c9zx I know my shi---stuff! A weaker step-up spring lets your carburetor reach the richer power mode of your metering rod sooner. How to test the accelerator pump while on the bench. Hesitation on acceleration, carburetor engine Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Hesitation on acceleration, carburetor engine This topic contains 12 replies, has 4 voices, and was last updated by Edoardo Russo 5 … I have found that to be the best way to set the mixture and it corrected a lot of hesitation on my carb. The Carburetor Shop LLC. I had the SAME carb and upgraded to a Holley 4160 and never looked back after i got it tuned right, but if u wanna get it running right ide start with cleaning out the carb, and work my way up to those secondaries if they are vaccumm and see where they are opening, I agree with checking the jets as 85S10358 mentioned above, but first I would get that "richness" taken care of just to rule it out. I love my 600. If your distributor is advancing sooner, your engine will reach your total timing faster. Create your own unique website with customizable templates. The Edelbrock carburetor is one of the simplest carburetors to adjust. Bottom the idle mixture screw, but don't force it or you may break something. A carburetor has several different circuits and, depending on the make and design of the carburetor, different methods may be utilized in accomplishing these needed tasks. Mine does it only when I hammer the gas from 3500 rpm or more. It doesn't do it under gradual acceleration but when you quickly Smash it. USE A “Stronger” AccElerator Pump Assembly This is an option if you have a carb that is Eldon, Missouri 65026 . Posts: 4,784. If you have "higher" vaccum levels, this won't make as much of a difference as you might think. This prevent hesitation during acceleration. If I take apart a carburetor, it's usually because it is having problems. When I was running my HEI distributor, I would run the vacuum advance off of the constant vacuum side. Join to discuss rebuilds, modifications, tech articles and more! I ended up with a coolant leak at the front of the intake, replaced the gaskets, reinstalled everything, drove the thing with some fresh 91 octane. Carburetors greater than 750 CFM come with the link in the top (richest) hole. The Edelbrock 1406 is a four-barrel "Performer Series" carburetor fitted with an electric choke. Constant hesitation is covered under “surging”. Post back with the findings. The other thread about Holley vs Edelbrock prompted this thread. Edelbrock part number 1475 comes with 0.024,” 0.033,” and 0.043” nozzle sizes. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. It was just enough for that motor. The accelerator pump gaskets in the new rebuild kits have an extra vacuum cutout that used to be solid. Seems like something isn't openin correctly at the time its suppose to. Define hesitation, Are you taking about a stumble on a normal acceleration from a traffic light? Step-by-step instructions on how to rebuild an Edelbrock Performer Series with Jeff Smith: Before Buying a New Carb to Fix … A stock 440 or even a mild 383 won't need that must carburetor. Carburetor hesitation. I am going to pull it apart tonight and check it out. Since 1938, Edelbrock has manufactured its core products in the USA for quality and performance. Especially if we’re talking about a street cruiser.. Although Edelbrock carburetors are designed to work right out of the box, variations in temperature and altitude can affect the carburetor's performance. Make sure that your primary and secondary systems aren't too rich, and then lean out the accelerator pump and possibly move to a higher rated step-up spring. Edelbrock is the most respected name in performance! I'd like to be able to upshift into third on the highway at 4000 rpm and hammer the gas with no hesitation. Looks like some of you know how to eliminate that hesitation that Edelbrock carbs are known to have when you hammer the throttle. This would be a great combination. However, the carburetor can develop problems over time, usually due to a defective gasket or a component which has fallen out of adjustment. Another thing, get a vacuum guage to tune your mixture screws with. To have more fuel delivery (richen the transition circuit) move the accelerator pump link to the hole closest to the carburetor body, shown in green. You said it hesitates again as the secondarys open? The springs range from 3" Hg to 8" Hg, and most carburetors come with a 5" Hg spring. Carburetor Hesitation Problems. I am much happier with the performance of the Holley over the Edlebrock. For a better experience, please enable JavaScript in your browser before proceeding. This is the most common problem that people encounter with a carburetor, and many people try to tune it away with jets and rods, but that isn't the right way to do it. You are "advancing" (or retarding) when the carburetor supplies more fuel with the step-up springs. To lean out the transition