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Home >> GMC >> 1995 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul - 5.7L. >> Fuel System >> Idle Air Control (IAC) Valve >> Installation
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Idle Air Control (IAC) Valve: Installation

  1. Inspect gasket for damage. Replace if necessary. Measure distance between tip of IAC valve pintle and mounting flange. Distance should not exceed 1 1/8" (28 mm). If valve is extended too far, damage to valve will result during installation.
  2. To set IAC valve pintle length on new IAC valve, use finger pressure to slowly retract pintle. Install NEW gasket. Install IAC valve on throttle body. Tighten IAC valve to specification. See TORQUE SPECIFICATIONS .
    CAUTION: DO NOT manually extend or retract pintle if IAC valve has been in service, or damage to worm gear will result.
  3. Connect IAC valve harness connector and install air cleaner. Start engine and allow it to reach normal operating temperature. Drive vehicle. It may be necessary to reset idle speed. To reset, disconnect negative battery cable for 10 seconds and reconnect. Cycle ignition on with engine off for 5 seconds. Turn ignition off for 10 seconds and restart vehicle. Proper idle will be initialized.
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