Diagnostic Aids
WARNING: This page is about a different car, the 2004 Buick Regal. 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
- Restricted air intake system
- Proper operation and installation of all air intake components
- Collapsed, clogged, or loose air intake ducts
- A clogged air filter
- Proper operation of the mass air flow (MAF) sensor, if equipped
- A tampered with or damaged throttle stop screw
- A tampered with or damaged throttle plate, throttle shaft, or throttle linkage
- Objects blocking the IAC passage or throttle bore
- 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 low or unstable idle condition could be caused by a non-IAC system problem that can not be overcome by the IAC valve-Refer to Symptoms - Engine Controls .
If the problem is determined to be intermittent, refer to Intermittent Conditions .