Idle Speed

NOTE: Vehicles with a Gross Vehicle Weight Rating (GVWR) below 6000 lbs (8500 lbs for California), and passenger carrying vehicles with a capacity of 12 persons or less, are Light Duty Emissions Vehicles.

CURB IDLE SPEED
Light Duty
Automatic 550 rpm (High Altitude 600)
Manual 700 rpm

NOTE: California vehicles use Idle Speed Control (ISC). Idle speed is controlled by the Electronic Control Module (ECM).

Heavy Duty
Automatic 700 rpm
Manual 700 rpm

A/C ON IDLE SPEED
Manual 800 rpm
Automatic 650 rpm

FAST IDLE SPEED
Light Duty
Automatic
Federal 1600 rpm
California 1800 rpm
High Altitude 1400 rpm
Manual
Federal/California 1300 rpm
High Altitude 1400 rpm

Heavy Duty
Automatic/Manual 1900 rpm

NOTE: Measured on high cam step.