Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Electric Choke Issues?

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TravisUT:
HEI ignition, idle RPM is around 700-720 with choke off, tested using manifold vacuum. My timing at idle is showing about 1" in front of the timing tab, which ends at 16... Vacuum advance is hooked up as well.

Kenth:
"I hooked a vacuum gauge up to the big manifold port on the front-bottom of the carb."

Here is where the hose from the PCV valve should be attached and since it´s a calibrated "vacuum leak" it should be attached while adjusting the idle needles.

Also, timing is to be adjusted with the ignition vacuum advance disconnected and plugged.

Does your carb have a new float and inlet valve?

TravisUT:
Thanks @Kenth.

If the PCV valve should be attached while adjusting, where do I hook the vacuum gauge up to?

Yes, carb has all new parts.

Kenth:
I would use the port right above the fuel inlet for the vacuum gauge.

Cliff Ruggles:
"I just changed out the coil/cover, and did away with the hot air tubing."

You MUST block the vacuum supply to the choke housing to do an electric choke "conversion".  You will loose any idle bypass air if the carb was drilled for it. 

If you don't block the vacuum supply then you have an unfiltered vacuum leak plus you are drawing air into the housing to cools the electric choke coil......

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