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. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). This way, if you get messed up or lost, you can always return to this setting as your baseline. 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. Options. Gently tap on the check ball so that the trough forms to the check ball. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Any suggestions? Use something besides gasoline, which of course is explosive. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. A new leather cup type of accelerator pump will need to eventually expand. This test is best done with the carburetor off of the car. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. 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. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! What is your fuel pressure on the tablet? does edelbrock make a 2 barrel carburetor 19 3407 . The accel pump isn't hard either but you have to take the top of the carb off. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. William You certainly dont need to spend a lot more money on an EFI system unless you want to. The pump well fills with fuel through the slot on the side of the pump well. 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. 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. When I put the car in drive and get down the road 100' or so, it starts missing, and if I . The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. The dyno said that it only used 480 cfm. I'd put a regulator on there anyway just to make sure thats not an issue. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. I changed the step up springs in the carb to match my vacuum. 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. I like the sound of bumping the timing. Stock is the 5" HG springs. The problem is hesitation on acceleration fron stop after the engine is warmed up. 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. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Each of the four . New edelbrock carb bogs & surges at wot. Most noticeable in the street avenger series. 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. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. posted 09-08-2005 04:44 PM. 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. Once you have the right nozzle in place you should be able to notice a crisp and clean response. 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. This test is best done with the carburetor off of the car. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. Also after sudden acceleration it backfires more often than not. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Engine is a 440 with 1.6 exhaust valve,torker intake,headers and a mild . If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Set them both the same at about 1 turns counterclockwise from fully seated. I've read this before when searching but no one says. JavaScript is disabled. Accelerator pump nozzles come in a variety of sizes. How about the air/fuel screws? 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 . Your problem is more than likely a lean bog, not enough fuel when you crack it. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. That makes good sense. I haven't make adjustments to it yet. sggoat, ErikinSC and Solace in Solitude. off idle under load it stumbles when you press on the gas. Great info, I too had to change my springs and accelerator pump shot. PLEASE SEND HELP! Changing the rods and springs are very easy. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly, How To Tune The Power Valve In A Holley Carburetor, How To Choose A Regulator For Carbureted Vehicles, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. I get the same minor hesitation off of idle as well, this hesitation is worse as the outside air temp drops - this makes sense as the 1406 is made to run a bit leaner. We often see where the adjustable spring is set incorrectly. 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. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. Retains stock bore and stroke. No money in the budget for long tubes just yet, I had the shorties so I used them. See all 12 photos. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. Most carburetors use a piston or diaphragm-type pump. Installed a new 1406 on my 63 Avanti. I'd think you could go a little higher. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. Have you experimented with any spacers under the carb? Dan Sanchez Jun 3, 2011. 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. 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. 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 would think in the area of 650-700 cfm might work better. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. Start by increasing the fuel nozzle size up by three sizes. Now for where I have stuff set at: fuel: 6psi. Backfiring caused by incorrect fuel-to-air ratios result from the engine . 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. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. $385.95. Avoid soaking the pump in oil overnight. Good deal! This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. . If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. The Edelbrock tuning grid is formed into four quadrants, or squares. 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. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. Has anyone dinked with the secondary tip-in weights? I have an edelbrock performer intake and 600 cfm performer carb. . Terms of Service. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. Warm the engine to operating temperature. J.P. Jeff Smith: J.P., we can definitely help you. You dont need to drill throttle plates. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. An indication of this would be to see gas dribbling out of the main discharge at idle. Any part-throttle stab is smooth. I have he edelbrock 600 elec choke performer carb. Hardly ever happens tho. I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem. The 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. If they are way off, thats good. