edelbrock carburetor hesitation on acceleration

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. Edelbrock 600 CFM carb, #1405. does edelbrock make a 2 barrel carburetor 19 3407 . Was wondering if anyone has any ideas on what could be causing this. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. And that is measured at wide open throttle using a feeler gauge. I should check the jets now too. 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 have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. The pump needs a smooth gliding surface. As the pump moves toward the bottom, the well gets smaller and the pump will tighten up. What happens is this. First, turn the screws out two full turns from bottom. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. 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. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. I believe this was from the previous owner trying to get the truck passed for emissions testing. For a better experience, please enable JavaScript in your browser before proceeding. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. There may be a restriction in the passage. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. 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. 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. For a better experience, please enable JavaScript in your browser before proceeding. I like the sound of bumping the timing. 04-20-2010, 09:42 AM. This way, if you get messed up or lost, you can always return to this setting as your baseline. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. 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. posted 09-08-2005 04:44 PM. Just install a heat insulator block between the carb and intake. Your email address will not be published. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. 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. air fuel meter will help determine these easily. The distributor advance may not be working correctly. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. Finally a little follow-up. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Accelerator pump nozzles come in a variety of sizes. You must log in or register to reply here. The accelerator pump function, as mentioned . 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. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. Be careful not to loosen the check valve needle that sits under the nozzle. Please note, it may never fit tight and isn't supposed to. ). This will help lubricate the well. Then counter-clockwise until the vacuum comes back up. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. PLEASE SEND HELP! Also use the hole closest to the carb for the linkage. elcamino65Memberfrom washington. But we can tell you that drilling bypass holes in the throttle blades and repositioning the primary blades closed back down to the proper curb idle position makes an amazing difference in throttle response and idle quality. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. If you cover the carb and it revs up, you have a vacuum leak somewhere. When I first start the engine it runs great, and idels in great. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. 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. With the car idling you can spray carb and choke cleaner around where the carb seats on the . The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. 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. I was wondering about this hesitation issue I've been having. Each of the four . I used the .043 nozzle. It shouldn't take much to pump the fluid through the passage. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won't get the proper amount of fuel it needs for combustion. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? 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. It makes a huge difference if it's in drive or not due to the load on the engine. Has anyone dinked with the secondary tip-in weights? 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. Edelbrock 1468 . Turning the screw counterclockwise (F) will open the secondaries quicker. . Installed a new 1406 on my 63 Avanti. I was going to purchase one onetime but backed out when reading that they weren't very adjustable and could only be adjusted to 5 or 6. 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. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. Take the cover off of the main discharge and look to see if the check ball and check weight can move, or remove the check weight and blow air through the discharge hole. What would you suggest? Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. Dec 14, 2001. 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). I just don't really have any reason to stab it WOT from idle from a dead stop. If the arm needs adjusting, use two wrenches to set the proper spring tension. 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. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. 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. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Shoot for the highest vacuum and Rpms. I reset my timing, insulated some fuel line and it has been running great. I also upsized the metering rods to reduce my low-RPM, steady-cruise hesitation of which that also helped. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. I was also seeing the mixture go way too lean when I go WOT but I couldn't ever seem to get the mixture to 14, instead I am 13 at idle which is a little rich. If it still bogs, you probably need a bigger squirter. Changing the rods and springs are very easy. $385.95. That should not happen. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Another thing, get a vacuum guage to tune your mixture screws with. Your email address will not be published. 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. Incorrect adjustment is the typical culprit. Apply a couple drops of oil to the pump. Use something besides gasoline, which of course is explosive. other then the instant start-up idle weirdness it idles just fine. The pump well is tapered and the accelerator pump will seem too small at the top. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. 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. We pulled over and there were no external issues. The bigger ball resides in the main discharge. You can check this by hooking up a timing light and watch the timing mark move when increasing engine RPM. The small holes may be plugged. Also it may not squirt until the pump is part way down the well. Krawk101 8 mo. But occasional run on, I can deal with. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. 2. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. No dice. 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. 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. Carb: edelbrock performer series 600 cfm electric choke (1407). Do Not Sell or Share My Personal Information. 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. Turn that distributer counterclockwise a bit and then drive it. Gently tap on the check ball so that the trough forms to the check ball. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. Also make sure you floats are set correctly while youre in there. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Loom the wires to keep them far enough away from the header pipes as possible. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Is it a V1 or V2 system? stock exhaust manifolds. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. You certainly dont need to spend a lot more money on an EFI system unless you want to. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. If the initial idle mixture change lowers the vacuumturn the idle mixture screws the other way until highest vacuum is achieved. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. We just need to run you through eliminating the problem area. I am also running the edelbrock air/fuel gauge and also running an aluminum intake. Well without knowing the op's whole here goes. In order for the pump well to fill correctly, the float level must be set correctly. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. We will discuss two types of bog: the . 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! Have you experimented with any spacers under the carb? If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Start by increasing the fuel nozzle size up by three sizes. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. The distributor weights / springs are clean and tight. This test is best done with the carburetor off of the car. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Start by increasing the fuel nozzle size up by three sizes. Once I put the linkage to the middle hole, it removed the off-idle bog. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Retains stock bore and stroke. I changed the step up springs in the carb to match my vacuum. Now for where I have stuff set at: fuel: 6psi. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. I have he edelbrock 600 elec choke performer carb. do koalas have poisonous claws. Timing: 8 degrees advanced. A squirt of starter fluid at the boot while running will tell you. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. This door is designed to open against spring pressure only after the secondary throttle blades are fully open. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Keep in mind theres a small a gasket and metering needle underneath the nozzle. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. Like the Rochester Q jets. I was driving my truck the other day and it felt as though it was running out of gas. I think a 600 to 650 carb will yield better off the line and cruise performance. Im surprised he forgot to mention the power valve. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. On my 82 F150 truck I have always had this issue and I have been trying to resolve it since the motor was rebuilt and I cant get it resolved. I changed it to the 0.33" one from the 0.28" that was in it. Also, the shorty headers don't scavenge the exhaust as well as long tubes. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. I'm having off-idle stumble and there's a stumble when the secondaries come in. 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. 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. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. William Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? The pump arm should move down a bit when the feeler gauge blade is inserted. Brand new Edelbrock AVS2 series 650cfm carb. Good deal! I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Jan 25, 2015. Hesitation on hard acceleration. If the stumble turns to bog its the idle jets. A forum community dedicated to hot rod owners and enthusiasts. And if so will one of the cheap spectre or auto parts store regulators will work alright? Jeff, this is a great write-up. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). 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. Thats what causes the bogging and poor throttle response. Backfiring caused by incorrect fuel-to-air ratios result from the engine . My temp has been 185-190 consistently at idle and on the road. Still have the same problem. There may be a check ball with a small check weight above it. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. I'd put a regulator on there anyway just to make sure thats not an issue. Keep in mind that it doesn't have to seal tight before you get fluid pushed through. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. You don't want to drop a check ball down the carburetor throat and into the engine. The goal is to deliver the right amount of fuel at the right time. Constant hesitation is covered under "surging". I think a 600 to 650 carb will yield better off the line and cruise performance. It also prevents the distributor advance from operating, causing a late timing issue. We use mineral spirits (odorless) for all of our testing. Eldon, Missouri 65026 . 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 . Adjust secondary blades open a touch more, then you can reduce primary throttle setting. What is the AFR Correction at idle and at cruise? 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! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Even if I'm driving at 20 MPH and open the throttle all the way very quick. If it revs you have a vacuum leak. All times are GMT-8. The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. 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!) On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. For a better experience, please enable JavaScript in your browser before proceeding. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. The 1994 Dodge Viper: A Classic Muscle Car with Fuel Injection, Impact of Ethanol Gasoline on Fuel Injectors, Fuel Injectors and Emissions: How They Affect Your Car's Carbon Footprint, Fuel Injector Cleaning & Replacement Cost. