Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

CCC Qjet rich idle problem

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slicer87:
 The engine is pulling 18-19 in of vacuum. When I unhooked the brake booster line to cause a leak, the engine idled better. 

slicer87:
Here are a few more things I have found. When I back the idle stop screw out all the way it looks like the throttle plates do close. But the throttle shaft lever does not come in contact with the ear the idle stop screw threads into. Also the airhorn gasket has become wet looking. 

Cliff Ruggles:
The carb would have to be removed and the throttle body taken off, and held up to a light to know if it's closing completely.  Many do not, for one reason or the other.  Make sure all 4 throttle plates are correctly indexed, and fully seated when closed, then put it back on and continue tuning.....Cliff

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