Crown Victoria V8-4.6L VIN W (2000)
Idle Air Control Valve: Testing and Inspection
Idle Air Control Valve Noise Test
1. Open the hood.
2. Verify the condition by operating the vehicle for a short time.
NOTE:
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Key symptom is elevated idle speed while noise is occurring.
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"Snapping" the throttle can induce the noise.
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 IAC valve.
5. Test the vehicle for normal operation.
For further information concerning the diagnosis of this component and that system that it is a part of, please refer to Computers and Control Systems;
Testing and Inspection.
