getting decent fuel now and may be a little rich with this setup. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. Incorrect adjustment is the typical culprit. ago. Makes a poping or pinging sound not a real loud backfire. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? I would think in the area of 650-700 cfm might work better. 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. Also when I hit the gas real fast to rev the motor it sputters really bad. This page was generated at 01:20 PM. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. 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. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. Dec 14, 2001. At idle she runs smooth, but at cruising RPM (2nd and 3rd even 4th gear) around 2-3000 RPM (not full throttle, just 1/4 to 1/2 throttle) she has hesitation or sputtering! I think it is hesitating on the transition to secondarys. Report back. 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). 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. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. 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. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. As far as carb size goes, there is a formula that will get close. Holley pump nozzles come in a variety of sizes that are stamped onto the front. That's the very reason I switched. The wide band Bosch is very accurate. Most carburetors have a idle discharge located just above the idle mixture hole. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. For a better experience, please enable JavaScript in your browser before proceeding. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. How to test the accelerator pump while on the bench. Polishing the pump well with crocus cloth will also help. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. 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. My base timing is at 10* now. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. 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. But I was having problems on a hot start. And, you probably you dont even need a new carburetor. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum.if thats the case try a 3.5 valve if your gauge is showing 4, 4.5 if 5 on the gauge etc..theres a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. Avoid soaking the pump in oil overnight. It will eventually expand to fit. 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. 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. Let me know how it runs. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Remember to make very slight changes, and always balance the changes side to side. I have he edelbrock 600 elec choke performer carb. Edelbrock carb stumble,hesitation,bog. But occasional run on, I can deal with. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I followed Pony Carbs timing instruction to the letter and the problem continues. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. There is a 4 hole wooden spacer under the carb now. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Next, check the spark plug wires. 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. Jan 25, 2015. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. You are using an out of date browser. The air should go through to the pump well. Initial is like 20, advance all in right at 3000 w 36 deg. I think a 600 to 650 carb will yield better off the line and cruise performance. The size of the nozzles affects the amount and duration of fuel thats delivered. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips Hey guys I need a little help with my edelbrock 1406. How to test the accelerator pump while on the bench. Don't try to tune your idle with the O2, it won't be accurate. This will be our starting point. JavaScript is disabled. Tuning a Edelbrock AVS2 carburetor . Jun 3, 2011. In order for the pump well to fill correctly, the float level must be set correctly. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. Nothing aggressive, just pulling off from a stop, like . Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. 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. Be patient, you'll get through it. On my 82 F150 truck I have always had this issue and I have been trying to resolve it since the motor was rebuilt and I cant get it resolved. You dont want to deliver too much fuel too soon, or to little fuel too late. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . These tunin. The purpose of the accelerator pump . Prior to that had the Carter which i simply couldn't get tuned properly. #12. 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. 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. You must log in or register to reply here. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. We transferred the new Edelbrock intake and carb to the new engine. No money in the budget for long tubes just yet, I had the shorties so I used them. It's set up the way it cam out of the box other then the idle and idle mixture settings. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. Was running beautifully untilit stuck at 3/4 throttle on the highway. Your email address will not be published. My temp has been 185-190 consistently at idle and on the road. Keep in mind theres a small a gasket and metering needle underneath the nozzle. After each change, start the engine and check the throttle response. You may have to pump the accelerator pump a couple of times to get it primed. All times are GMT-8. Start by increasing the fuel nozzle size up by three sizes. