Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

High HC's on smog test.

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77cruiser:
Not the idle speed, the 2 mixture screws in the front of the base plate. Adjust for best idle & turn in/lean about a 1/4 turn might help it out. Don't slow the idle that will make the HC higher.
What's the timing at?

Cliff Ruggles:
RPM was at 1130

Idle rpm is not that high, it is more than likely on the main system or pulling some fuel from the main system.  The throttle plates would have most of the transfer slots uncovered. 

Why did they do an idle test with the rpm's above the recomended idle speed?.....Cliff

Chili Palmer:
I can't say for sure why they tested it at such a high RPM was (if 77cruiser's post is correct) because he was trying to adjust stuff to pass the test and that's the closest he could get - if he lowered the RPM's the HC's would go higher.

I just talked to him the other day and he said he's going to join up - I'll try getting him in here so he can answer these questions more directly.

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