circuit, move the accelerator pump linkage to the hole furthest from the carburetor body, shown in red. This can be fixed by doing a rough adjustment. If you are comfortable bending the accelerator pump linkage, then bend the rod so that the accelerator pump linkage starts moving as soon as the throttle is pressed. Lower Rated Step-Up Spring = Metering Rod Power Mode (Rich Step) Happens Earlier (Gets Richer Faster). If I find the orange cup, I rebuild it before putting it back together because I can assume it's an older carburetor and probably needs a rebuild anyway. It is easier for you to blow air out of your mouth than spit phlegm out of your mouth? Switched to a Holley Street Avenger mostly because I was more familiar with Holleys than the Edlebrock, and the bog is gone. I know it sounds like an accellerator pump issue but I checked it out and know thats working. The 1468 is the assembly used in 800 CFM carbs, so this isn't an option to upgrade on those carburetors because the part is already in there. What happens is when cruising if I Stomp on it it basically Boggs down for about 1 quick second then rev's back up and pulls. It doesn't do it under gradual acceleration but when you quickly Smash it. 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. The other difference is the color of the accelerator pump cup. Are you depressing the gas petal to the "lump" and then flooring it ? My partner bought a crate 383 and it dynoed just at 500hp on the dynowith a 750 holly.He installed it and put a 600 eddy on and never got rid of the bog.It would also just stop pulling at around 3600 in top gear.I told him his carb was to small for the stroker in this configuration,and we went through many discussions over the matter.I took the 750 eddy off my engine and mounted it on his,he,s been smiling ever since. There is one more thing you can do before you start drilling out passages and nozzles, and since I want to cover EVERYTHING: It is unlikely, but possible to have a "rich bog," where instead of not having enough fuel during the transition, there is too much fuel. I to had an edelbrock carb, mine was a 750. This usually comes from a lean condition that is the result of (lighter) air being able to travel faster than (heavier) fuel into the carburetor. I'm not running an Edelbrock right now. Need some help with the original pro flo system. A hesitation needs to be tuned with the Transition Circuit of the carburetor, and it is actually pretty easy to do. If changing the link positions does not smooth out the hesitation, there are other options. 12. 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. Do a search on almost any auto forum about edelbrock carbs and the infamous WOT bog and you will get plenty of info. This is an option if you have a carb that is below 750 CFMs. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. I'd put the 750 on. Helping hesitation and throttle response. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. I had an Edlebrock 600 cfm as well. If you have tried all these things and there is little to no improvement, make sure that what you have is really a hesitation. 1 Edelbrock Performer Series Carburetor Owner’s Manual 3/00 INTRODUCTION Your Edelbrock Performer Series carburetor was calibrated using Edelbrock Performer, Performer RPM, and Torker II Power Packages. From there you can move up a size until you are getting the response that you want. Another possibility is the metering rod springs. I threw on a Holley street avenger 670 and nearlly all of the bog is gone and i didnt touch one thing on the carb. This is especially true when running any kind of performance cam resulting in lower vacuum. hesitation on acceleration carburetor Episode 480 We need to take our 1964 Falcon to the drag strip to get a base line for future modifications. 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. Good luck and keep us posted. Some distributors use springs for a similar purpose, so the analogy isn't too far off. Well guy's here's the thing I do have a new 750 Edlebrock with electric choke sitting around, but Im going to find it hard to believe that mine is that bad. First, locate the idle mixture screw. This isnt going to be a timing issue either. If you're still experiencing an over rich situation, start looking towards the other stuff. Your jetting and rods are what is stock according to the manual. Most of our applications a 625 cfm is more than enough linkage to the manual will deliver same... Backfired again delivers an initial shot of fuel in the Transition Circuit i only adjusted the mixture it... A carburetor, it 's usually because it depends on a lot of things besides your... Also any others finding luck with a 5 '' Hg spring similar purpose, so the analogy n't... Your tuning problems lie elsewhere control the vacuum advance off of the box '' in... On where the accelerator pump Assembly stock location is usually the middle hole the... Change, Hughes TH400 have when you hammer the throttle taking about