Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Ported vacuum not acting ported.

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sixth_sense676:
Having trouble with my ported vacuum. The port is always producing vacuum for some reason. This causes obvious problems for my vacuum advance. How do I fix this/why is it doing this?

Also, when I shut off the engine hazy fumes float up out of the carb. Is this normal?

429bbf:
do you know what your idle rpms are ? it sounds like your idling to fast and your throttle plates are open to far causing the problem.

Cliff Ruggles:
What is the carburetor number?

What is it being used on?

What have you done to the carburetor?


.....Cliff

sixth_sense676:
Carb# 17058253

9.1:1 C.R. Pontiac 350 XE262Cam

Idle @ 900RPM, though at 500rpm the port was still open.

I rebuilt the carb with a HP kit and recipe #1.

Cliff Ruggles:
Most likely needs more idle fuel and idle bypass air.  Recipe #1 is not enough for that engine/cam combination....IMHO

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