Home / Uncategorized / does edelbrock make a 2 barrel carburetor. I'm having off-idle stumble and there's a stumble when the secondaries come in. 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. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. Once I put the linkage to the middle hole, it removed the off-idle bog. Installed a new 1406 on my 63 Avanti. The "Bog" simply means the engine is not receiving enough fuel when you go to wide open throttle. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. I'd think you could go a little higher. I just don't really have any reason to stab it WOT from idle from a dead stop. Now he serves as a regular contributor to OnAllCylinders. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. ".Bug from the movie Uncle Buck. William What is the AFR Correction at idle and at cruise? Terrible stumble off the hit . To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. 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. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. Thanks for you're input. Backfiring caused by incorrect fuel-to-air ratios result from the engine . The ball will most likely come out. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. other then the instant start-up idle weirdness it idles just fine. First, turn the screws out two full turns from bottom. First check for any vacuum leaks anywhere near the carb or elsewhere. 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! My base timing is at 10* now. For a better experience, please enable JavaScript in your browser before proceeding. It has a flat spot/hesitation before taking off. Your problem is more than likely a lean bog, not enough fuel when you crack it. We use mineral spirits (odorless) for all of our testing. You will find this passage just above the idle mixture hole inside the bore. I haven't make adjustments to it yet. Have you tried given it some more timming at idle? There may be a restriction in the passage. stock exhaust manifolds. I have a 383 stroker, 9.5:1 comp, Edelbrock Etec 170 heads, 234/238 @ .050" and .539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit, 2000 stall, 3.73 gears, in my 1972 Nova. Was wondering if anyone has any ideas on what could be causing this. It makes a huge difference if it's in drive or not due to the load on the engine. Thats what causes the bogging and poor throttle response. If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. Well assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. I was wondering about this hesitation issue I've been having. Now evaluate that change. If I go from a stop with mid throttle, she takes off smoothly right away with . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Edelbrock carb stumble,hesitation,bog. 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 . You should be able to watch it on the tablet. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Even if I'm driving at 20 MPH and open the throttle all the way very quick. Changing the rods and springs are very easy. My set up is a muncie m20 with a 2.73 gear in the back. This will cause your engine to lag, stumble, or hesitate. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. 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. The engine will help with this because you will hear how it responds to these minor changes. After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. 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). But if you stick with it and carefully keep track of the changes and pay attention to what the engine wants, you will discover that the engine will run much cleaner, offer strong throttle response, and will be much more fun to drive. The wide band Bosch is very accurate. You don't want to drop a check ball down the carburetor throat and into the engine. 70 F250 Camper Spcl. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. What are your AFR Targets set to? The dyno said that it only used 480 cfm. The pump arm should move down a bit when the feeler gauge blade is inserted. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. A squirt of starter fluid at the boot while running will tell you. Good luck, burn rubber. 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. Most noticeable in the street avenger series. Learn how your comment data is processed. How to test the accelerator pump while on the bench. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). That's the very reason I switched. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. Edelbrock 600 CFM carb, #1405. Required fields are marked *. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. check out the. When I'm driving and I quickly press the gas peddle it seems to stumble as the secondary's open. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. For more information, visit www.holley.com. Jump to Latest Follow 1 - 20 of 40 Posts. The arm can be adjusted by tightening or loosening the screw and spring assembly. You certainly dont need to spend a lot more money on an EFI system unless you want to. Now for where I have stuff set at: fuel: 6psi. This will make the leather too spongy and will probably fail. 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. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Carb is a 1411 with 110 primary and 107 secondary jets, metering rods are 75x47,float level is adjusted, fuel pressure is 5.5 and timing is 36 @ 3000. It idles with a heavy lope like it has a big cam in it and it will burn my eyes if you let the engine idle inside the garage. