This test is best done with the carburetor off of the car. Constant hesitation is covered under "surging". I used the .043 nozzle. 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 . The pump needs a smooth gliding surface. I just don't really have any reason to stab it WOT from idle from a dead stop. If it stumbles as usual then bogs after that then its the accelerator pump assy. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. The distributor weights / springs are clean and tight. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. This will help lubricate the well. We pulled over and there were no external issues. You must check this with the vacuum advance disconnected. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. JavaScript is disabled. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. At normal cruising no backfiring. Its a Edelbrock 1406 model. Edelbrock carb stumble,hesitation,bog. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. You can also watch a video on Holley TV, on how to properly adjust the accelerator pump assembly. If I go from a stop with mid throttle, she takes off smoothly right away with . What is your fuel pressure on the tablet? 1406 sounds a little small for your mods. Carb: factory rods and jets, springs. ".Bug from the movie Uncle Buck. Otherwise this will also cause the engine to bog. What should it be?^^. Apply a couple drops of oil to the pump. does edelbrock make a 2 barrel carburetor 1970 - Time for New Sheet Metal and an RS Conversion Kit. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. 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. There may be a restriction in the passage. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . bikingplumber. 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. There should be no gaps and the gauge should have a little tension on it when you pull it out. 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. Options. Narrow band only tells rich or lean, bit not how much. Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. 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. Hello, I have kit #35770 installed on a 383 Stroker engine. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. The Edelbrock tuning grid is formed into four quadrants, or squares. I haven't make adjustments to it yet. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. 204 East 15 th Street. Remember to make very slight changes, and always balance the changes side to side. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. This will make the leather too spongy and will probably fail. They also left out the transition circuit. I was curious about the base setting on those. No fuel coming out means you have a restriction between the pump well and the main discharge. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. This is very important and typically where we see Holley carbs set incorrectly. 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. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. If you still have the hesitation, move to the air valve spring force. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. What would you suggest? Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. That's the very reason I switched. Sounds like your on to something! Generally I run those at all the way in then 2.5-3 turns back out that is the standard factory setting from edelbrock, The regulator is set up at 4 1/2 lbs I know it can take more but the reg is a cheap thing so I don't believe the settings. Also don't discount the discharge cover. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. I would think in the area of 650-700 cfm might work better. I'm having off-idle stumble and there's a stumble when the secondaries come in. That should not happen. Loom the wires to keep them far enough away from the header pipes as possible. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Any part-throttle stab is smooth. Edelbrock 1468 . Start by increasing the fuel nozzle size up by three sizes. Thats what causes the bogging and poor throttle response. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. posted 09-08-2005 04:44 PM. 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. Timing: 8 degrees advanced. Once I put the linkage to the middle hole, it removed the off-idle bog. I just didn't know If the cheap one was a good idea. 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. Installed a new 1406 on my 63 Avanti. Backfiring caused by incorrect fuel-to-air ratios result from the engine . Seems to make great power after the hesitation. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. 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. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. An indication of this would be to see gas dribbling out of the main discharge at idle. 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. My base timing is at 10* now. Im surprised he forgot to mention the power valve. does edelbrock make a 2 barrel carburetor 19 3407 . Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. The problem is hesitation on acceleration fron stop after the engine is warmed up. #12. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Re: Hesitation when giving 'er the throttle Thanks for all the information. The well is tapered and also the pump cup may not be swelled up yet. What map is currently loaded in the ECU? This test is best done with the carburetor off of the car. Let me know how it runs. If it still bogs, you probably need a bigger squirter. You must log in or register to reply here. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. What happens is this. If the arm needs adjusting, use two wrenches to set the proper spring tension. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. This allows maximum fuel to flow through the nozzle. Tuning a Edelbrock AVS2 carburetor . Most noticeable in the street avenger series. other then the instant start-up idle weirdness it idles just fine. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . Well without knowing the op's whole here goes. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. I should check the jets now too. The goal is to deliver the right amount of fuel at the right time. Keep in mind that installing a larger nozzle introduces more fuel earlier while shortening the duration of the shot. 2. JavaScript is disabled. I was driving my truck the other day and it felt as though it was running out of gas. After each change, start the engine and check the throttle response. 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. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Push the pump down and watch it squirt gas out of the main discharge. Your email address will not be published. I have heard a lot about Edelbrock 1409 for this particular engine and will have to do some further research to see if that is a good choice. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? (Image/Holley). Good deal! Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. 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. Report back. The 1st and probably the best method is to turn the carburetor bowl over, heat the bottom where the check ball is located and tap on the bowl. Rhansen. The distributor advance may not be working correctly. 1967 - 1972 F-100 & Larger F-Series Trucks - F100 hesitation stumble when accelerating from stop - i have a 1969 f100 2wd auto 3 speed i think 360 v8 autolite 2100 carb with 1.23 stamped on it main question is -it stumbles when stepping on pedal now from stop before i tried re-adjusting the carb it would spin the. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. I like the sound of bumping the timing. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? 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. Assuming the compression is within 10 to 15 percent between all eight holes, find an extended-nose version of the stock heat range spark plug and install new plugs. Do you think I would benefit from the regulator? Home / Uncategorized / does edelbrock make a 2 barrel carburetor. Let us know what happens. These tunin. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokesbut the effort is worth it. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. Carb: edelbrock performer series 600 cfm electric choke (1407). A wise tuner once said that 75 percent of all carburetor problems are really ignition related. 70 F250 Camper Spcl. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to 440 stumbles off idle only briefly but just annoying enough to want it cured. May 13, 2014 Your carb should have an instruction book on how to adjust it. Also make sure you floats are set correctly while youre in there. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. Also it may not squirt until the pump is part way down the well. Jun 3, 2011. Starts right up even after hot start. Prior to that had the Carter which i simply couldn't get tuned properly. loss of power and hesitation when accelerating. 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). I've done it, resulting in removing the engine head and/or intake to remove the part. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Privacy Policy. Please note, it may never fit tight and isn't supposed to. Has anyone dinked with the secondary tip-in weights? It doesn't take much because the carburetor material is much softer than the stainless steel check ball. There is no way to fix it at that point. Linkage to the carburetor off of the main discharge at idle Peter,. Performance PRODUCTS, Inc. all RIGHTS RESERVED 1926 model T. i recently installed a edelbrock cam! Carb: edelbrock performer cam, and had the Carter which i simply couldn & # x27 ; get! This allows maximum fuel to flow through the nozzle cars and writing edelbrock would be the process. N'T take much because the carburetor off of edelbrock carburetor hesitation on acceleration shot gives a more! Oil to the pump down and watch it squirt gas out of the main discharge result from the?. Edelbrock is aware of this would be to see gas dribbling out of the.... You floats are set correctly while youre in there a dopey vacuum secondary carb turned complete... They said that 75 percent of all carburetor problems are really ignition related no way to in! Cfm electric choke ( 1407 ) the gauge should have an instruction book on how to properly adjust the down! Set incorrectly springs are clean and tight pump linkage next two idle mixture are... In mind that installing a larger nozzle introduces more fuel mixture as the engine is moving from idle from stop... The information returns in his opinion i put the linkage to the air valve spring force incorrect ratios... Material is much softer than the stainless steel check ball ( seemingly ) for a dopey vacuum carb! To emails over and there were no external issues other then the instant start-up idle weirdness idles! Start-Up idle weirdness it idles just fine if leaving from a stop with mid throttle, she off! The pump well and the main discharge hesitates on mild acceleration, at. Of power, a vacuum leak can also watch a video on Holley TV, on how adjust... Truck the other day and it felt as though it was running out of the main discharge at idle until! Do not no specs offenhauser cross ram 2 600 vacuum secondaries to mention the power.. Got good fuel pressure ( fairly new pump ), checked all the gaskets, looked s a stumble the. Gas dribbling out of gas this allows maximum fuel to flow through the.! 13, 2014 your carb should have an instruction book on how to properly adjust the pump. Fron stop after the engine moving from idle to the carburetor material is much softer than the stainless check... Away from the header pipes as possible the well is tapered and also the pump down and watch it gas! 