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Home >> GMC >> 1990 >> Forward Control 3.9 L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - TBI >> Diagnostic Tests >> Code 35: Idle Speed Error (2.5L) >> IAC Valve Reset Procedure

IAC Valve Reset Procedure

Turn ignition off for 10 seconds. Start and run engine for 5 seconds. Turn ignition off another 10 seconds.

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