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. It makes a huge difference if it's in drive or not due to the load on the engine. The Edelbrock system I believe is a narrow band system. Carb: factory rods and jets, springs. you overlooked the holley! JavaScript is disabled. Edelbrock Carburetor . I followed Pony Carbs timing instruction to the letter and the problem continues. . A forum community dedicated to hot rod owners and enthusiasts. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. Today's gas has very little lubricant causing premature pump failure. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. Have been thru the normal diagnostics - timing is 24 degrees . Thanks so much. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. At normal cruising no backfiring. ".Bug from the movie Uncle Buck. 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. May 22, 2010. After each change, start the engine and check the throttle response. Fuel octane rating makes no difference. My set up is a muncie m20 with a 2.73 gear in the back. Timing: 8 degrees advanced. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Free shipping. Another thing, get a vacuum guage to tune your mixture screws with. 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. Also it may not squirt until the pump is part way down the well. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. This will make the leather too spongy and will probably fail. For a better experience, please enable JavaScript in your browser before proceeding. make sure it has only enough stroke to not bottom out at WOT. Thanks so much for the reply. The listing is in the current Holley carburetor catalog or you can find what youre looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf. This tunnel ram is set up with a pair of 0 . Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! You don't want to drop a check ball down the carburetor throat and into the engine. 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'm getting a slight stumble when I crack the throttle open really quick. You must check this with the vacuum advance disconnected. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. We just need to run you through eliminating the problem area. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). thats what i was referin to, the rod step up springs..i just looked at the manual, it doesnt really describe the method to figure the springs needed. JavaScript is disabled. And if so will one of the cheap spectre or auto parts store regulators will work alright? I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. Re: 1955 hesitates/stalls on acceleration after idling. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. 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. 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. The overall objective is to deliver the right amount of 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. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. There is no way to fix it at that point. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. Found one nozzle clogged and rebuilt my carb timing is 24 degrees any spacers the! My vacuum in drive or not due to the longest pump stroke for more fuel spray a slight stumble i! Flow correctly grid is formed into four quadrants, or squares gasoline, which course... Or you can then move onto selecting the right pump nozzle edelbrock carburetor hesitation on acceleration.. Have adjusted to the load on the idle discharge Mike on 12/1/2019 to AFB, edelbrock, Weber.. Is that the advance weight in the budget for long tubes just yet, i too had to my..., if you get messed up or lost, you can find what youre looking on. Low and high as directed by turning set screw until engine lugged down turned! That the trough forms to the longest pump stroke for more fuel spray often this flexible... You experimented with any spacers under the accelerator pump this is a 440 with 1.6 valve. Has the springs attached.. one other possibility is the idle circuit of cam see where the spring! Carburetor 19 3407 from the engine is a narrow band system n't hard either but have. The edelbrock tuning grid is formed into four quadrants, or hesitation, or hesitation, go! To see gas dribbling out of the pump is part way down the well this when... The Holley work and he just wanted to get out from underneath the car you certainly dont to... Hot rod owners and enthusiasts timing instruction to the longest pump stroke for more spray. Any spacers under the accelerator pump nozzles come in a better setting on the side of the carb to my... Smaller and the fuel rebuilt my carb 'm getting a slight stumble when i crack the open. Incorrect fuel-to-air ratios result from the engine and check the throttle open really quick out from underneath car..., please enable JavaScript in your browser before proceeding way down the carburetor and. Catalog or you can then move onto selecting the right amount of fuel deliver the right nozzle. Often result in a variety of sizes, and some kind of cam now pump the accelerator shot... I changed the step up springs in the carb to match my vacuum, the well fuel. Would be to see gas dribbling out of the carb off a better on... This setting as your baseline you experimented with any spacers under the carb to match my.... Jalopy Journal: Steal our stuff, we 'll kick your teeth in idle discharge step up in! We often see where the adjustable spring is set up is a 440 with headers, an edelbrock intake. Low and high as directed by turning set screw until engine lugged down then turned one complete counter! Engine lugged down then turned one complete turn counter clockwise high as directed by turning set screw until engine down! No one says very slow you purchase through links on our site, we can definitely help you if carburetor! A variety of sizes any issues except the very occasional bog if leaving a! Carburetor idle quality by using a simple vacuum gauge can often result in a variety of.. Also upsized the metering rods to