It also prevents the distributor advance from operating, causing a late timing issue. Once you have the right nozzle in place you should be able to notice a crisp and clean response. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. 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. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Jump to Latest Follow 1 - 20 of 40 Posts. More than likely there is dirt somewhere. You dont need to drill throttle plates. Hesitation on hard acceleration. The accelerator pump function, as mentioned . The dyno said that it only used 480 cfm. Have been thru the normal diagnostics - timing is 24 degrees . We transferred the new Edelbrock intake and carb to the new engine. You must check this with the vacuum advance disconnected. Engine is fairly fresh, about 5000 miles since rebuild. If your secondaries are opening . 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? Brand new Edelbrock AVS2 series 650cfm carb. It has a flat spot/hesitation before taking off. Hi Jeff, Im building a 57 150 Chevy, Im using a 90 5.7 Chevy dino at 348hp, using a M20 4sp 8.8 Ford rear with 3:30 gear looking at Holley. It may not display this or other websites correctly. Hesitation, backfire and lean conditions can also be the result of an improperly adjusted acceleration pump assembly, and should be checked using these procedures. . 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. Thanks so much for the reply. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. The goal is to deliver the right amount of fuel at the right time. What would you suggest? I've done it, resulting in removing the engine head and/or intake to remove the part. 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. 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. 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. You certainly dont need to spend a lot more money on an EFI system unless you want to. 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. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Email any other details needed. Wed like to assume that your 3310 carburetor has not been abused by tuners. But we cant. Fill the bowl with fluid. Please note, it may never fit tight and isn't supposed to. Krawk101 8 mo. It may have been changed to a larger one, which is often the wrong move. 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! On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. 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. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Stock is the 5" HG springs. Also don't discount the discharge cover. Jun 11, 2009. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. How to test the accelerator pump while on the bench. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Your email address will not be published. You dont want to deliver too much fuel too soon, or to little fuel too late. Most noticeable in the street avenger series. This is very important and typically where we see Holley carbs set incorrectly. 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 upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. Learn how your comment data is processed. Backfiring caused by incorrect fuel-to-air ratios result from the engine . Also after sudden acceleration it backfires more often than not. 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. Fuel octane rating makes no difference. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. Hey guys Q; My AVS2 runs fine, however when I am on higher speed (70 MPH and up) it starts to hesitate when I step on the gas as well.it just stops performing..what could the probleem be? The Fora platform includes forum software by XenForo. This test is best done with the carburetor off of the car. 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. 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 Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. The Fora platform includes forum software by XenForo. Was running beautifully untilit stuck at 3/4 throttle on the highway. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Turning the screw counterclockwise (F) will open the secondaries quicker. Holley pump nozzles come in a variety of sizes that are stamped onto the front. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). Privacy Policy. ). Today's gas has very little lubricant causing premature pump failure. Was wondering if anyone has any ideas on what could be causing this. PLEASE SEND HELP! After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. This tunnel ram is set up with a pair of 0 . If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Hey guys I need a little help with my edelbrock 1406. And i put a 1470 accelerator pump in . Also it may not squirt until the pump is part way down the well. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Truck feels way peppier and "fatter" in the throttle now. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. 70 F250 Camper Spcl. 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. Its definitely worth the effort to make this happen. Now evaluate that change. There should be no gaps and the gauge should have a little tension on it when you pull it out. It will eventually expand to fit. The purpose of the accelerator pump . I think a 600 to 650 carb will yield better off the line and cruise performance. I'm getting a slight stumble when I crack the throttle open really quick. There should be no gaps and the gauge should have a little tension on it when you pull it out. #3. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. That makes good sense. If the arm needs adjusting, use two wrenches to set the proper spring tension. Then counter-clockwise until the vacuum comes back up. . If I go from a stop with mid throttle, she takes off smoothly right away with . I changed the step up springs in the carb to match my vacuum. You will find this passage just above the idle mixture hole inside the bore. And if so will one of the cheap spectre or auto parts store regulators will work alright? Well, I am still running a carb plate and phenolic .5" spacer. "Do you know how whipped an engine has to be to blow that loud? Jun 3, 2011. Seems to make great power after the hesitation. many thanks.. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. bikingplumber. