Question about 1998 GMC Blazer

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My name is mike miller NAM VET 1968-69 Thank you for answering my question. I have a 70-1970 7045214yb 1536 gm motors rochester Quadra jet There are 2 two mixture screws at the base looking at the front 1 one under the fuel filter and the second one on the right of it, which one is the fuel mix and which one is the air mix THANX MM

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  • lori_lynn_mi Jul 18, 2010

    hay buddy you the man




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The air/fuel mixture screws meter the fuel that flows under each primary throttle plate when the throttle is closed at engine idle. Both of the air/fuel mixture screws control fuel flow.

Turning the mixture screws "in" will decrease the fuel flow and "lean" out the air/fuel mixture, and turning the mixture screws "out" will increase the fuel flow and "en-rich" the air/fuel mixture.

To adjust the air/fuel mixture warm up the engine to normal operating temperature and with the choke off at normal idle speed. Adjust the air/fuel mixture screws one at a time, and turn each air/fuel mixture screw "in" until the engine just begins to mis-fire, then back the air/fuel mixture screw "out" 1-1/2 - 2 turns a half turn at a time until the idle is smooth.

If you need a base setting to start with, then turn both air/fuel mixture screws "in" until they lightly seat, and then back them "out" 1-1/2 - 2 turns and then start and warm up the engine and then proceed to adjust the air/fuel mixture as described above.

My name is mike miller NAM VET 1968-69 Thank you - 4d366e0.jpg


Posted on Jul 12, 2010


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