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Idle Air Control (IAC) Valve: Installation

  1. Inspect gasket or "O" ring for damage. Replace if necessary. Measure distance from IAC contact flange to tip of pintle. 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 pintle length on a new IAC, use finger pressure to slowly retract pintle. Lubricate new "O" ring with ATF and install new gasket. Install IAC valve on throttle body. Tighten IAC valve to specification. See TORQUE SPECIFICATIONS TABLE at end of article.
    CAUTION: DO NOT extend or retract pintle if IAC valve has been in service, or damage to worm gear will result.
  3. Connect electrical lead to IAC valve and install air cleaner. Start engine and allow it to reach normal operating temperature. Drive vehicle at 43 MPH minimum to allow ECM to reset idle speed. It may be necessary to cycle ignition off and restart vehicle before proper idle will be initialized.
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