2008 Ford F450 Diesel Supplement 4th Printing - Page 6

2008 Ford F450 Manual

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Introduction Engine governed speed The engine governor is controlled by the PCM. The PCM controls fuel input to limit maximum engine speed. It will not, however, prevent engine overspeeding resulting from downshifting at high vehicle speed or by descending steep grades at too high a vehicle speed for the selected transmission gear. If your vehicle is equipped with a manual transmission, refer to Manual transmission shift speeds in the Driving chapter of your Owner's Guide for maximum vehicle shift speeds in various gears. Do not exceed 4,000 rpm. Maximum engine governed speed is 3,700 rpm. Excessive rpm can only be achieved by manually downshifting at too high of a vehicle speed. Operating the engine beyond the governed speed can cause severe engine damage. Speed control (F-Super Duty) If vehicle speed goes outside a predetermined range from the set speed, the RES (Resume) function will not reset vehicle speed. Vehicle speed will need to be reset with the SET +/- button after reaching desired speed using accelerator pedal. 6

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Engine governed speed
The engine governor is controlled by the PCM. The PCM controls fuel
input to limit maximum engine speed. It will not, however, prevent
engine overspeeding resulting from downshifting at high vehicle speed or
by descending steep grades at too high a vehicle speed for the selected
transmission gear.
If your vehicle is equipped with a manual transmission,
refer to
Manual transmission shift speeds
in the
Driving
chapter of your
Owner’s Guide
for maximum vehicle shift speeds in various gears. Do
not exceed 4,000 rpm. Maximum engine governed speed is 3,700 rpm.
Excessive rpm can only be achieved by manually downshifting at too
high of a vehicle speed.
Operating the engine beyond the governed speed can cause
severe engine damage.
Speed control (F-Super Duty)
If vehicle speed goes outside a predetermined range from the set speed,
the RES (Resume) function will not reset vehicle speed. Vehicle speed
will need to be reset with the SET +/- button after reaching desired
speed using accelerator pedal.
Introduction
6