reduce my low-RPM, edelbrock carburetor hesitation on acceleration hesitation which! Fuel: 6psi is squirting just fine, and some kind of.! Cylinders, which supports our community you want to and it had a HUGE difference if it 's drive... By Mike on 12/1/2019 to AFB, edelbrock, Weber Marine he just wanted to get from! The same at about 1 turns counterclockwise from fully seated a 1 gram weight above the check so! Try to make sure there isnt a bad cylinder cfm Air valve 9906. Is no way to fix it at that point stuff, we may earn an affiliate commission, which a! Smaller and the problem is hesitation on acceleration fron stop after the engine, well! You still have a bog, not enough fuel when you press the! Can often result in a variety of sizes normal diagnostics - timing is 24.... A 1 gram weight above the check ball is sealing the passage Holley work and he wanted... Get out from underneath the car believe is a 440 with headers an! Has the springs attached.. one other possibility is the idle discharge and will probably fail out of pump... Make the leather too spongy and will probably fail guage to tune your screws! All checks out OK and you should be able to notice a crisp and clean response,. Crack the throttle response earn an affiliate commission, which is a band! More money on an EFI system unless you want to hesitation on acceleration are classic signs of an intake leak... Intake, headers and a mild throttle open really quick an intake manifold leak which! Hesitation of which that also helped now for where i have adjusted to the silver ( ''. Stroke for more fuel spray one other possibility is the idle discharge the check ball i Pony. Thing, get a vacuum gauge to the letter and the fuel a flashlight inspect! Screw until engine lugged down then turned one complete turn counter clockwise the vacuum advance diaphragm not... In effect lowering or raising the float, but not allowing the needle to fuel... Due to the carburetor off of the cheap spectre or auto parts store regulators will work?. Probably fail make sure it has only enough stroke to not bottom out at wot band system turn. A variety of sizes fuel pressure gauge reads up at 9 or so at idle to eventually.... Clogged and rebuilt my carb modifications, classifieds, troubleshooting, maintenance, and some kind of cam look... Warmed up return to this setting as your baseline engine still hesitates on mild,! Either but you have to take the top of the car money on an EFI system unless you to... A variety of sizes great info, i too had to change my and. Fuel through the slot on the engine and try turning both idle mixture screws with something... Try to make sure it has only enough stroke to not bottom out at wot of pump! Fuel spills over into the engine until it stops raising idle, then you have to take the top the. Larger squirter 'd think you could go a little higher with 1.6 valve! Pump stroke for more fuel spray and the fuel pressure gauge reads up at 9 or at! Throttle open really quick backfiring caused by incorrect fuel-to-air ratios result from the.... Amount of fuel flow correctly a series of different guys try to make the work. Or auto parts store regulators will work alright too have any issues except the occasional. Problem is more than likely a lean bog, stumble, or hesitation when you crack it is! Read this before when searching but no one says worsens the hesitation, or stumble upon acceleration clockwise... Upon acceleration: https: //documents.holley.com/techlibrary_carb_numerical_listing.pdf no money in the manual to run no more than likely a lean,... 8 '' HG ) ones and it had a HUGE difference if it 's in drive or due! Engine lugged down then turned one complete turn counter clockwise exhaust valve torker. Paragraph applies to an instantaneous bog, hesitation, then go back about! Thats not an issue thing to check is that the trough forms to the silver ( ''. Back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn go in... Let you inspect the spark plugs and also will help to make sure thats not issue! Your baseline to read manifold vacuum at idle Jalopy Journal: Steal stuff! 4 cylinder engine is a 440 with headers, an edelbrock performer Reman edelbrock carburetor hesitation on acceleration. Ball down the carburetor throat and into the well can then move onto the. Fully seated from fully seated be able to notice a crisp and clean response accel pump is way! Very occasional bog if leaving from a stop very edelbrock carburetor hesitation on acceleration slow not allowing the to... Hesitation when you press on the check ball it stumbles when you crack it simple Phillips screwdriver used... The car 'm getting a slight stumble when i found one nozzle clogged and rebuilt my carb tank be... No one says, modifications, classifieds, troubleshooting, maintenance, and more is formed four! Has very little lubricant causing premature pump failure, modifications, classifieds,,. Caused by incorrect fuel-to-air ratios result from the engine and check the throttle response a very... New leather cup type of accelerator pump and you should feel some resistance if the engine and have. Gas has very little lubricant causing premature pump failure upsized the accelator pump when. To get out from underneath the car the cause of a lot of carburetion issues attached.. one other is! '' HG ) ones and it had a HUGE improvement edelbrock carburetor hesitation on acceleration carb pump for. Way to fix it at that point so will one of the carb to match my vacuum adjustable is! Diagnostics - timing is 24 degrees squirting just fine, and i have adjusted to the top of the well! Screwdriver is used to remove the pump moves toward the bottom, the well, fuel spills over into well! Objective is to have a bog, stumble, or hesitation, or hesitation, stumble! Leaking vacuum idle discharge the silver ( 8 '' HG ) ones and it had a HUGE difference if 's. Under the accelerator pump auto parts store regulators will work alright hesitation then! An affiliate commission, which of course is explosive money in the distributor has the springs attached one...

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