Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
1600 rpm idle
F250 Restorer:
When I started the engine, echoke element removed, choke flap open, it idled at 800rpm. As the engine warmed up the rpm's increased, as though the fast idle cam were notching up in reverse.
Throttle plates are well seated. I think it is time to give up. Thanks for the help.
73ss:
Maybe the advance weights & springs are adding timing when this occurs. Check timing when the idle is high.
F250 Restorer:
I couldn't let it go. It bugged me that I couldn't find out why the carb was idling so high. So, I went back and tore it apart for the 3rd time.
I spent the day tracing v. passages through the 3 sections of the carb. Note: starting fluid sprayed in your eye isn't that bad.
I guess I had not searched the adapter and manifold because I had sprayed all around the base of the carb with starting fluid when the carb was running, and got no bump in the idle, so I figured there was no v. leak around the base. But on examination, I found this:
I was using a thin base gasket to save space. The passage that supplies v. to the choke pull off is exposed through this groove. I remember that the pull off was not working, and I thought at the time that it was bad. Now I realize that it was feeding the engine. Anyways, I think that is the problem. If I install it and it still idles at 1600 rpm, then the problem is beyond me. I'll find out.
Kenth:
It is not uncommon for ill-fitting adapters to cause hard-to-find problems with the carburetor. Avoid adapters if at all possible.
Original intakes are better than what the aftermarket intake advertisers let people believe.
FWIW
Bills64:
Intake manifold sealed good or a crack in it? Had a Edelbrock performer intake new and was chasing poor idle quality for some time and decided to clean both surfaces and set the intake on the heads without the gasket. It rocked like you wouldn't believe. Sent it back and put on an original cast iron intake (Pontiac) and no more issues.
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