If you're having idle problems, the issue is *not* likely a setting you can change. The problem lies with either:
* The IAC valve itself: It might be malfunctioning (dirty, sticking, or failing internally). Cleaning it is often a first step in troubleshooting, but replacement might be necessary.
* The PCM: The computer might be sending incorrect signals to the IAC. This is less likely but possible. A diagnostic scan tool is needed to check for trouble codes.
* Other engine sensors: Problems with the throttle position sensor, mass airflow sensor, or other sensors could cause the PCM to command the IAC incorrectly.
Instead of looking for a "setting," you should diagnose the underlying problem. A mechanic or a scan tool capable of reading OBD-II trouble codes will be necessary to determine the root cause of your idle issues.
