GM Service Manual Online
For 1990-2009 cars only

High Idle System with Switch


Object Number: 1865785  Size: A2

If your vehicle has this feature, the manual high idle switch is located in the instrument panel switchbank.

This system can be used to increase your engine idle speed whenever the following conditions are met:

    • The brake pedal is not pressed.
    • The vehicle is at a complete stop.
    • The manual transmission (if equipped), clutch pedal is not pressed or, the automatic transmission (if equipped) is in NEUTRAL (N) or PARK (P).

The manual high idle feature is activated by pressing the switch on the instrument panel. When the switch is pressed again, or any of the previous conditions are not met, manual high idle will be deactivated.

The manual high idle has been preset at the factory. Your dealer may change the setting to fit your needs.

To set a new temporary engine idle speed:

  1. Make sure all of the previously described conditions are met.
  2. Press the accelerator pedal to the desired engine speed.
  3. Momentarily press the manual high idle switch.

The temporary high idle speed will be set. This new high idle rpm level will be remembered by the system until either the ignition is turned to OFF or a new high idle speed is set.

Automatic High Idle System

The automatic high idle feature will engage whenever you start your vehicle and the engine is below the preset operating temperature. This will help decrease engine warm-up time.

Idle speed will then return to normal when the engine reaches the preset operating temperature or has been operating for at least ten minutes.