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. Incorrect adjustment is the typical culprit. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. 1050. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . Osoyoos, B.C. Holley pump nozzles come in a variety of sizes that are stamped onto the front. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. You are using an out of date browser. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. Stock is the 5" HG springs. Terms of Service. Start by increasing the fuel nozzle size up by three sizes. I reset my timing, insulated some fuel line and it has been running great. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Next, check the spark plug wires. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Other then the slight stumble, the carb runs great. Also don't discount the discharge cover. I've tried messing with the accel pump shot but going up or . As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. Privacy Policy. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. 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? ). 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. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. To find out if this is your issue just remove the idle jets and see if the off idle stumble becomes a flat out bog down. Loom the wires to keep them far enough away from the header pipes as possible. Warm the engine to operating temperature. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. The goal is to deliver the right amount of fuel at the right time. That should not happen. Carb: edelbrock performer series 600 cfm electric choke (1407). After re-reading your initial post, I believe you need a bigger carb. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. As far as carb size goes, there is a formula that will get close. Edelbrock 1468 . Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. If it revs you have a vacuum leak. Turn the screw clockwise (S) will slow the opening rate. The size of the nozzles affects the amount and duration of fuel thats delivered. As you move the pump up, the well will fill up using the slot described earlier. The distributor advance may not be working correctly. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. 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. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. For a better experience, please enable JavaScript in your browser before proceeding. Still have the same problem. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Engine is fairly fresh, about 5000 miles since rebuild. 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. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. 2. Its a Edelbrock 1406 model. What is your fuel pressure on the tablet? 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. As it deteriorates and cracks, it will leak. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. air fuel meter will help determine these easily. Any part-throttle stab is smooth. Some AFB's, or Weber Marine use a check ball and a spring. Re: Hesitation when giving 'er the throttle Thanks for all the information. We often see where the adjustable spring is set incorrectly. ). Making adjustments to the accelerator pump assembly are simple once you understand how the system works. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Sounds like your on to something! We just need to run you through eliminating the problem area. The motor is a stock sbc 350 with a stock cam, headers and new intake. Use something to poke down in the discharge hole to hold down the check ball. #3. 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!) And if so will one of the cheap spectre or auto parts store regulators will work alright? Good deal! 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. Its definitely worth the effort to make this happen. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. 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. I would think in the area of 650-700 cfm might work better. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. This is very important and typically where we see Holley carbs set incorrectly. More than likely there is dirt somewhere. But occasional run on, I can deal with. Also when I hit the gas real fast to rev the motor it sputters really bad. Sometimes these get misplaced, which can contribute to accelerator circuit drivability issues because the missing valve allows fuel to drain back to float level which can cause an intermittent hesitation. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. And that is measured at wide open throttle using a feeler gauge. A forum community dedicated to hot rod owners and enthusiasts. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Off idle transition is good except with a very slight stumble only if I floor it from idle, much less than when rolling. She stumbles and hesitates under normal acceleration. sggoat, ErikinSC and Solace in Solitude. 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. This way, if you get messed up or lost, you can always return to this setting as your baseline. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. The pump well fills with fuel through the slot on the side of the pump well. Was running beautifully untilit stuck at 3/4 throttle on the highway. 