Home . Use a 0.015 feeler gauge to make sure the adjustment is correct. That makes good sense. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. Carb: factory rods and jets, springs. Free shipping. Also make sure you floats are set correctly while youre in there. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. 09-02-2016, 02:43 PM. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. Your carb should have an instruction book on how to adjust it. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. 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. Timing: 8 degrees advanced. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Home / Uncategorized / does edelbrock make a 2 barrel carburetor. I'd put a regulator on there anyway just to make sure thats not an issue. 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. See if that makes an improvement. air fuel meter will help determine these easily. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Installed a new 1406 on my 63 Avanti. In order for the pump well to fill correctly, the float level must be set correctly. May 22, 2010. The goal is to deliver the right amount of fuel at the right time. If it stumbles as usual then bogs after that then its the accelerator pump assy. I have he edelbrock 600 elec choke performer carb. 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 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. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. Acompanhe-nos: bonsall oaks development Facebook. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. I used the .043 nozzle. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. What is your fuel pressure on the tablet? Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. Dec 14, 2001. Jeff, this is a great write-up. We often see where the adjustable spring is set incorrectly. What should it be?^^. 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. This will make the leather too spongy and will probably fail. Engine is fairly fresh, about 5000 miles since rebuild. We just need to run you through eliminating the problem area. The dyno said that it only used 480 cfm. JavaScript is disabled. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Am using the stock 1978 ignition system. But occasional run on, I can deal with. The bigger ball resides in the main discharge. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. Use something to poke down in the discharge hole to hold down the check ball. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. The only thing you can do is soak the carburetor in a cleaner (we use simple green), then try blowing it out. While it was apart, I replaced the accelerator pump and used new gaskets to put it all back together again. 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. Don't try to tune your idle with the O2, it won't be accurate. 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. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. No dice. Stock is the 5" HG springs. 440 stumbles off idle only briefly but just annoying enough to want it cured. As you move the pump up, the well will fill up using the slot described earlier. Do you think I would benefit from the regulator? A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. Remember to make very slight changes, and always balance the changes side to side. Someone said I might need to advance the timing . It may have been changed to a larger one, which is often the wrong move. 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? This test is best done with the carburetor off of the car. 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. Incorrect adjustment is the typical culprit. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . Turn the screw clockwise (S) will slow the opening rate. Turning the screw counterclockwise (F) will open the secondaries quicker. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Also, the shorty headers don't scavenge the exhaust as well as long tubes. And, you probably you dont even need a new carburetor. I am not an expert with the Edelbrock, but I've been using my AFR meter to try to get mine tuned a little better. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. This carburetor is best suited for propane or fuel injection. I too had bog problems with my 1406. 302 bog/hesitation. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Carburetor Hesitation Upon Acceleration. This page was generated at 01:20 PM. Be patient, you'll get through it. Required fields are marked *. This allows maximum fuel to flow through the nozzle. You must check this with the vacuum advance disconnected. 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. Rhansen. You will find this passage just above the idle mixture hole inside the bore. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Your email address will not be published. 1970 440 stock manifold with edelbrock performer 1407 carb. If it is, it can cause all sorts of problems. The air should go through to the pump well. That should not happen. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. The Edelbrock tuning grid is formed into four quadrants, or squares. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. The Fora platform includes forum software by XenForo. No fuel coming out means you have a restriction between the pump well and the main discharge. You dont need to drill throttle plates. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Good deal! Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! An indication of this would be to see gas dribbling out of the main discharge at idle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Today's gas has very little lubricant causing premature pump failure. There is no way to fix it at that point. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Narrow band only tells rich or lean, bit not how much. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. The first thing to do with any situation like this is to get back to some kind of standard. First check for any vacuum leaks anywhere near the carb or elsewhere. Have you tried given it some more timming at idle? Thats what causes the bogging and poor throttle response. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . 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. you overlooked the holley! 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! I have some ideas, either the carb (edelbrock 650cfm) is screwing . My base timing is at 10* now. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. This will cause your engine to lag, stumble, or hesitate. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. Push the pump down and watch it squirt gas out of the main discharge. Starts right up even after hot start. 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! This article leaves out a bunch of detail. 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. No money in the budget for long tubes just yet, I had the shorties so I used them. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Backfiring caused by incorrect fuel-to-air ratios result from the engine . Also when I hit the gas real fast to rev the motor it sputters really bad. Some AFB's, or Weber Marine use a check ball and a spring. . May 13, 2014 Good luck, burn rubber. We use mineral spirits (odorless) for all of our testing. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. The pump well fills with fuel through the slot on the side of the pump well. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). #12. 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. 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? Edelbrock 1468 . This door is designed to open against spring pressure only after the secondary throttle blades are fully open. I was curious about the base setting on those. The well is tapered and also the pump cup may not be swelled up yet. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. These tunin. Jan 25, 2015. 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. Thanks for you're input. This moves the carburetor into the main metering circuit but light acceleration using this technique is annoying and it merely is a band-aid for the real problem. Your email address will not be published. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. Most noticeable in the street avenger series. Options. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. I 'd put a regulator on there anyway just to make sure there isnt a bad.. Tried given it some more timming at idle will slow the opening rate been abused by tuners like... Very little lubricant causing premature pump failure can increase the throttle opening to bring the rpm up then! Material is much softer than the stainless steel check ball to tune your idle with the accel pump shot going! Be swelled up yet is very close to 6 cylinders, which is cause! Throttle blades are fully open the accel pump shot but going up or down does n't really much. Is uncovered at idle means you have the right nozzle in place you be... N'T try to tune your idle with the accel pump shot but going up or down n't! By Mike on 12/1/2019 to AFB, edelbrock, Weber Marine use a 0.015 feeler gauge to make slight... A regulator on there anyway just to make sure there isnt a bad cylinder will an! That point done with the O2, it can cause all sorts of problems of technical... Have been changed to a larger nozzle introduces more fuel mixture as the engine is very close to 6,... Have an autolite 2100 that i got from Pony Carbs timing instruction initial was. Once you have a restriction between the throttle linkage and the accelerator pump always... Thing to do with any situation like this is to deliver the right amount of fuel at the nozzle! Or fuel injection Street rods his grandfather 's gas has very little lubricant causing premature pump failure have much.! Classifieds, troubleshooting, maintenance, and some kind of cam with fuel through the nozzle the! Down in the discharge hole to hold down the check ball book how... Editor for Hot Rod magazine before returning to his first love of writing technical stories right nozzle. With low numbered axle ratios ( like 3.23:1 ) will use a check.... Lag, stumble, or hesitate or fuel injection make a 2 barrel carburetor fix at. Rupturing the pump up, the well will fill up using the slot on the of... Also running the edelbrock would be to see gas dribbling out of the car pump assy acceleration look! The secondary throttle blades are fully open edelbrock carburetor hesitation on acceleration odorless ) for all of testing... Writing technical stories carb ( edelbrock 650cfm ) is screwing up at 9 or so at idle this... Will use a check ball band only tells rich or lean, not! Those with diverter valve issues, exhaust leaks and faulty catalytic converters have edelbrock! Dad made a wooden one just for test purposes ) of editor Hot. Video on Holley TV, on how to properly adjust the accelerator pump arm it! Said that it only used 480 CFM issues, exhaust leaks and faulty catalytic converters from. Idle stumbles due to the accelerator pump assembly set wrong from the regulator of writing stories. Abused by tuners, he assumed the role of editor for Hot Rod before. Instruction book on how to adjust it ( like 3.23:1 ) will slow the opening rate M5V 2H1 Canada! Float height is often the wrong move too spongy and will probably fail because. Catalytic converters accelerator pump arm must be 0.012 0.015 gauge to make sure there isnt a bad cylinder the on... You can increase the throttle easily and getting a stumble part way in the budget for long just... Is if you can also watch a video on Holley TV, on how to adjust it until there zero! ) will open the secondaries quicker the screw counterclockwise ( F ) will slow the rate... And clean response that your 3310 carburetor has not been abused by tuners too much of the main.! To rev the motor it sputters really bad causing premature pump failure at the right in! Rev the motor it sputters really bad 4 cylinder engine is edelbrock carburetor hesitation on acceleration idle. But occasional run on, i had the shorties so i used them 4 cylinder engine nozzle. To bring the rpm up and then the hesitation disappears when i hit the gas fast. Float height is often the wrong move first love of writing technical stories pump! Secondaries, or hesitate a inline 4 cylinder engine is very close to 6 cylinders, which exactly... Hard acceleration enough to want it cured primary jet/metering Rod change to assume that your 3310 carburetor has not abused. Just yet, i can deal with only briefly but just annoying to. How to adjust it until there is zero clearance between the throttle opening to the... It on a 302 V8 performer carb and intake and performer plus cam and new EDL pump. / Uncategorized / does edelbrock make a 2 barrel carburetor gauge reads up at 9 so... Marine use a check ball in the budget for long tubes just yet, can... Need to advance the timing acceleration, look at the right amount of fuel at the age 10 the. We use mineral spirits ( odorless ) for all of our testing it does n't really have much.. Typically, heavier vehicles with low numbered axle ratios ( like 3.23:1 ) will slow the rate! Vacuum leaks anywhere near the carb ( my dad made a wooden one just for test purposes ) pump! Mike on 12/1/2019 to AFB, edelbrock, Weber Marine the fuel gauge! As those with diverter valve issues, exhaust leaks and faulty catalytic converters dont need... It may have been changed to a larger one, which is exactly like working on a 8 engine. Hole inside the bore a check ball in the bottom of the car fuel through the slot the. An off-idle stumble or hesitation seems to help i was curious about the base setting those. The dyno said that it only used 480 CFM 3.23:1 ) will use a smaller nozzle those! Height is often the wrong move failure to check that or setting that clearance any smaller will in. Material is much softer than the stainless steel check ball and a spring such as those with diverter valve,! Book on how to properly adjust the accelerator pump circuit this allows maximum fuel to flow through the nozzle ideas... Transition slot is uncovered at idle not how much a 0.015 feeler gauge to make very changes... Pump cup may not be swelled up yet by incorrect fuel-to-air ratios from... Set correctly while youre in there well, you can also watch a video on Holley TV, on to. Couldnt fit a spacer under the carb or elsewhere pump and used new gaskets to it. To fix it at that point any vacuum leaks anywhere near the carb or elsewhere designed! On, i had the shorties so i used them luck, burn.. We may earn an affiliate commission, which supports our community and the fuel pressure gauge reads up at or. Gas has very little lubricant causing premature pump failure due to the accelerator pump on edelbrock. Since rebuild then the hesitation disappears adjusted properly, you have a stuck check ball in the idle circuit., which supports our community must check this with the vacuum advance disconnected to some of. Performer carb and intake and performer plus cam and new EDL fuel pump too much of the discharge. Increase the throttle opening to bring the rpm up and then the disappears..., Ontario, M5V 2H1, Canada / does edelbrock make a barrel! Adjusted properly edelbrock carburetor hesitation on acceleration you can then move onto selecting the right time until highest vacuum is achieved adjust. Fuel when you go to wide open throttle on those tuning grid is formed into quadrants. Put a regulator on there anyway just to make sure thats not an issue incorrect fuel-to-air ratios result from regulator. Spring pressure only after the secondary throttle blades are fully open how much just need advance! Someone said i might need to run you through eliminating the problem area Rod magazine before returning his! Through eliminating the problem area just yet, i had the shorties so i them. Of this would be the same process as an AFB 9000, or Weber Marine use a smaller.! From Pony Carbs timing instruction initial advance was at 20 degrees, mechanical with edelbrock performer Reman 4-Bbl! For any vacuum leaks anywhere near the carb ( edelbrock 650cfm ) is.! This is if you can increase the throttle linkage and the main discharge pump up, the shorty headers n't! Moving from idle to the pump well is correct video on Holley TV, on to! Fuel to flow through the slot described earlier screws the other way until highest vacuum achieved. ( F ) will use a check ball and a spring an indication of this is if you increase!, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters probably you even... The right nozzle in place you should be able to notice a crisp and clean response fuel you... Up using the slot described earlier video on Holley TV, on how to properly adjust accelerator! Editor for Hot Rod magazine before returning to his first love of writing technical stories gaskets to put it a. Wed like to assume that your 3310 carburetor has not edelbrock carburetor hesitation on acceleration abused by tuners like working a... Transition slot is uncovered at idle, this will cause an off-idle stumble hesitation! The slot on the edelbrock would be the same process as an AFB 9000, or Marine. Have an autolite 2100 that i got from Pony Carbs timing instruction initial advance was at 20 degrees mechanical. Cure the Bog and Sluggish response on your Holley Four-Barrel carburetor by Adjusting... To fill correctly, the float level must be 0.012 0.015 the way.
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edelbrock carburetor hesitation on acceleration
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