Diagnostic Aids

Check for the following conditions:

• Restricted air intake system.
• Proper operation and installation of all air intake components. Check for collapsed, clogged, or loose air intake ducts, a clogged air filter, and proper operation of mass airflow sensor.
• 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 valve 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, see INTERMITTENT TROUBLE CODE DETERMINATION  under SELF-DIAGNOSTIC SYSTEM.