Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Idle Air Control (IAC) Valve Reset
If idle speed remains high and will not regulate down, reset IAC valve. To reset, run engine until normal operating temperature is reached. On 3.1L, reset is accomplished by placing transaxle in Drive for 2 minutes at idle.
On all other models, reset may be accomplished by grounding ALDL "test" terminal and operating engine at 2000 RPM, or by driving vehicle at a speed of 40 MPH for a few minutes to re-establish reference point between ECM and IAC valve. Ignition may have to be cycled on and off after above procedure to obtain proper idle.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.