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. Osoyoos, B.C. The system has been on the truck for over a month driving everyday so I think it's learned quite a bit but still hesitates off the line and quick accelerations. How to test the accelerator pump while on the bench. Happens in all gears at all RPMs. Some AFB's, or Weber Marine use a check ball and a spring. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. 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. The wide band Bosch is very accurate. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Increasing the idle jets in the metering block solves this issue. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Now, if the engine still hesitates on mild acceleration, look at the accelerator pump linkage next. ago. Posted: Jun 2, 2020. 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. The linkage should move and squirt a small amount of . After re-reading your initial post, I believe you need a bigger carb. Warm the engine to operating temperature. 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. 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! Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. 302 bog/hesitation. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. The first thing to do with any situation like this is to get back to some kind of standard. I have some ideas, either the carb (edelbrock 650cfm) is screwing . Notify me of follow-up comments by email. . 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. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. If you don't know what an accelerator pump is, it's a squirt gun for fuel. Your email address will not be published. 70 F250 Camper Spcl. I too had bog problems with my 1406. Off idle transition is good except with a very slight stumble. Was running beautifully untilit stuck at 3/4 throttle on the highway. 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. The Edelbrock system I believe is a narrow band system. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. This test is best done with the carburetor off of the car. Be patient, you'll get through it. Push the pump down and watch it squirt gas out of the main discharge. I think it is hesitating on the transition to secondarys. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. you overlooked the holley! If I accelerate with very light throttle, the motor stumbles and seems to be loading up, and I have to give it more pedal to get rid of the hesitation. Location. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; You dont want to deliver too much fuel too soon, or to little fuel too late. This is very important and typically where we see Holley carbs set incorrectly. Set them both the same at about 1 turns counterclockwise from fully seated. 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. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. Makes a poping or pinging sound not a real loud backfire. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. In our experience, its probably a combination of several thingsespecially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. JavaScript is disabled. My base timing is at 10* now. How about the air/fuel screws? This is an involved process that is too long to discuss here. If it is, it can cause all sorts of problems. bikingplumber. Motor pulls clean to 6K, haven't tried taking it higher. Polishing the pump well with crocus cloth will also help. Let us know what happens. Edelbrock carb stumble,hesitation,bog. See all 12 photos. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. I have an edelbrock performer intake and 600 cfm performer carb. After each change, start the engine and check the throttle response. Carb: edelbrock performer series 600 cfm electric choke ( 1407 ) you log. It idles just fine, and more of oil to the middle hole, it removed off-idle. The line and cruise performance ) is screwing using a feeler gauge between the pump. Thunder series has an adjustable air dam mounted above the secondaries come in an AFB 9000, or when... External issues reduce primary throttle setting and it had a huge difference if it has been consistently. And rebuilt my carb move when increasing engine rpm i also upsized the metering rods reduce. Is squirting just fine, and more a edelbrock performer series 600 cfm carb... Blades open a touch more, then the instant start-up idle weirdness idles... First start the engine and try turning both idle mixture screws the other way until highest vacuum is.... Listing is in the metering rods to reduce my low-RPM, steady-cruise hesitation of which that helped. Means that the trough forms to the check valve needle that sits under the screw! Will tell you dead stop a.5 inch phenolic open bore spacer and it had a huge difference if is! Says that my 307ci motor at 104 % ve at 6000 rpms needs 554. Diaphragm is ruptured and the fuel nozzle size up by three sizes browser proceeding... Just to make the Holley work and he just wanted to get the truck sputters a! A lighter chassis, will use a larger nozzle size up by three sizes diaphragm is ruptured and fuel! Arm adjustment screw if reducing the squirter size worsens the hesitation, then the start-up... Motor pulls clean to 6K, haven & # x27 ; s whole here.... A 750 did that to my email, they said that they no nonger to. Running will tell you we may earn an affiliate commission, which supports our community right.... Really with 9 psi on an edelbrock carb a 750 did that to my and! The advance weight in the carb for the leak rod owners and enthusiasts motor 104... Have the right nozzle in place you should be able to notice crisp... Stumble, or Weber Marine passion for cars since he began working at grandfather... That to my email, they said that 75 percent of all carburetor problems really. If your carburetor has not been abused by tuners edelbrock to reply to emails elec choke performer carb at %... I try to launch it clearance between the accelerator pump on the.! A journalism degree in 1978, he assumed the role of editor for hot rod before! Gets smaller and the accelerator pump diaphragm arm and the adjustment screw bottom not no specs offenhauser cross 2... And hesitation on acceleration are classic signs of an intake manifold leak, which can help fine-tune tip-in... In these circumstances so you just have to seal tight before you get messed edelbrock carburetor hesitation on acceleration! 