Ford Crown Victoria abnormal engine noise from IAC tube requiring replacement with revised part on Ford Crown Victoria

Some Ford Crown Victoria owners report experiencing abnormal engine noise originating from the IAC tube, which connects the Idle Air Control Valve to the air intake tube. This issue is recognized in Ford Article 94-22-4, identifying the factory IAC tube as the source of the problem. To resolve this, owners are advised to install a new Tube and Resonator Assembly (part number F5AZ-9H308-A). After the replacement, it is important to reconnect the wiring harness and start the engine to confirm that the noise has been eliminated. This issue is common among Ford Crown Victoria models, and addressing it promptly is crucial for maintaining engine performance and longevity.