Frustrated with carburetor!!!!!
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Frustrated with carburetor!!!!!
I can't get the damn thing to idle! It wasn't running so great before I took it off. There was a bunch of rust in my fuel line so I replaced everything including tank. Put one of Lars' carbs on and it ran like a champ. So I cleaned up my Speed Demon 650 and put it back together. I put it back on and I can't get it to idle. It just dies. I can constantly blip the throttle and it seems to run fine above about 2500 rpm's but when it drops below 2500 it just dies. I've put the mixture screws back to stock positions with no luck. I've adjusted the primary and secondary idle screws until I'm literally blue in the face :mad :mad :mad !!!
Anybody know what this means or what I should do???
LARS, if you're reading this I'm just about mad enough to just send it to you and see if you can get it tuned (I'm sure you can). I've got one of your loaner carbs already and if there's not too much of a demand for the one I've got maybe I could keep while you work on mine? Or maybe you have another one that would work.
FRUSTRATED!!!! :mad :mad :mad :mad
Anybody know what this means or what I should do???
LARS, if you're reading this I'm just about mad enough to just send it to you and see if you can get it tuned (I'm sure you can). I've got one of your loaner carbs already and if there's not too much of a demand for the one I've got maybe I could keep while you work on mine? Or maybe you have another one that would work.
FRUSTRATED!!!! :mad :mad :mad :mad
Le Mans Master
Joined: Dec 2000
Posts: 9,752
Likes: 0
From: Chattanooga TN
St. Jude Donor '08-'09
Re: Frustrated with carburetor!!!!! (tshort)
Check for vacuum leaks. What kind of intake are you using. You may have to get a plate to cover the spreadbore voids. Edelbrock sells one. I think it's about $6.
Le Mans Master
Joined: Dec 2000
Posts: 5,245
Likes: 25
From: Blue Ridge Georgia
Re: Frustrated with carburetor!!!!! (e3pres)
I think it 's your gasket under the carb. I had this happen one time. Was going to change to a thicker gasket and it wouldn't run. The gasket serves two fuctions on a Demon. One is that it is a gasket, two it closes off some of the vac of the carb. One have to have the right gasket next to the carb to close off these passesges.
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: Frustrated with carburetor!!!!! (Steve Adkins)
Changing the gasket is no problem but why does it run fine with the Holley and not with the Demon? And the Demon didn't have these problems before. It wasn't running perfect but it was nowhere near this bad.
Senior Member since 1492
Joined: Aug 2000
Posts: 87,933
Likes: 156
From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Re: Frustrated with carburetor!!!!! (tshort)
The Holley manual states to use a new gasket each time the carb is removed/replaced.
Melting Slicks
Joined: Dec 2000
Posts: 3,407
Likes: 2
From: Carmichael CA
Re: Frustrated with carburetor!!!!! (tshort)
It sounds like the carb's idle system is not functioning. I had this same problem with a 2BBL carb in my other car. I took it apart and did a complete overhaul, but had the same problem. I finally figured that there was some contaimination in the idle system passageways, or perhaps even a crack in the body preventing vacuum from drawing fuel properly. Whatever the problem was I chucked the carb into the garbage and pulled one out of the junkyards...stuck it on and it's been running fine for years.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: Frustrated with carburetor!!!!! (Rockn-Roll)
Well after paying over $300 I don't think I can just "chunk" this one in the trash. Wish it was just that easy!