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Home >> GMC >> 1997 >> Suburban K2500, 5.7 R >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Specifications - 5.7L >> Fuel System >> Idle Speed & Mixture
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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) 525-575 Varies
Man. Trans. (3) 650-700 Varies
Over 8500 GVW
Auto. Trans. (2) 525-575 Varies
Man. Trans. (3) 650-700 Varies
(1) Add 2 counts for engines with less than 500 miles. Add 2 counts for every 1000 ft. above sea level.
(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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