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Idle Air Control (IAC) Valve

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. Open the hood.
    2. NOTE: The main symptom is an elevated idle speed while noise is occurring.
    NOTE: "Snapping" the throttle can induce the noise.
  2. Verify the condition by operating the vehicle for a short time.
  3. Inspect the IAC valve. If physical evidence of contamination exists, install a new IAC valve.
  4. While the noise is occurring, either place an EngineEAR probe near the IAC valve and the inlet tube, or create a 6.35 mm - 12.7 mm (0.25 in - 0.50 in) air gap between the inlet tube and the clean air tube. If the IAC valve is making the noise, install a new IAC valve.
  5. Test the vehicle for normal operation.
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