Diagnostic Aids
WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for the following conditions:
- Correct Positive Crankcase Ventilation (PCV) valve, properly installed and proper operation of PCV valve.
- Proper operation and installation of all air intake components.
- Proper installation and operation of Mass Airflow (MAF) sensor.
- A tampered with or damaged throttle stop screw.
- A tampered with or damaged throttle plate, throttle shaft, throttle linkage, or cruise control linkage (if equipped).
- A skewed high TP sensor.
- Excessive deposits in IAC passage or on IAC pintle.
- Excessive deposits in throttle bore or on 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 IAC valve.
- If condition is determined to be intermittent, seeINTERMITTENT TROUBLE CODE DETERMINATION under ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.