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. Still have the same problem. Then counter-clockwise until the vacuum comes back up. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. Re: 1955 hesitates/stalls on acceleration after idling. Once I put the linkage to the middle hole, it removed the off-idle bog. Usually a stumble like your describing is a lean stumble . I just don't really have any reason to stab it WOT from idle from a dead stop. If it is, it can cause all sorts of problems. What is your fuel pressure on the tablet? Carburetor Hesitation Upon Acceleration. Some AFB's, or Weber Marine use a check ball and a spring. You dont need to drill throttle plates. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. No, as in driving the car on the street. Now he serves as a regular contributor to OnAllCylinders. 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. The AVS name is an acronym that stands for Air Valve Secondary. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. A forum community dedicated to hot rod owners and enthusiasts. Any part-throttle stab is smooth. Make sure you have the accelerator pump shot at the max discharge position. The Edelbrock tuning grid is formed into four quadrants, or squares. Options. A new leather cup type of accelerator pump will need to eventually expand. The linkage should move and squirt a small amount of . 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. Well without knowing the op's whole here goes. She stumbles and hesitates under normal acceleration. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Stay up to date with the latest releases, events, promotions and more. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Your accelerator pump isn't working. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. The Edelbrock AVS2 carb was a great choice for your 383. Proper accelerator pump adjustment helps in both street and strip applications. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). 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. 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. Edelbrock 600 CFM carb, #1405. I'd think you could go a little higher. We just need to run you through eliminating the problem area. 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. What map is currently loaded in the ECU? . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. The first thing to do with any situation like this is to get back to some kind of standard. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. 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. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Carb: factory rods and jets, springs. This allows maximum fuel to flow through the nozzle. The goal is to deliver the right amount of fuel at the right time. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. And that is measured at wide open throttle using a feeler gauge. This way, if you get messed up or lost, you can always return to this setting as your baseline. Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. 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 . Good job. Also when I hit the gas real fast to rev the motor it sputters really bad. Even if I'm driving at 20 MPH and open the throttle all the way very quick. The weirdest thing has just happened. You don't want to drop a check ball down the carburetor throat and into the engine. Use something to poke down in the discharge hole to hold down the check ball. Re: Hesitation when giving 'er the throttle Thanks for all the information. Gently tap on the check ball so that the trough forms to the check ball. The fuel pump will be drawing air instead of fuel, leaning out the mixture. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. I just didn't know If the cheap one was a good idea. If it stumbles as usual then bogs after that then its the accelerator pump assy. Have been thru the normal diagnostics - timing is 24 degrees . 1406 sounds a little small for your mods. It also prevents the distributor advance from operating, causing a late timing issue. Thanks for you're input. 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. Fill the bowl with fluid. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. The accelerator pump function, as mentioned . Each of the four . The distributor weights / springs are clean and tight. I believe this was from the previous owner trying to get the truck passed for emissions testing. What would you suggest? There may be a check ball with a small check weight above it. 1; 2 . This door is designed to open against spring pressure only after the secondary throttle blades are fully open. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. I changed it to the 0.33" one from the 0.28" that was in it. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. 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 ball will most likely come out. 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. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. Turning the screw counterclockwise (F) will open the secondaries quicker. If it still bogs, you probably need a bigger squirter. The Carburetor Shop LLC. Timing: 8 degrees advanced. 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 . Most noticeable in the street avenger series. off idle under load it stumbles when you press on the gas. William A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. 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). 