Diagnostic Aids
WARNING: This page is about a different car, the 2003 Saturn Ion 3, 2003 Saturn Ion 2, and 2003 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for the following conditions:
- High resistance in an IAC valve control circuit.
- Correct Positive Crankcase Ventilation (PCV) valve, properly installed and proper operation of PCV valve (if equipped).
- Proper operation and installation of all air intake components.
- Proper installation and operation of the Mass Airflow (MAF) sensor, if equipped.
- Tampered with or damaged throttle stop screw.
- A misadjusted throttle cable.
- A skewed high Throttle Position (TP) sensor.
- Excessive deposits in the IAC passage or on the IAC pintle.
- Excessive deposits in the throttle bore or on the throttle plate.
- Vacuum leaks.
- A high or unstable idle condition could be caused by a non-IAC system condition that can not be overcome by the IAC valve.
- If the condition is determined to be intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L ION article.