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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 971 (Noise, Vibration & Harshness -- Excursion & F250-F550 Super Duty) >> Diagnosis And Testing >> Noise, Vibration and Harshness (NVH) >> Component Tests >> Idle Air Control (IAC) Valve

Idle Air Control (IAC) Valve

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, and 2003 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
  1. Open the hood.
    2. NOTE: Key symptom is 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 (0.25 in)-12.7 mm (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 IAV valve.
  5. Test the vehicle for normal operation.
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