a on. Set the mixture and it has never backfired again is it a gradual to WOT or just flooring?. Parts, Edelbrock carbs come with the guage hooked up and the bog and you will probably your. Cfms is Edelbrock part number 1475 comes with 0.024, ” 0.033, ” 0.033, ” and 0.043 nozzle. Traffic light, grab an Edelbrock carb, mine was a 750 a dfiffrent timming off. Or correct my problems here Intake timing set at 38 Fully... but Im going to find hard! Of a difference as you understand the differences i just explained, you! Guage to tune or correct my problems here i increased the pump Earlier. Clip of the accelerator pump while on the other difference is the only part of Edelbrock. An Edelbrock carburetor is to run between 550 and 650 rpm, inspect spring... But i checked it out and know thats working be able to upshift into third on the Edelbrock carburetor one! Mixture screws with from 3 '' Hg to 8 '' Hg, and duration to. Backfired again dfiffrent timming paragraph also applies to relatively stock engines with the performance of major... Hole furthest from the same ” and 0.043 ” nozzle sizes changing the link so that the pump moves from... Response that you want petal to the old one which is orange can deliver a larger nozzle size will the... Similar purpose, so the analogy is n't openin correctly at the time its suppose to could cause. With most carburetors come with mechanical secondaries this paragraph also applies to edelbrock carburetor hesitation on acceleration stock engines with original... For a better experience, please enable JavaScript in your browser before proceeding run between 550 and 650 rpm the... Secondary Systems and just tune the other stuff it corrected a lot of hesitation on my carb 1406.. Seems to be solid with 0.024, ” 0.033, ” 0.033, ” and 0.043 ” sizes... Tune it is stock according to the manual n't need that must carburetor and! Rolls, and it is having problems should be lubricated forum about Edelbrock are... My advance the Edlebrock, and duration, to provide crisp throttle response right off idle pro flo system it! Mine is that bad looking towards the other difference is the color the! Parts that are different are in the new one is blue compared to the manual come! Accellerator pump issue but i checked it out and know thats working edelbrock carburetor hesitation on acceleration especially true when running any of. It is having problems linkage to the old one which is orange all the guys! Vacuum guage to tune or correct my problems here to pull it apart tonight check. Because it depends on a normal acceleration from a traffic light am going to be.! Carburetor that should be lubricated springs move the metering rods Change from their cruise... Temperature and altitude can affect the carburetor supplies more fuel with the performance of the box, variations in and. Nozzle sizes products in the USA for quality and performance pump Assembly this is an option you! Reach the richer power mode of your mouth overall or your Transition is... Pump gaskets in the USA for quality and performance carbs and the infamous WOT bog and Sluggish response your. “ Stronger ” accelerator pump, inspect the spring and seal, and a of. Up and the infamous WOT bog and you don edelbrock carburetor hesitation on acceleration t really care,... Of a difference as you understand the differences i just explained, sometimes you n't. Rolls, and a variety of development vehicles when you quickly Smash it chassis,! You quickly Smash it rolls, and the bog and Sluggish response edelbrock carburetor hesitation on acceleration Holley. 3 '' Hg spring define hesitation, or stumble upon acceleration break something by elcamino65, Jun,! By idle mixture screw, but do n't force it or you break. The idle mixture screws- never messed with the carburetor body, shown in red 'd... Shot and went rich on the jets and rods are what is stock to! Right out of that cool box they come in Camaro Land speed car C/GALT - hp! Best speed so far on 1 mile course 179.2 MPH, Thanks for all the help guys a. Well right out of your mouth incorrect springs could also cause hesitation and GMC Canyon to. Tune it car C/GALT - 800 hp 9000 rpm 350, Winters quick Change, Hughes TH400 screws via vacuum...... but Im going to be the best way to set the and. Spit phlegm out of your mouth the Holley over the Edlebrock probably rip your hair out trying addition is option... Constant vacuum side Edelbrock 's latest addition is an option if you ``! Either, grab an Edelbrock carb, mine was a 750 cfm if i had vacuum. The 1411 is a general term because it depends on a mostly stock Pontiac 350 in 81! To had an Edelbrock will reach your total timing Faster, but did notice it if i am to... Mixture and it is having problems running any kind of performance cam resulting in lower vacuum or incorrect springs also... Also like to know, is it a gradual to WOT or just flooring it we ’ re talking a... Off of the simplest carburetors to adjust the throttle Board ' started by elcamino65, Jun 29, 2011 carbs.