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How do you adjust the idle on a 1985 Ford F-150?

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Wiki User
2015-07-15 21:17:36
2015-07-15 21:17:36

turn the idle screw!

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probably a bad idle air controller.

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Hey JustinThe idle speed is controled by the ecm and is not adjustable. Goodluck, Joe You can adjust the idle air screw. Get a haynes manual it will show you how

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A bad IAC (Idle air control valve) or a vacuum leak or both.

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Don't mess with that adjustment. The idle speed is electronically controlled.

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If it is a federal vehicle you can't adjust it.has IDLE control valve.that sucks,huh.

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you can adjust it via the idle control valve.


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