Diagnostic Aids

Inspect for the following conditions:

• Skewed high TP sensor.
• Restricted air intake system.
• Objects blocking IAC passage or throttle bore.
• 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 Mass Air Flow (MAF) sensor (if equipped).
• Tampered with or damaged throttle stop screw.
• Tampered with or damaged throttle plate, throttle shaft, throttle linkage, or cruise control linkage (if equipped).
• Excessive deposits in IAC passage or on IAC pintle.
• Excessive deposits in throttle bore or on throttle plate.
• Vacuum leaks
• Excessive engine load caused by faulty transmission, power steering, alternator, etc.
• High or unstable idle condition caused by a non-IAC system problem that can not be overcome by IAC valve.
• Low or unstable idle condition caused by a non-IAC system problem that can not be overcome by IAC valve.