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How do you adjust engine idle 1993 Chrysler new yorker?

The 1993 Chrysler New Yorker's idle speed isn't adjusted with a simple screw like older cars. It's controlled electronically by the Powertrain Control Module (PCM) based on various sensor inputs (temperature, throttle position, etc.). There's no user-adjustable idle speed screw.

If your 1993 New Yorker has an idle problem, don't try to adjust it yourself. Attempting to manually adjust something you shouldn't will likely cause more problems. Instead, you should focus on diagnosing the *cause* of the idle issue. Possible causes include:

* Dirty or faulty Idle Air Control (IAC) valve: This valve regulates airflow at idle. Cleaning it (with appropriate cleaner) is often the first step, but it may need replacement.

* Faulty Throttle Position Sensor (TPS): This sensor tells the PCM the throttle position. A faulty TPS can cause erratic idle.

* Vacuum leaks: Leaks in the intake manifold or vacuum lines can disrupt the engine's idle.

* Dirty Mass Air Flow (MAF) sensor: A dirty MAF sensor will give inaccurate readings to the PCM, affecting the idle.

* Failing PCM: While less common, a failing PCM can cause various problems, including idle issues.

* Problems with other sensors: The PCM uses many sensors to control the engine. A faulty sensor can affect the idle.

Troubleshooting steps:

1. Check for vacuum leaks: Visually inspect all vacuum lines and the intake manifold for cracks or loose connections. Use a vacuum gauge if you have one to confirm the presence of a leak.

2. Clean the IAC valve: This is usually accessible and can be cleaned with a special electronic parts cleaner. Consult a repair manual for the location and cleaning procedure. Don't use brake cleaner.

3. Check the MAF sensor: This usually requires professional cleaning equipment to avoid damaging the sensor. Replacement may be necessary.

4. Have the TPS checked: A malfunctioning TPS usually needs to be replaced, and it's best tested by a mechanic with the right tools.

5. Consider a diagnostic scan: A professional mechanic can use a scan tool to read diagnostic trouble codes (DTCs) from the PCM. This can pinpoint the source of the problem.

In short: Don't try to adjust the idle yourself. Instead, diagnose the underlying problem and have it repaired by a qualified mechanic or experienced DIYer with the proper diagnostic tools. Attempting to adjust the idle without understanding the system could cause serious damage.

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