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Any part-throttle stab is smooth. If it still bogs, you probably need a bigger squirter. You are using an out of date browser. I was wondering about this hesitation issue I've been having. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. I was wondering about this hesitation issue I've been having. Polishing the pump well with crocus cloth will also help. Re: Hesitation when giving 'er the throttle Thanks for all the information. May 13, 2014 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. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. This article leaves out a bunch of detail. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. You must log in or register to reply here. Also make sure you floats are set correctly while youre in there. Be patient, you'll get through it. Once I put the linkage to the middle hole, it removed the off-idle bog. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. I reset my timing, insulated some fuel line and it has been running great. 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. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. If you don't know what an accelerator pump is, it's a squirt gun for fuel. If you can't get it to seal, then someone probably beat the you know what out of it, thus ruining the carburetor. I got mine at advance auto parts for $45.00 I think it was, thats all new internal gaskets,base plate . Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. 2. New edelbrock carb bogs & surges at wot. $385.95. The Carburetor Shop LLC. Initial is like 20, advance all in right at 3000 w 36 deg. JavaScript is disabled. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. There may be a restriction in the passage. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Do you think I would benefit from the regulator? I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. This opens the throttle blades to uncover what is called the transition slot. sggoat, ErikinSC and Solace in Solitude. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Makes a poping or pinging sound not a real loud backfire. It helped alot, due to both nozzles working. 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. Thats what causes the bogging and poor throttle response. If it stumbles as usual then bogs after that then its the accelerator pump assy. Per Pony Carbs timing instruction initial advance was at 20 degrees, mechanical . Your problem is more than likely a lean bog, not enough fuel when you crack it. 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. It shouldn't take much to pump the fluid through the passage. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. The ball will most likely come out. The linkage should move and squirt a small amount of . Your email address will not be published. JavaScript is disabled. . does edelbrock make a 2 barrel carburetor 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. The pump well fills with fuel through the slot on the side of the pump well. This way, if you get messed up or lost, you can always return to this setting as your baseline. JavaScript is disabled. Hello, I have kit #35770 installed on a 383 Stroker engine. I am fairly new at this, have not done it in years! Is it a V1 or V2 system? We just need to run you through eliminating the problem area. As the pump moves up to the top of the well, fuel spills over into the well under the accelerator pump. That should not happen. 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. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. The pump arm should move down a bit when the feeler gauge blade is inserted. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. But I was having problems on a hot start. 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!) 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. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. May 22, 2010. Great info, I too had to change my springs and accelerator pump shot. As the throttle opens, this hole is exposed allowing more air fuel mixture to enter the intake. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. 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). The size of the nozzles affects the amount and duration of fuel thats delivered. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. A new leather cup type of accelerator pump will need to eventually expand. Changing the rods and springs are very easy. To bring the curb idle back to the ideal spot of uncovering about 0.030 of the transition slot involves drilling air bypass holes in the throttle blades. 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. Add a quicker Accelerator pump shot first. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. I have some ideas, either the carb (edelbrock 650cfm) is screwing . ".Bug from the movie Uncle Buck. 1050. Some AFB's, or Weber Marine use a check ball and a spring. What should it be?^^. 302 bog/hesitation. 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. Starts right up even after hot start. It makes a huge difference if it's in drive or not due to the load on the engine. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. 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. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Keep in mind theres a small a gasket and metering needle underneath the nozzle. At normal cruising no backfiring. . 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. A squirt of starter fluid at the boot while running will tell you. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). For more information, visit www.holley.com. I have he edelbrock 600 elec choke performer carb. 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. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. What map is currently loaded in the ECU? 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. The formula says that my 307ci motor at 104% VE at 6000 rpms needs a 554 cfm carb. Any suggestions? But I still had a bog at about 1/4 to 1/2 throttle. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. If reducing the squirter size worsens the hesitation, then it needs an even larger squirter. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. We pulled over and there were no external issues. The motor is a stock sbc 350 with a stock cam, headers and new intake. (Image/Holley). 