Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

secondary air valve shaft

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Cliff Ruggles:
Several things can cause this, worn at the throttle shaft is one, installing bronze bushings will correct that issue.  The distributors mechanical advance/springs will also cause this, varying ignition timing at low rpm's varies the rpms at idle speed......Cliff

jbh7052:
thanks cliff. we can rule out throttle shaft since you guys put bushings in mine. I may try using some different springs. guess I could polish the weights and make sure they aren't binding or catching on something.

Cliff Ruggles:
Those POS spring kits, light springs, or tired stock distributor springs cause more issues with idle quality that carb problems do.

The timing curve MUST NOT START until a few hundred rpms above the curb idle speed, or can and will add some timing at idle, and cause all sorts of idle speed and tuning issues.  I see this ALL the time as we build a LOT of factory distributors here.  ALL of those aftermarket parts, weights, cams, springs, etc go straight in the round file next to the work bench!....Cliff

jbh7052:
10-4!! I am on it. ordering aftermarket today.

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