General Category > Quadrajet Carb Talk and Tips

Proper idle air/fuel adjustment

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Bills64:
Thanks to all!

Cliff Ruggles:
For the most part 1979-up carbs with the metric thread pitch mixture screws are 2 to 1 for turns to adjust if you are counting.  So most later carbs come in around 5-7 turns vs 2.5-3.5, for example.  Also be aware that the factory also downsized the holes under the mixture screws, plus put tamper proof covers over them.  This was done so even if you removed the covers you were NOT able to add a lot of fuel with the mixture screws because the restriction under them was too small.......

lightning boy:
You'll be able to hear the exhaust sound change when you tighten the mixture screw down. I call it a lean roll.

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