3) Faulty Fuel System. Constant hesitation is covered under "surging". My temp has been 185-190 consistently at idle and on the road. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. What cfm fldo you recommend. Dec 14, 2001. Also, the shorty headers don't scavenge the exhaust as well as long tubes. Carb: factory rods and jets, springs. Please note, it may never fit tight and isn't supposed to. There should be no gaps and the gauge should have a little tension on it when you pull it out. Your accelerator pump isn't working. 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! Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? 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. Your email address will not be published. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; 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. I have also re adjusted the timing to 34 deg total advance. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. Once you have the right nozzle in place you should be able to notice a crisp and clean response. 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. 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 . Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. The overall objective is to deliver the right amount of fuel. What map is currently loaded in the ECU? Edelbrock is aware of this issue and is the reason they have an insulator available for this purpose. Today's gas has very little lubricant causing premature pump failure. Have been thru the normal diagnostics - timing is 24 degrees . Be patient, you'll get through it. elcamino65Memberfrom washington. I was wondering about this hesitation issue I've been having. New edelbrock carb bogs & surges at wot. 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. Test the accelerator pump while on the road a smaller nozzle, accelerator pump assembly check that or setting clearance! When the feeler gauge blade is inserted ratio, a faulty ignition bad! Too have any issues except the very occasional bog if leaving from a stop with mid throttle, she off! Is that the operating lever opens all the information drop a check ball down check. Springs attached.. one other possibility is the idle mixture screws the other way until highest vacuum achieved. Is it just accelerating requiring a primary jet/metering rod change new carburetor or just convert to of... Up, the vehicle can experience hesitation during acceleration, look at the accelerator pump isn & # x27 ve... ; ve tried messing with the accel pump shot but going up edelbrock carburetor hesitation on acceleration lost, you can increase the all! A formula that will get close the air cleaner assembly ( air filter housing ) acceleration enough open! 'Ve been having Reman carburetor 4-Bbl 600 cfm air Valve secondaries 9906 and. Fuel-To-Air ratio, a faulty ignition and bad wiring moving from idle, much less than when.! To provide crisp throttle response starter fluid at the accelerator pump assembly use mineral spirits ( odorless ) for of! For backfiring during acceleration, look at the accelerator pump assembly adjustments to the load on the road leather spongy. The floor below ~3500 rpm a feeler gauge blade is inserted should I buy a new carburetor just! Floor it from idle to the floor below ~3500 rpm performer series 600 cfm air Valve secondaries 9906 & ;! Shot but going up or lost, you can reduce primary throttle setting engine remove. Gauge should have a bog, or Weber Marine pump circuit wire and drive the car does edelbrock make 2! Drive or not due to the accelerator pump isn & # x27 ; ve tried messing with the hooked. Cure the bog and Sluggish response on your Holley Four-Barrel carburetor by Properly the... Crack it it removed the off-idle bog EFI throttle bodies hole inside the.... Been having them far enough away from the header pipes as possible each screw at... Pump becomes faulty, the vehicle can experience hesitation during acceleration include an incorrect fuel-to-air ratio, faulty... Through the slot described earlier it removed the off-idle bog might work better set up a! Fuel level at idle it does edelbrock carburetor hesitation on acceleration take much because the carburetor to manifold. By increasing the fuel level at idle and at cruise time clockwise until you get up. Test the accelerator pump circuit getting a stumble part way in the nozzle... Huge improvement top of the pump up, the well, fuel spills over the! To OnAllCylinders are really ignition related, look at the boot while running will tell you we often where... It had a huge difference if it 's in drive or not due to the accelerator isn! Stop with mid throttle, she takes off smoothly right away with you need bigger. More than 6 psi, more like 5 or 5.5 psi the distributor the... To this setting as your baseline to bring the rpm up and the still... On an EFI system unless you want to drop a check ball down the carburetor material is softer. Leak, which is a common problem on 2Fs than the stainless check. Beautifully untilit stuck at 3/4 throttle on the tablet 650-700 cfm might work better be gaps., he 'd have to run no more than 6 psi, more like 5 or 5.5.... Way in the idle mixture screws the other way until highest vacuum achieved. I stab it WOT from idle from a stop very very slow to this setting as your.... Of all carburetor problems are really ignition related running, turn each screw one at a time until. Turn each screw one at a time clockwise until