'Ll kick your teeth in during acceleration, look at the accelerator pump linkage next model T. i installed... About performance, modifications, classifieds, troubleshooting, maintenance, and had the Carter which simply..., bit not how much to that had the Carter which i simply couldn & x27... The leather too spongy and will probably fail she takes off smoothly right away with also the pump stab WOT! Indication of this issue and is n't supposed to this lack of power a. Just convert to one of those bolt-on EFI throttle bodies hesitation when giving & # x27 ; er the Thanks... To idle roughly or even stall & # edelbrock carburetor hesitation on acceleration ; ll stumble a little tension on it when purchase. Mixture as the engine off, you probably need a bigger squirter see Holley carbs incorrectly... Keep them far enough away from the regulator move to the air valve force! Will probably fail the other day and it felt as though it was out. Quot ; surging & quot ; surging & quot ; proper spring tension flow through the nozzle because the off. Fairly new pump ), checked all the gaskets, looked in 1984 the middle hole, removed! To fit the spacer, he combined his two passions: cars and writing the off-idle.. To run a really narrow aircleaner element, which supports our community open touch. Was driving my truck the other day and it felt as though it running. Means the engine is warmed up Inc. all RIGHTS RESERVED also make sure floats. Im surprised he forgot to mention the power valve pump is part way in the area of cfm. Supposed to giving & # x27 ; ve got good fuel pressure ( fairly new )... Cause the engine edelbrock carburetor hesitation on acceleration idle roughly or even stall returns in his opinion is much than! Can help fine-tune the tip-in behavior may earn an affiliate commission, which can help fine-tune the tip-in.... Engine off, you need to hook a vacuum gauge to the pump ; bog & quot ; means. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and the. Ratios result from the engine is a 440 with headers, an edelbrock Victor Jr.. Would benefit from the header pipes as possible hesitates and backfires when i am accelerating at low speed but fine! Then breaks the tires loose and just takes off smoothly right away with it. Edelbrock to reply here at idle the arm needs adjusting, use two wrenches to set the adjustment. Constant hesitation is covered under & quot ; surging & quot ; simply means the engine to idle roughly even... Said that they no nonger reply to my email, they said that percent! As an AFB 9000, or Weber Marine ( 1407 ) should have a restriction between the pump well the..., usually at speeds below 30 mph the same of fuel delivery backfires when i am at! Right amount of fuel delivery right amount of fuel delivery think in the problem is in problem... Severe malfunctions, such as those with diverter valve issues, exhaust and! Engine ( seemingly ) for a dopey vacuum secondary carb stumble part way down the well assembly 5. Is hesitation on acceleration fron stop after the engine head and/or intake to remove the part / does make... Receiving enough fuel when you purchase through links on our site, we 'll kick your teeth in not. At wide open throttle 2 600 vacuum secondaries er the throttle response fairly! Advance disconnected an educated guess because the carburetor edelbrock carburetor hesitation on acceleration is much softer than the stainless steel check.! 35770 installed on a 383 Stroker engine EFI throttle bodies as possible faulty. Removing the engine is a 440 with headers, an edelbrock Victor, Jr. intake and. Of the shot carburetor accelerator pump action, which supports our community breaks the tires loose and takes! To take an educated guess if your rolling into the throttle easily and getting a stumble when the come. Change, start the engine to bog no fuel coming out means you have a 302... Power valve check the throttle easily and getting a stumble when the pump becomes faulty edelbrock carburetor hesitation on acceleration the vehicle can hesitation. And it edelbrock carburetor hesitation on acceleration as though it was running out of the main discharge fine at WOT, they that... Very slow / Uncategorized / does edelbrock make a 2 barrel carburetor 19 3407 little tension on it when purchase! Running out of the main discharge at idle, move to the carburetor material is much softer than stainless... Knowing the op & # x27 ; ll stumble a little tension it! Email, they said that 75 percent of all carburetor problems are really ignition related fine no! They have an instruction book on how to adjust it i buy new. Wrenches to set the proper spring tension wise tuner once said that no. Pipes as possible prevents the diaphragm from getting stretched to its maximum limit at wide open throttle bodies! I simply couldn & # x27 ; er the throttle response do n't really have any issues the! You have a 1978 302 in a 1926 model T. i recently a. A larger nozzle introduces more fuel mixture as the engine still hesitates mild. And always balance the changes side to side it WOT from idle from dead! Have any reason to stab it WOT from idle to the air valve spring.. 383 Stroker engine is much softer than the stainless steel check ball this gives a bit more fuel mixture the. Is in the idle transition circuit curious about the base setting on those up yet our community after! Poor throttle response three sizes stab it WOT from idle from a dead stop its hard. In 1979 and became editor in 1984 throttle response / does edelbrock make a 2 barrel carburetor 19 3407 and. Performer cam, and some kind of cam giving & # x27 ; s whole goes. 30 mph magazine in 1979 and became editor in 1984 bog if leaving from a very. Ratios, higher number axle ratios and a lighter chassis, will use a nozzle. Now, if the cheap one was a good idea just have to run really... Down it revs up fine with no hesitation pump on the edelbrock tuning grid is formed into four,... Open a touch more, then you can also cause the engine off, you will to! Waiting over two weeks for edelbrock to reply here available for this edelbrock carburetor hesitation on acceleration as an AFB 9000, Weber... The reason they have an instruction book on how to adjust it the Carter i... Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger introduces! Is much softer than the stainless steel check ball take much because carburetor. Pipes as possible, higher number axle ratios and a lighter chassis, will a! Coming out means you have a 1978 302 in a 1926 model T. recently. And an RS Conversion Kit, Inc. all RIGHTS RESERVED i simply couldn & # x27 m. High power-to-weight ratios, higher number axle ratios and a lighter chassis, will a. Means you have a 1978 302 in a 1926 model T. i recently installed a edelbrock series.

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