If your 1997 Dodge Stratus is idling too high or too low, the problem isn't likely a simple adjustment. Instead, the cause is probably one or more of the following:
* Dirty or Faulty Throttle Body: A dirty throttle body can interfere with the sensor readings and cause erratic idle. Cleaning it is often the first step.
* Vacuum Leaks: Leaks in the vacuum lines can disrupt the system's ability to maintain the correct idle. These need to be located and repaired.
* Faulty Idle Air Control (IAC) Valve: The IAC valve regulates the amount of air entering the engine at idle. A faulty valve can cause idle problems. This may need replacement.
* Faulty Sensors: As mentioned, several sensors feed information to the PCM. A malfunctioning sensor (like the TPS, coolant temperature sensor, mass airflow sensor, etc.) will result in an incorrect idle. Diagnosis with a scan tool is needed to identify which sensor is failing.
* PCM Issues: In rare cases, the PCM itself could be faulty. This is less likely than the other problems.
To address a rough or incorrect idle on your 1997 Stratus:
1. Start with the easy stuff: Check for visible vacuum leaks and clean the throttle body thoroughly using throttle body cleaner. Make sure you disconnect the battery negative terminal before doing any cleaning around electrical components.
2. Obtain a Diagnostic Scan: Visit an auto parts store (like AutoZone, Advance Auto Parts) that offers free OBD-II code reading services. They can scan your car for any trouble codes stored by the PCM. These codes can help pinpoint the problem.
3. Professional Help: If you're not comfortable working on your car yourself, or if the scan reveals a more complex issue, take it to a qualified mechanic. They have the tools and expertise to diagnose and fix the underlying cause of the idling problem.
In short: There's no idle adjustment screw. Fixing an idle problem requires troubleshooting and likely replacing a faulty component.
