Idle Speed

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

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

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

Heavy Duty
Automatic/Manual 1900 rpm

NOTE: All fast idle speeds are measured with the fast idle cam on the high step.