Edelbrock Carburetors - Troubleshooting - Hesitation and Stumbling

really simple and helpful... thanks!

Edelbrock carbs suck balls, period.

How do you really feel????

haha

Just to set the record straight. Edelbrock Carburetors are NOT made by Carter. They have up until last year been built by Magnetti Marelli/Weber USA, here in the USA. The division which has been subsequently purchased by Edelbrock, LLC. The Edelbrock Carburetor was originally based on the Carter design but was re-designed with more efficient booster clusters back in 1989.

There are other ways to improve off idle hesitation, lighter step up springs, larger squirter/nozzle, smaller larger number on metering rod. Also initial distributor timing plays a roll in all of this.

How do you adjust that accelerator pump?

Move the pump link up to the top hole, closest to the top of the careburetor.

My oil smells like gas. I have a 750 performer. Idle's fine, throttle response great. plugs look like it's running rich. What would you recommend.

What is your distributor timing at? We suggest 10-14 initial minimum.

My problem is my gaspedal. When i put my foot to it very gently it will take off normaly but when I push just a little bit harder past the tough spot it will slam down and give way too much gas. Cable/lever seem to be running free. Ever heard of this problem before?

The idle air mixture screw on the drivers side doesnt seem to work. Ive tried blowing it out with compressed air and sprayed carb cleaner in the hole with the idle air mixure screw out and blown it out with compressed air again, and still doesnt adjust. Any suggestions?

Richard, the next step and the only way to cure the idle mixture screw to become responsive is to remove the top lid from the main body and re-adjust the float level. Make sure you use a 7/16" drill bit as a measuring tool and you want it to slide or roll under the float HALF WAY before the bit raises the float. The idle screw will now become adjustable again.

I have a problem..SBC 355 10.2:1 comp edelbrock performer rpm top end and i go to smash the Gas and it has a dead spot then sometimes lights the tire up or sit there and dhdahdahhh vroooom..Idk iv tryed everything 600cfm dosent work and 750 dosent work...same thing out of both of them...and rev s slow, and if i smash the gas hard it sounds like it shut off and revs up ...fucked up

68 chevy c30 327 manual had a horrible bog and stumble, replaced it with a new manual choke edelbrock. Installed, adjusted idle, and ran like a bat outa hell. Then about a mile down the road it started stumbling and bogging horribly. Now I can't even get out of my driveway it bogs and stumbles so bad. Cap, plugs, coil, wires are all new. Timing at idle is at 15 degrees. Idles and revs then randomly dies. No vacuum leaks. I'm thinking it's bad gas

well now i know why mine was doing that, Thanks for the tips!

Hope someone can help me. Got a rebuilt 351C with edelbrock 650.  Was running and then a stumble/hesitation appeared at idle, it was idling rough.  Now engine will not remain running at idle? Runs rough with accelerator held, but dies immediately at idle.  Is this carbuerator issue? Changed fuel filter-fuel is new and was treated with Stabil 360.  Removed Idle air mixture screws and blew air through circuit and changed fuel filter with no success.  Is it possible something is clogged? If so, how do I fix this.  Carb is less than a year old and only has about 700 miles on it.

Ok-I'm in desperate need of help!! Got 351C with edelbrock 650 Thunder AVS.  Secondaries will not mechanincally open at WOT.  Looks like there is a linkage or some sort of cam that hangs loosely on drivers side of carb that hangs up secondaries from opening?? Can this cam be removed? What is its purpose-it just hangs loosely?? Its a 73 mustang with fmx trans and I used correct throttle adapter.

well fuck. thanks for showing how to adjust it.

Im having trouble with my 350. Runs good when u give it gas but it idles like shit and stalls out. Looks like the throttle body is sticking closed and causing it to starve for gas. Idles good when in motion at speed limit but when moving slow it idles rough dies or stalls out unless u give it more gas can anybody help i have a video and on how it acts.

