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:
- Restricted air intake system.
- Proper operation and installation of all air intake components, for example, a collapsed, clogged, or loose air intake ducts, a clogged air filter, proper operation of Mass Airflow (MAF) sensor, if equipped, etc.
- A tampered with or damaged throttle stop screw.
- A tampered with or damaged throttle plate, throttle shaft, or throttle linkage.
- Objects blocking IAC passage or throttle bore.
- Excessive deposits in IAC passage or on IAC pintle.
- Excessive deposits in throttle bore or on throttle plate.
- Vacuum leaks.
- A low 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.