Therefore, there's no "idle adjustment" you can tweak yourself. If your Caravan is idling too high or too low, the problem likely lies within the following:
* Idle Air Control (IAC) Valve: This is the most common culprit. It's a motorized valve that regulates air flow at idle. It might be dirty, sticking, or failing.
* Throttle Position Sensor (TPS): A faulty TPS can send incorrect signals to the PCM, leading to incorrect idle speed.
* Mass Airflow Sensor (MAF) Sensor: Similar to the TPS, a malfunctioning MAF sensor provides inaccurate air flow readings to the PCM affecting the idle.
* Vacuum Leaks: Leaks in the vacuum system can cause erratic idling.
* PCM Issues: In rare cases, the PCM itself might be malfunctioning.
To fix an idle problem, you'll need to have a mechanic diagnose the issue using a scan tool to check for trouble codes. Replacing the IAC valve is often a relatively easy fix if that's the problem, but other issues may require more extensive diagnostics and repairs. Trying to adjust something you can't see or access will likely cause more problems.
