General Category > Quadrajet Carb Talk and Tips

'77 Vette high idle

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Cliff Ruggles:
Nothing should happen to engine speed if you manually open the secondary air flaps at idle speed.

This indicates a problem with air getting past the throttle plates in the baseplate.

Do not rule out the distributor, put a timing light on it and make sure the timing is ROCK solid at idle speed.  I can't budge at all cranking to idle and shouldn't start to advance at all until right off idle.

Aftermarket "high performance" distributors are troublesome for that deal as the mechanical advance mechanisms have too much leverage.  I don't even work on them here for that reason.  By the time you get strong enough springs on them to hold them back at idle they refuse to advance correctly.....Cliff

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