Idle Speed

CURB IDLE SPEED
Light Duty
Automatic/Manual 500 rpm

Heavy Duty
Automatic 500 rpm
Manual 600 rpm

A/C ON IDLE SPEED
Solenoid Extended 600 rpm

FAST IDLE SPEED
Light Duty
Automatic/Manual 1800 rpm (on high cam)

Heavy Duty
Automatic 1600 rpm (on high cam)
Manual 1300 rpm (on high cam)

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.