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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
Under 8500 GVW
Auto. Trans. (2) 565-615 50-30
Man. Trans. (3) 525-575 50-30
Over 8500 GVW
Auto. Trans. (2) 625-675 50-30
Man. Trans. (3) 675-725 50-30
(1) Add 2 counts for engines with less than 500 miles.
(2) Automatic transmission in Drive.
(3) Manual transmission in Neutral. Tech 1 scan tool will display "RDL" with transmission in Neutral.
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