Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

idles too high

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petro1143:
72 stock 455 ,stock rebuild kit from cliff.i set my initial timing to 10 degrees,mixture screws to highest idle/vacuum  ,, vacuum reads 18 and a little jittery. i back idle screw all the way out and idle wont go below 850,please help,it runs great just cant get idle down

Cliff Ruggles:
Vacuum advance on manifold vacuum at idle?

Did you install bushings in the throttle body and index the throttle plates, check to make sure they are fully seated, etc?.....Cliff

petro1143:
yes vauum on manifold straight out of base  plate in rear ,,, no i did not index the throtle plates. i did install your bushing kit and all the other parts from you ,,,,i will take off the carb and look the throttle plates,,,, tang for idle stops about 3/16 of an in from the casting if i back adjustment completely out i tried pushing the throttle back further but no difference,,also mixture screws work perfectly,both are out 2 3/4 turns runs great...no bog ...no hesitation

Cliff Ruggles:
If ported is available I'd use that as a source to the advance instead......Cliff

petro1143:
i took carb apart and got the air valves to seat better.got the idle down to 590 rpm,then when i hook up manifold vaacum it goes up to about 800 rpm i will try the ported vauum thanks cliff,all your parts worked great

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