V6 IDLE SPEED
NOTE:Idle speed is controlled by PCM and is not adjustable. Slight fluctuations in idle speed are considered normal. Start and run engine for at least 7 minutes to establish PCM control of idle.
3.1L, 3.4L, 3.5L, 3.8L & 4.0L
Idle speed is PCM-controlled. Resetting of IAC valve pintle is the only adjustment that can be performed. To reset IAC valve pintle position, turn ignition on.
Turn ignition off for 10 seconds. Start engine and check for proper idle operation. Repeat procedure if proper idle operation is not obtained.
Check following items:
Ensure throttle linkage and/or TP sensor is not sticking or binding. Ensure throttle bore is free of foreign material.
Check for vacuum leaks.
Check engine idle speed (both base idle and PCM idle).
Check Idle Air Control (IAC) system. Check for vacuum leak or high idle. Check for water contaminated fuel, correct fuel pressure or a restricted injector
Check for proper spark plug gap, and check engine compression.
Check PCM grounds for clean and tight connections.
Check exhaust system for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter
Sunday, October 24th, 2010 AT 8:40 PM