Idle Air Control (IAC) Valve

WARNING: This page is about a different car, the 2004 Mazda Tribute, 2003 Mazda Tribute, and 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Key symptom is elevated idle speed while noise is occurring.

NOTE: "Snapping" the throttle can induce the noise.

Open the hood.
Verify the condition by operating the vehicle for a short time.
Inspect the IAC. If physical evidence of contamination exists, install a new IAC.
While the noise is occurring, either place an EngineEAR 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.
Test the vehicle for normal operation.