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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1238 (Noise, Vibration And 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 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. 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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