Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Dieseling

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Chevynation:

--- Quote from: Kenth on October 22, 2023, 05:29:26 AM ---No need for epoxy.
A new gasket will cover the unwanted hole and solve the idle bypass issue as the slotted hole in gasket acts like an air channel leading air to were it´s needed.

--- End quote ---
For the time being I just drilled to the next hole and put epoxy in the first hole so it’s not robbing the idle bypass air. Everything works as it should now. Can’t wait to take it out and get gear soaked to see how it acts.

Chevynation:
Everything went smooth but when I set the idle and drive it and it gets hot it will go up.  I figured it was normal since it heated up. So I lowered it and then I get down the street and it’s higher again. I’ll set it at 750 and it will go up to 1000 by the next time I stop. My throttle return spring is pulling the lever back to the screw so I’m not sure why the idle keeps going up. I can’t find any vacuum leaks. Should I try to reduce the idle bypass holes? My curb idle is pretty much backed all the way out at this point. If I pull on the throttle lever towards the stop then the idle will drop but no spring will be able to pull the lever back that tight to lower the idle. My throttle shaft bushings were replaced when it was rebuilt so I’m not sure why I can lower the idle by forcing the lever to the closed position. Idle bypass holes at .136 currently.

Kenth:
Check for weak distributor centrifugal weight springs, or binding weights, not returning the advance when letting off to idle speed.

Chevynation:
Tried that. I’m using a billet distributor and I’m using a heavy and medium spring. Repeatedly tried to see if anything was sticking. I can’t see me having to use two heavy springs.

Chevynation:
Went up to a heavier spring. I’ll post back later this evening.

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