Blue Bird Coachworks 450 LXi, Owner'S Manual

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450 LXi Owner Manual 5-1 Engine Operation
Rev. “C”
~ 5-1-27 ~
5-1.13 Engine Operation
5-1.13.1 Engine Operation
Proper operation, driving techniques and maintenance are key factors in obtaining the maximum service life and economy
of Caterpillar engines. The recommendations in this manual will help to lower operating costs. For more information see your
Caterpillar dealer.
5-1.13.2 Idling
Idle speed is adjustable on Caterpillar electronic engines. Consult your Caterpillar dealer for information. The idle rpm is
preset at 600 rpm.
Avoid excess idling. If the vehicle is parked for more than fi ve minutes, stop the engine. An engine can burn from 2.8 L (.7
US gal) to 5.7 L (1.5 US gal) of fuel per hour while the engine is idling. Excessive idling can cause carbon buildup and/or
excessive idling can cause the engine to slobber. This is harmful to the engine.
If extended idle time is required, control the engine rpm to 1000 rpm or above 1000 rpm. Ensure that the coolant
temperature exceeds 82°C (180°F) Consult your Caterpillar dealer for assistance.
Fast idle can be programmed within the range of 700 rpm to the top engine limit. Fast idle requires an “ON/OFF” switch on
the dashboard. Consult your Caterpillar dealer for assistance.
5-1.13.3 Idle Shutdown Timer
The idle shutdown timer can be programmed in order to shut down the engine after a specifi c time period of idling. The idle
time can be programmed from three minutes to 1440 minutes (24 hours). If the idle shutdown timer is set to 0 minutes,
the idle shutdown feature is disabled. If the setting of the timer is unknown, allow the engine to idle. Observe the time that
elapses before the engine shuts down. The following conditions must be met in order to activate the idle shutdown timer:
The idle shutdown feature must be selected.
No vehicle speed is detected by the Electronic Control Module (ECM).
The engine is not under load.
The engine is at operating temperature. The engine is not in Cold Mode.
After the vehicle is stationary, the idle shutdown timer begins. The engine can be operating at low idle or at an idle or at an
idle rpm that is selected by the idle governor. The “
CHECK ENGINE/DIAGNOSTIC ” lamp will fl ash rapidly for 90 seconds prior
to shutdown. Movement of the vehicles automatically resets the idle shutdown timer to the programmed setting.
The following conditions must be met in order to override the idle shutdown timer:
Program the “ALLOW IDLE SHUTDOWN OVERRIDE” to “YES”.
The “CHECK ENGINE/DIAGNOSTIC” lamp will fl ash rapidly for 90 seconds prior to shutdown. Depress the service
brake or the clutch pedal during the 90 seconds when the “CHECK ENGINE/DIAGNOSTIC” lamp fl ashes.
After an idle shutdown, the engine can be restarted without turning the ignition switch to the OFF position.
The override function is disabled if the “ALLOW IDLE SHUTDOWN OVERRIDE” is programmed to “NO”.
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