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Idle Speed & Mixture

NOTE: Idle mixture on fuel injected models is controlled by control module and is not adjustable. Controlled idle speed and IAC count can be checked using scan tool. See CONTROLLED IDLE SPEED & IAC COUNT table. For controlled idle speed adjustment procedures, see the ADJUSTMENTS article.
CONTROLLED IDLE SPEED & IAC COUNT

Application Idle RPM (1) IAC Counts
Auto. Trans. (2) (3) (3)
(1) Add 2 counts for engines with less than 500 miles.
(2) Automatic transmission in Drive.
(3) Information not available at time of publication.
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