My 86 k10 has a 350 and it bogs or hesitates only when I floor it from a dead stop pls help do you think this is it I have a fresh motor and new carb

Need help. I’m running an Edelbrock carb on my 289 with a c4 auto . Runs perfect. However, when sitting at idle or slowly cruising, it I punch the gas, it has a massive hesitation bog or sometimes cuts the engine off completely. I’ve made it this far to this video. Should I adjust the acceleration pump to the larger setting even though it’s only a 289? Or should I be looking elsewhere, like timing?

I am in the final stages of tuning a 1405 on a 302 and experienced the same issue described in this video. For me the fix was to remove absolutely ALL play in the linkage, by adjusting the bend angle, so that the accelerator pump is activated immediately when the throttle is depressed.

My edlebrock hesitated while just tipping the throttle for years, nothing I tried worked. NOW it is FIXED after looking carefully at the throttle butterflies and found the 4 screws loose. So I made sure the butterflies can fit perfectly in the completely closed position then tighten screws very firmly.
Now the idle stays put and it drives like a fuel injection engine. Perfect tip in but I wish I would have found this problem 10 years ago.
Even if your screws are not loose the butterflies can still be center better than edlebrock's assemblers.
FYI even though my screws were loose they can't fall in your engine. I'm not sure how but I tried to take my screws out but they got harder to turn so I left them in and tried to use lock tight the best I could. Can't hurt. Good luck.

i have a 350 small block with 1406 edlebrock idles good goes into gear alright but when i give it barely any gas in gear it stalls out or surges

Hello,
I have a 1406 on a stock SBC 350 and I have stubble gurgle only when taking off from a dead stop otherwise the engine idles and runs the best it has ever run, any thoughts? Thanks.

Ty bud I fixed my stumbleling carburetor

I put an edelbrock 650 on my ALL original 69 Super Bee 383.. They recommended the AVS2 650 CFM. Back fires through carb all the time. Tried moving accelerator pump rod, new plugs, fully charged battery. Theres a Reason why Edlebrocks are considered JUNK.. I wasted $400 on this carb because it fit my stock application without moving things around. Ill send it back to Summit and buy a Holley. Im OK with having to move my coil, use braided fuel lines etc to have my car run right.. Totally disappointed in the Edelbrock carb. Even ona 335 HP stock engine..

I have an avs 650 on my 350, it's doing the same thing, but will also sometimes do it randomly under a more moderate acceleration, brand new carb. Pump arm in the middle hole. Any suggestions? Runs good idling, runs good cruising.

I have a hopped up Chevy K10 with a 350 and Edelbrock 1403 carb. When I first had the truck I could smash the gas and burn rubber. The tail end would slide out too. After being able to do that a few times, it stopped having that initial punch of power. Now it just slowly builds from a stop. It's like I didn't even floor it at all. What's weird is that on the highway the secondaries snap open just fine. They won't do it from a stop though. What's my issue?

Super helpful. In idle I'd blip the throttle and it would have that hesitation you described. I moved the accelerator linkage to the top hole and that provided a bigger squirt of fuel until the main jets could take over.

I had the hesitation when accelerating. Watched the video and then moved the accelerator pump rod to the top hole and now it's GREAT! 350 Chevy - 400 hp. ** THANK YOU **

Ok so what am I checking ?

Also with a bigger cam, change out to a heavier spring. In my case I used the silver spring from the strip kit. Now I have a slight hesitation while driving. So next is leaner, or richer jeys, and rods.

But do I need more or less you didn’t get into it

To be honest. I hardly drive my 63 with 327 small block 1406 edlebrock carb. I can get it to start with starter fluid. But would die out. The bowl shows gas. But still dies out? Is it a bad floater ? Thank you in advance.

Awesome! Fixed my rough idle issue and hesitation on my 81 c10

I have my 1405 on my 289 set to the top whole is it's VERY responsive... I've been have a stumble or rpm drop on braking and turning though, I'm guessing a float adjustment is needed... just not sure which way to go with it...

all this yapping to say its an accelerator pump

What if you not getting ay squirt at all any thoughts woukd be helpful

I have an issue with it bogging at WOT. Does anyone have any thoughts at all? Carter Carb