Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Warm idle fluctuation with slight backfire [VIDEO]

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turboguard:

--- Quote from: Cliff Ruggles on February 19, 2017, 02:43:21 AM ---Can't say as I've ever had to remove any material from the part on the throttle shaft that contacts the fast idle cam if the correct parts were being used.  Having to do that raises a "flag" here.....Cliff

--- End quote ---

It was the little free floating piece where the bottom touches the adjustment screw and the top rests against the fast idle steps...near the center of if there are two little spots on each side of the hole that stick out against the outer piece that holds the adjustment screw.  Clearance was fine if the throttle shaft was held open slightly, but when rotated to fully seated the little metal tabs would get held up and cause the shaft to stick, so I just shaved the tabs down a little to where they wouldn't stick when the shaft was fully rotated closed.

I'm starting to think I may have a major intake manifold leak...I'll find out tonight when I probe with some propane!

Cliff Ruggles:
Provided that the throttle plates are well seated in their bores at idle speed with the adjustment screw backed off and you are still seeing high idle speed, there has to be air getting to the intake from another source.

This assumes that you don't have HUGE idle bypass air holes or holes drilled in any of the throttle plates......Cliff

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