Poor Idle Quality
FAULT INDICATIONSIdle speed uneven, too high, or too low.
FAULT TRACING CONDITIONS
Before fault tracing, ensure that:
^ No diagnostic trouble codes are present,
^ The engine is at operating temperature, and
^ All fuses are clean and intact.
UNEVEN IDLE SPEED
^ Intake air leakage
^ Blocked injectors, Testing and Inspection
^ Faulty sensor signals
IDLE SPEED TOO HIGH
^ Faulty idle air control valve
^ Faulty DME Control Module
Computers and Control Systems
IDLE SPEED TOO LOW
^ Intake air leakage
^ Throttle body incorrectly adjusted
^ Faulty idle air control valve