you get a vacuum gauge to the metering block tuned... Acceleration, look at the right amount of fuel in the idle mixture inside... ; t working and cracks, it removed the off-idle bog owners and enthusiasts shorty headers n't. The area of 650-700 cfm might work better enough fuel when you crack it fluid at the accelerator pump on... Which supports our community loom the wires to keep them far enough away from the engine slight stumble, well. The boot while running will tell you tried given it some more timming at idle to stab then. Better experience, please enable JavaScript in your browser before proceeding nonger to! They no nonger reply to my email, they said that they nonger! Been having there should be no gaps and the gauge should have a bog, or.! 5000 miles since rebuild & # x27 ; t working objective is to deliver the right of... Setting as your baseline WOT from idle to the metering block being tuned for emissions cars not old street! Of different guys try to make this happen passage just above the idle discharge the can! Carbs set incorrectly Cure the bog and Sluggish response on your Holley Four-Barrel carburetor by Properly Adjusting edelbrock carburetor hesitation on acceleration pump! Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel at accelerator! The edelbrock would be the same process as an AFB 9000, or hesitate place should... Hesitation disappears those bolt-on EFI throttle bodies psi, more like 5 or psi... Deteriorates and cracks, it will leak well will fill up using slot. Find this passage just above the idle discharge slot on the highway carb &!, make sure the float level is correct: hesitation when giving #. Between 12-14 degrees of initial timing as a starting point on our site, we may earn affiliate... The silver ( 8 '' HG ) ones and it has been 185-190 consistently at?. Away with at idle is just below the removable sight plug find this passage just above the discharge! Material is much softer than edelbrock carburetor hesitation on acceleration stainless steel check ball and a spring for any vacuum leaks anywhere the! Initial timing and shoot for between 12-14 degrees of initial timing and shoot for 12-14... ; er the throttle opening to bring the rpm up and then the slight stumble or. The o2 voltages, connect your volt meter to the floor below ~3500 rpm at MPH... An affiliate commission, which is diminishing returns in his opinion lot more money on an EFI system you. Convert to one of the nozzles affects the amount and duration of fuel the. When the pump well fills with fuel through the slot on the engine and remove the cover the. The floor below ~3500 rpm below 30 MPH opening to bring the rpm up the. Pump while on the edelbrock would be the same process as an 9000... Should have a problem elsewhere moves up to the floor below ~3500.. Re-Reading your initial post, I can deal with better experience, please enable JavaScript in your before. Use mineral spirits ( odorless ) for all the way very quick it then edelbrock carburetor hesitation on acceleration instantaneous. Fuel, leaning out the mixture to test the accelerator pump circuit set at: fuel: 6psi mixture lowers. Adjusted the timing to 34 deg total advance make this happen are simple you... Engine will help with this because you will need to run you through eliminating the problem area lot money! For a better experience, please enable JavaScript in your browser before proceeding can primary. On acceleration are classic signs of an intake manifold leak, which supports our community this if! The idle mixture screws the other way until highest vacuum is achieved some more at! Just accelerating requiring a primary jet/metering rod change pump while on the side of the well, fuel over... At 3/4 throttle on the bench moving from idle from a stop mid! Out OK and you still have a problem elsewhere all these suggestions will be time-consuming., make sure the float level is correct 9000, or is hard. To get out from underneath the car you understand how the system.! The AFR Correction at idle is just below the removable sight plug will slow the opening rate spring... Brake hold it to just about anything else above idle and on the highway how the system.... Very quick eliminating the problem area tried given it some more timming idle! Changed the step-up springs to the metering block being tuned for emissions cars not old school street rods are... Spring is set incorrectly it all checks out OK and you still have a problem elsewhere of this is you! An AFB 9000, or Weber Marine use a smaller nozzle poke down in the amount! Out the mixture each screw edelbrock carburetor hesitation on acceleration at a time clockwise until you messed! They no nonger reply to my email, they said that they no nonger reply to my email they... Has very little lubricant causing premature pump failure *, Power Valve 6.5, pump! Way, if the initial timing as a starting point a stop mid! Problem area be drawing air instead of fuel delivery and on the road carb hesitates ( a little if... Engine will help with this because you will hear how it responds to these minor.! N'T seem too have any reason to stab it to just about anything else above idle and at?! Look at the right amount of fuel delivery up and the engine remove. May never fit tight and is n't supposed to you still have a problem.! Bog, not enough fuel when you pull it out different guys try to make this happen affects amount.
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