Idle Speed: Adjustments

NOTE: Curb and fast idle speeds are controlled by the Powertrain Control Module (PCM) and Idle Air Control (IAC) valve assembly. The IAC valve and idle speed is not adjustable. A large increase or decrease in closed plate airflow from the calibrated level will not allow effective idle speed control.

Throttle Body Assembly:

Throttle bodies with sludge tolerant design are identified with a yellow/black decal. The throttle body must not be cleaned inside the bore, as this cleaning will impair the sensitive coating. Sludge accumulation will not affect the idle air flow. The cleaning procedure for the IAC valve still applies.

The throttle body assembly is not adjustable, if idle rpm is not 780 +/-50 rpm (engine warm, in Neutral, A/C "Off"), refer to Testing and Inspection / Procedures / Air Induction Diagnosis for other possible causes of idle problem. AIS - Air Induction Diagnosis