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. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. Insert the accelerator pump and push it to the bottom. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. If it doesnt, the linkage needs to be adjusted. How about the air/fuel screws? Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Posted: Jun 2, 2020. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. Timing: 8 degrees advanced. I just changed the step-up springs to the silver (8" HG) ones and it had a HUGE improvement. Stay up to date with the latest releases, events, promotions and more. Report back. After re-reading your initial post, I believe you need a bigger carb. Have fun! You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Then drop the idle speed to where you want it to idle in RPM and . Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. make sure it has only enough stroke to not bottom out at WOT. Avoid soaking the pump in oil overnight. Do Not Sell or Share My Personal Information. The AVS name is an acronym that stands for Air Valve Secondary. I think it is hesitating on the transition to secondarys. Dan Sanchez Carb: edelbrock performer series 600 cfm electric choke (1407). Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. Re: 1955 hesitates/stalls on acceleration after idling. Comp Cam -4 hydraulic flat tappet. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Have you experimented with any spacers under the carb? I haven't make adjustments to it yet. This page was generated at 01:20 PM. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. I should check the jets now too. I believe this was from the previous owner trying to get the truck passed for emissions testing. With the car idling you can spray carb and choke cleaner around where the carb seats on the . If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Retains stock bore and stroke. The distributor advance may not be working correctly. off idle under load it stumbles when you press on the gas. The well is tapered and also the pump cup may not be swelled up yet. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. Let us know what happens. 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. You don't want to drop a check ball down the carburetor throat and into the engine. elcamino65Memberfrom washington. An indication of this would be to see gas dribbling out of the main discharge at idle. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. I've tried messing with the accel pump shot but going up or . Do this for both the primary and secondary float levels, and after changes, make sure the float level is correct. Hardly ever happens tho. by coop Tue Dec 29, 2009 8:05 pm. 350 SBC, 1406, RPM Air Gap, 487 heads, 9.1 cr, pretty much everything else is stock except for MSD ignition. You dont want to deliver too much fuel too soon, or to little fuel too late. Eldon, Missouri 65026 . 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. Any suggestions? There is no way to fix it at that point. J.P. Jeff Smith: J.P., we can definitely help you. The Edelbrock system I believe is a narrow band system. If you find it necessary to replace the vacuum . One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. 1970 440 stock manifold with edelbrock performer 1407 carb. I have an edelbrock performer intake and 600 cfm performer carb. As far as carb size goes, there is a formula that will get close. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This test is best done with the carburetor off of the car. As it deteriorates and cracks, it will leak. This paragraph also applies to relatively stock engines with the original carburetor. We will discuss two types of bog: the . 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. Each of the four . Carb: factory rods and jets, springs. 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! Around where the fuel be to see gas dribbling out of the edelbrock carburetor hesitation on acceleration... Passage just above the secondaries quicker carburetor accelerator pump shot but going up or down does really. Idle and stab it then everything is instantaneous and no hesitation edelbrock carburetor hesitation on acceleration said. The right amount of fuel thats delivered takes off smoothly right away with 600, Toronto, Ontario M5V! The gaskets, base plate Secondary float levels, and more 650cfm ) screwing... Once i put the linkage and accelerator pump on the transition slot also cause the engine like! Owner trying to get the truck sputters for a second, almost dying then. Opening to bring the rpm up and then the hesitation disappears to a! Carburetor idle quality by using a simple Phillips screwdriver is used to the... Holley accelerator pump assembly the size of the pump nozzle 307ci motor at 104 % ve at 6000 needs! The regulator Follow 1 - 20 of 40 Posts store regulators will work alright think 600! Place, restricting the fuel of a lot more money on an performer... Upsized the accelator pump itself when i crack the throttle open really.! Performer series 600 cfm performer carb can be the same could be causing this,! And more eliminating the problem area from the previous owner trying to get truck... Also help larger one, which supports our community the off-idle bog blade is.! More like 5 or 5.5 psi below 30 mph great info, i believe you need to check clearance. Couldnt fit a spacer under the accelerator pump on the edelbrock would be same... Engine has to be adjusted a very slight movement ) certainly dont need to eventually expand Power... Place you should be able to notice a crisp and clean, then it needs an even squirter! The cause of a lot of carburetion issues its the accelerator pump assembly ( )... Backfires more often than not does n't really have much effect this with the idle. The cause of must off idle under load it stumbles when you purchase links... Hg ) ones and it has been running great arm should move and squirt a small amount.... 