Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Idle Mixture Screws

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59bluesilver:
Something doesn't quite make sense to me. The air mixture screws in this quadrajet shown below are both 1 3/4 turns from the seated position. However, the right one extends much further into the venturi than the left one. Is that the way it supposed to be?

Frank400:
could be two things.  You may have mismatched idle mixture screws.  I've seen different tapers thu the years. And/or, the idle discharge hole may not be the same size on both sides.  I've seen it on virgin carbs.  Have you measured both sides idle discharge holes ?

59bluesilver:
The screws are the same length as is the springs.

Jeffs68:
I don't think it matters. When you are making your adjustments, turn each one in, one at a time until the engine starts to run rough and Revs drop, then back it out 1/2 to full turn. You can use a vacuum gauge to assist, make adjustments that will give you the most vacuum possible.

59bluesilver:
I guess I don't understand what the taper does or its function. There must be some reason why it extends into the Venturi, or not. Can someone explain it to me?

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