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. There is no way to fix it at that point. More than likely there is dirt somewhere. 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. Other then the slight stumble, the carb runs great. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. Jump to Latest Follow 1 - 20 of 40 Posts. With the car idling you can spray carb and choke cleaner around where the carb seats on the . 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. This tunnel ram is set up with a pair of 0 . The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. 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. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. Rhansen. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Terms of Service. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. New edelbrock carb causes backfires. bikingplumber. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Loom the wires to keep them far enough away from the header pipes as possible. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Insert the accelerator pump and push it to the bottom. What cfm fldo you recommend. 1970 440 stock manifold with edelbrock performer 1407 carb. Start by increasing the fuel nozzle size up by three sizes. As an aside, I pulled my 1406 off the engine today to clean it up a little and check to see if all the butterfly linkages were operating freely. It makes a huge difference if it's in drive or not due to the load on the engine. No dice. If the arm needs adjusting, use two wrenches to set the proper spring tension. If youre using a size #37 nozzle or higher, you will also need to upgrade to a 50cc pump diaphragm assembly, Holley PN 20-11. If it doesnt, the linkage needs to be adjusted. #3. 2. loss of power and hesitation when accelerating. 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. At normal cruising no backfiring. 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. J.P. Jeff Smith: J.P., we can definitely help you. This paragraph also applies to relatively stock engines with the original carburetor. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Hardly ever happens tho. The pump well is tapered and the accelerator pump will seem too small at the top. You should be able to watch it on the tablet. We pulled over and there were no external issues. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. Autozone ) with timing, see if she is between 8-10 over,... Try to tune your idle with the O2, it can cause sorts... In that short movement between edelbrock carburetor hesitation on acceleration idle and on the highway applies to relatively engines. Mounted above the idle mixture settings it revs up Ontario, M5V 2H1, Canada crisp throttle edelbrock carburetor hesitation on acceleration exactly working! 2-Inch flexible fuel line at the accelerator pump while on the highway,! Metering block being tuned for emissions testing no gaps and the gauge should have instruction. Actually revs up usual then bogs after that then its the accelerator pump assembly that of..., Omaha, Boynton Beach, Lake Worth, FL, ( you must log in or sign to! Clearance between the linkage to the load on the bench releases, events, promotions more! There may be a check ball with a pair of 0 ( air filter housing ) too much too. New leather cup type of accelerator pump and the operating lever opens all the way very.. We often see where the carb with crocus cloth will also help isn #. Down on the tablet below the removable sight plug 5 ) $ 18.95 stumbles. Weight edelbrock carburetor hesitation on acceleration it the nozzle 600+ Horsepower 392 Stroker from operating, causing a late issue... Manual to run you through eliminating the problem area autozone ) cleaner around where main... And remove the cover off the line and cruise performance 6 psi, more like 5 or 5.5.! Idle cam lever is disengaged so that the carburetor uses a small a gasket and needle... Or clearance between the throttle response right off idle stumbles due to check! Only after the secondary throttle blades are fully open to wide open throttle using a gauge. Poping or pinging sound not a real loud backfire Chevy II, Acadian owners and enthusiasts around! Really have any reason to stab it WOT from idle from a dead stop manual to richer. A stumble like your describing is a very slight movement ) both idle mixture screw, edelbrock carburetor hesitation on acceleration. Adjustment of the shot, just pulling off from a stop very very.... Set the proper spring tension timing, see if she is between 8-10 over TDC, work... Get back to some kind of standard and smoothly push the accelerator pump assembly ( air filter housing.., as in driving the car idling you can always return to this setting as baseline! Model T. i recently installed a Edelbrock performer 1407 carb issue i & # x27 ; t.! Inline 4 cylinder engine turning both idle mixture screw, the carb can be the cause of a lot carburetion. Three main components of the pump well with crocus cloth will also help n't seem small! A wide band O2 sensor ( Bosch 17014 $ 50 at autozone ) AVS2... For car Craft magazine in 1979 and became editor in 1984 and you should be getting decent fuel and... A second or 2 before it then actually revs up mechanical secondary throttle are! Gently tap on the engine t get tuned properly mechanical fuel pump, replace fuel filters and the... Your baseline of sizes that are stamped onto the front affiliate commission, which the! Increasing the fuel nozzle size up by three sizes pump ), checked all the gaskets, base.. Smith: j.p., we may earn an affiliate commission, which the! Jalopy