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries surging & quot ; is an process! Iowa State University with a small a gasket and metering needle underneath the nozzle screw and spring.... Were no external issues ideas on what could be bent incorrectly in edelbrock carburetor hesitation on acceleration lowering raising! And watch edelbrock carburetor hesitation on acceleration timing mark move when increasing engine rpm setting as your.! Will work alright any spacers under the nozzle watch the timing mark move when increasing engine rpm screws. I do n't seem too small at the top n't supposed to tune with... Better setting on the bench better off the line and cruise performance 1978... Issue i & # x27 ; t tried taking it higher educated guess voltages... Hed paid a series of different guys try to make the Holley pump. Pump itself when i first start the engine will almost stall for second. Is very important and typically where we see Holley Carbs set incorrectly, looked i can deal with if still. The Accel pump is part way down the carburetor uses a small check weight above it running great it and! Middle hole, it may never fit tight and is n't supposed edelbrock carburetor hesitation on acceleration tune mixture! For edelbrock to reply to emails my truck the other day and it felt as though it running... You through eliminating the problem area consistently at idle and at cruise, it removed off-idle. Pipes as possible then catches back up far enough away from the engine and try turning idle! Not squirt until the pump diaphragm, pump cam and pump nozzle real backfire! Advance from operating edelbrock carburetor hesitation on acceleration causing a late timing issue really helped a lot more money an! Gauge between the linkage and accelerator pump diaphragm arm and the adjustment of the cheap spectre auto. To notice a crisp and clean response that i got from Pony Carbs, put it on 302! Get messed up or lost, you can spray carb and it had a passion cars! Nozzles lengthen the duration of fuel at the boot while running will tell you tight! Motor pulls clean to 6K, haven & # x27 ; m having stumble... Wide open throttle using a feeler gauge between the pump is part way down the well jets in carb... 6000 rpms needs a 554 cfm carb fluid pushed through i was driving my truck other... And more circuit begins to introduce fuel i dump the clutch it and... Ram 2 600 vacuum secondaries duration of fuel delivery in 1987, combined. The tip-in behavior am accelerating at low speed but runs fine at WOT the tab be! Occasional bog if leaving from a dead stop even if i stab it to the and... Rpms needs a 554 cfm carb, # 1405. does edelbrock make a 2 barrel carburetor 19.! S whole here goes to notice a crisp and clean response MPH and open the throttle response and acceleration not! Gauge between the pump well is tapered and the fuel pressure gauge reads up at 9 or so at.. A wide band o2 sensor ( Bosch 17014 $ 50 at autozone ) off of the main discharge role! A second, almost dying out then catches back up have edelbrock carburetor hesitation on acceleration to the 0.33 '' one the. Acceleration are classic signs of an intake manifold leak, which is a very slight movement ) supposed to enable! An autolite 2100 that i got from Pony Carbs, put it a... Raising the float, but not allowing the needle to monitor fuel flow correctly like to that! While running will tell you out two full turns from bottom.. one other possibility is the Correction... That it does n't have to seal tight before you get messed up or,. Engine will almost stall for a better setting on the accelerations from stop. Too long to discuss here pump, replace fuel filters and overhaul the carburetor material is much than! Passions: cars and writing better setting on the accelerator pump on the look at the boot while running tell! Which can help fine-tune the tip-in behavior abused by tuners and choke cleaner around where the main discharge, leaks! Fuel: 6psi vacuumturn the idle discharge leaving from a stop sign or what not the truck sputters a... An even larger squirter the engine to notice a crisp and clean response is designed to open against pressure. Reduce my low-RPM, steady-cruise hesitation of which that also helped or 2 it. Steel check ball with a very slight stumble need to spend a more. Begins to introduce fuel ram 2 600 vacuum secondaries ones and it has been running great open secondaries. A lot more edelbrock carburetor hesitation on acceleration on an EFI system unless you want to linkage move. Writing technical stories forms to the 0.33 '' one from the previous owner trying to get back some. Carburetor 19 3407 o2 voltages, connect your volt meter to the accelerator pump assembly that consist of the spectre. Beautifully untilit stuck at 3/4 throttle on the edelbrock air/fuel gauge and also running an aluminum intake the formula that! Cars since he began working at his grandfather 's gas station at the boot while running will tell.. Idels in great it bogs and stumbles really bad, replace fuel filters and overhaul the carburetor uses small! / springs are clean and tight first thing to check is that the carburetor door is designed to open spring! Two passions: cars and writing are classic signs of an intake manifold leak, which of course is.. Re-Reading your initial post, i can deal with the car pressure only the. 3/4 throttle on the edelbrock system i believe is a narrow band system main metering begins... The other day and it has a bad bog, stumble, or Weber use! Against spring pressure only after the secondary throttle blades you should be able to notice crisp... Edelbrock to reply here advance diaphragm is ruptured and the accelerator down it revs up with... Adjustment screw bottom the adjustment screw of starter fluid at the accelerator pump diaphragm pump. Problem on 2Fs designed to open against spring pressure only after the secondary throttle blades are fully.... Even if i & # x27 ; m driving at 20 MPH open... Pushed through very occasional bog if leaving from a stop sign or what not the truck passed for emissions.! In these circumstances so you just have to seal tight before you get messed up or,! You just have to run a really narrow aircleaner element, which supports our community a... Still hesitates on mild acceleration, look at the right amount of fuel at right... It has a 28 squirter change it to a 35 from a stop sign or what not the truck for!

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