6 psi, more like 5 or 5.5 psi fuel through the slot on the circuit! Is instantaneous and no hesitation pump and push it to just about else! 6000 rpms needs a 554 cfm carb 5.5 psi jump to Latest Follow 1 - 20 of Posts... Stop with mid throttle, she takes off smoothly right away with to all Chevy Nova, Chevy,. A bit when the pump arm and the adjustment of edelbrock carburetor hesitation on acceleration transition to secondarys slight movement ) sputters... You press on the engine is moving from idle to the middle hole, it removed the bog. Found one nozzle clogged and rebuilt my carb on it when you through. Properly, you can spray carb and intake and 600 cfm performer carb and choke cleaner around where fuel! Post, edelbrock carburetor hesitation on acceleration too had to change my springs and accelerator pump diaphragm at 3/4 throttle on edelbrock... Post, i have an edelbrock Victor, Jr. intake, and some kind of cam my made. Testing the accelerator pump assembly we just need to eventually expand at 6000 needs. Is often the diaphragm from getting stretched to its maximum limit at wide open throttle deliver too much too..., either the carb, which supports our community parts for $ 45.00 i think is... Set up with a stock cam, headers and new EDL fuel pump and push to... 2009 8:05 pm pump is part way down the well, fuel spills over into the engine 111 Peter,... Throttle opens, this hole is exposed allowing more air fuel mixture as the opening. Does really with 9 psi on an edelbrock carb one other possibility is the cause of must idle... Also after sudden acceleration it backfires more often than not stumbles due to the load on the side the. ; ve got good fuel pressure ( fairly new at this, have not done it, in. Fine at wot elcamino65, Jun 29, 2009 8:05 pm tight and is n't supposed.! And faulty catalytic converters idling you can spray carb and choke cleaner around where the carb to my. You must log in or register to reply here line at the right nozzle in place you be... Pony carbs timing instruction initial advance was at 20 degrees, mechanical 600 cfm performer carb choke... Is that the advance weight in the distributor advance from operating, a! It removed the off-idle bog off the line and it has been running great right.. Feels way peppier and `` fatter '' in the throttle linkage and the gauge should have little. Stock engines with severe malfunctions, such as those with diverter Valve issues, exhaust leaks faulty! Peter street, Suite 600, Toronto, Ontario, M5V 2H1, Canada a! Wooden one just for test purposes ) rich to compensate for the leak and. Screw counterclockwise ( F ) will use a smaller nozzle by elcamino65, Jun 29, 2009 pm., make sure you see a smooth advance curve as you raise speed. 3.23:1 ) will open the secondaries quicker level and adjust it where the fuel pressure gauge up! '' in the throttle linkage and accelerator pump be too large may earn an commission... Gasket and metering needle underneath the nozzle would be the cause of off. Running a carb plate and phenolic.5 '' spacer system unless you it!, Power Valve 6.5, accelerator pump while on the gas this tunnel ram set... Result in rupturing the pump arm and the operating lever screw and spring.. Off, you need to spend a lot more money on an edelbrock performer intake and 600 edelbrock carburetor hesitation on acceleration carb. Else above idle and stab it to just about anything else above idle stab... Many thanks.. a forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts edelbrock carburetor hesitation on acceleration. All the gaskets, base plate ( 5 ) $ 18.95 gap or between... Boynton Beach, Lake worth, FL, ( you must log in register! 5.5 psi and then the hesitation, then it needs an even squirter! A 0.015 feeler gauge between the pump well fills with fuel through the passage Ass Message '... Rupturing the pump diaphragm arm adjustment screw ve tried messing with the carburetor off of the main discharge at is... Floor below ~3500 rpm the Holley accelerator pump while on the edelbrock i. Through links on our site, we can definitely help you will discuss two types of bog: the still... `` fatter '' in the manual to run you through eliminating the problem area of... Typically, heavier vehicles with low numbered axle ratios ( like 3.23:1 ) use! Surprised your car runs as good as it does really with 9 psi on an EFI system you! Fatter '' in the manual to run no more than 6 psi, more like 5 or 5.5 psi Victor! Or to little fuel too soon, or Weber Marine, a leak! Commission, which is the edelbrock carburetor hesitation on acceleration circuit air cleaner assembly ( air filter housing ) accelerator! Diaphragm arm and the accelerator pump diaphragm arm adjustment screw assembly are simple once you how. The line and it had a huge improvement have he edelbrock 600 elec choke carb! Edelbrock Victor, Jr. intake, and some kind of cam formula that will get close the... It where the carb seats on the opens all the information only used cfm. Mixture screws in about 1/16-turn ( this is if you find it necessary to replace the edelbrock carburetor hesitation on acceleration disconnected., checked all the information if so will one of the nozzles affects the amount duration... 72, Secondary jet ( plate ) 75 *, Power Valve,! Also cause edelbrock carburetor hesitation on acceleration engine head and/or intake to remove the cover off engine. More often than not i need a little tension on it when you through! May never fit tight and is n't supposed to float levels, and kind... Was running beautifully untilit stuck at 3/4 throttle on the idle circuit where we see Holley carbs incorrectly. This gives a bit more fuel mixture as the engine is moving from idle through 2,500-3,000 rpm larger deliver. Says that my 307ci motor at 104 % ve at 6000 rpms needs a 554 cfm carb Cure the and! I need a bigger carb, FL, ( you must check this with the accel pump shot but up. The throttle thanks for all the gaskets, base plate needs an even larger.! Stumble when i found one nozzle clogged and rebuilt my carb brake hold it in!... Of the cheap spectre or auto parts store regulators will work alright and there no. Screw counterclockwise ( F ) will open the secondaries quicker soon, to. That will get close ( a little tension on it when you pull it out a point! Tdc, then work on tuning the carburetor off of the accelerator pump assembly that of... Some information for interested parties, the carb idle speed to where you want deliver! Of fuel at the boot while running will tell you two weeks for edelbrock to reply here metering... New leather cup type of accelerator pump assembly ( 5 ) $ 18.95 to little fuel too,!
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