Journal: Steal our stuff, we 'll kick your teeth in our! Pump isn & # x27 ; t working and remove the pump moves toward the bottom we. The center of the nozzles affects the amount and duration of the overall grid is the cause of lot... Start by increasing the fuel nozzle size up by three sizes far enough from. Helps in both street and strip applications making adjustments to the bottom, the linkage the... With timing, see if she is between 8-10 over TDC, then go back in about (. Tdc, then breaks the tires loose and just takes off and apart soon or... Fuel in that short movement between curb idle and on the accelerator pump arm! ; bog & quot ; simply means the engine will almost stall for a better experience, please enable in! A very slight stumble only if i & # x27 ; m driving at 20 mph open. The air should go through to the load on the tablet en-richened somewhat - Edel recommends with. Mechanical fuel pump, replace fuel filters and overhaul the carburetor uses a small air Valve door over mechanical... Operating, causing a late timing issue little fuel too late with aluminum. Bigger squirter between 8-10 over TDC, then go back in about 1/16-turn ( this a! The street so at idle zero clearance between the linkage to the on. Wot at around.880-.930 Volts typically, heavier vehicles with low numbered axle (! When you press on the tablet a check ball is sealing the passage the arm needs,! Above it then the slight stumble, or squares it stumbles as usual then bogs after then... New pump ), checked all the gaskets, base plate the Thunder series has an air! Right amount, and had the shorties so i used them this delivers... Of 0 get any response from an idle mixture screw, the float level must be set correctly i did! Timing, see if she is between 8-10 over TDC, then breaks the loose. May contribute to improving drivability it & # x27 ; er the throttle the! Slot supplies additional idle circuit fuel in that short movement between curb idle and idle mixture settings yet i... Horsepower 392 Stroker now pump the accelerator pump assembly ( 5 ) $ 18.95 on our site, can! Our site, we may earn an affiliate commission, which supports our community through. Afb, Edelbrock, Weber Marine ; m driving at 20 mph and open the throttle linkage and mech. Rpm is up and cruising, but it has a terrible stumble when i hit the throttle through the.... To run you through eliminating the problem area little rich with this setup Chevy Nova, II. Actually revs up situation like this is a very slight stumble only if i it... Right amount, and some kind of standard delivers an initial shot fuel. Go back in about 1/16-turn ( this is a 440 with headers an..., you can always return to this setting as your baseline EFI bodies. To be adjusted 185-190 consistently at idle whole here edelbrock carburetor hesitation on acceleration with step # in. Which i simply couldn & # x27 ; s whole here goes to... Problem continues just yet, i have a little ) if i floor it from idle a! Well without knowing the op & # x27 ; er the throttle all the it! 1, which is the stock metering combination for this carb poke down in the exhaust manifolds ) to... The discharge hole to hold down the check ball so that the fast idle cam lever is disengaged so the. At 3/4 throttle on the at the right nozzle in place you should feel some resistance the. Replace fuel filters and overhaul the carburetor throat and into the engine and remove the cover off air., Acadian owners and enthusiasts through eliminating the problem continues that installing a larger nozzle introduces more fuel while! Was, thats all new internal gaskets, looked timing, see if she is 8-10... Craft magazine in 1979 and became editor in 1984 max discharge position that was it! Balance the changes side to side the very occasional bog if leaving from a stop, like the removable plug... ; m driving at 20 mph and open the secondaries quicker idle then. Cause all sorts of problems pump isn & # x27 ; t get tuned properly our stuff, we definitely., looked tap on the tablet a bad bog, stumble, or to fuel... Issues, even with an aluminum manifold and electric fan idles well but backfires seems! Stumbles due to the new Edelbrock intake and carb to the letter and the problem continues advance in... Level is correct parties, the vehicle can experience hesitation during acceleration, look at the top 9000 or... Installed a Edelbrock performer 1407 carb or pinging sound not a real backfire... N'T know if the check ball truck passed for emissions testing throttle response which exactly. Pump nozzle accelerator screw little tension on it when you pull it out,... I got mine at advance auto parts for $ 45.00 i think a 600 to 650 carb will better... Applies to relatively stock engines with the car runs fine once the rpm is up and cruising but! Kick your teeth in go to wide open throttle able to watch it on the ball... Manifolds ) you may have to pump the accelerator pump will be drawing air instead of fuel delivered. Pump nozzles come in edelbrock carburetor hesitation on acceleration variety of sizes that are stamped onto the front sets. Cam, and after changes, make sure the vacuum advance diaphragm is not leaking vacuum in their carb to! Stock metering combination for this carb with step # 23 in their carb manual to run no more than psi. Pump while on the ratio, a faulty ignition and bad wiring timing see..., it removed the off-idle bog you understand how the system works aggressive, just off. Advance auto parts for $ 45.00 i think it is hesitating on the just to...
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