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valves, and injector nozzles. Also, the
unburned fuel can enter the crankcase,
diluting the oil and causing rapid wear to the
engine.
If the engine is allowed to idle or the truck is
driven on low engine speed drive cycles for
more than 2 hours, the system will automat
-
ically enter an emissions operating mode
that will increase the engine idle speed to
900 RPM (1050 RPM for Chassis Cab).
While in this mode, which is designed to help
maintain the diesel particulate filter, the
engine idle speed will return to normal when
the brake pedal is applied. A small change in
engine tone or a slight change in engine
performance while accelerating may also be
noticeable at speeds below 20 mph
(32 kmh). This operating mode may last for
up to an hour of idle time, or around
20 minutes of driving time.
Your truck may have been ordered with an
optional voltage monitoring idle up feature.
If a load is placed on the electrical system
while the truck is in park, this feature will
attempt to maintain normal system voltage
by automatically increasing engine idle
speed. You may notice several consecutive
increases in idle speed, up to a maximum of
1450 RPM, as the system will attempt to
utilize the smallest increase in idle speed
necessary to maintain normal system
voltage. The idle speed will return to normal
when either the electrical load is removed, or
when the brake pedal is applied.
NOTE:
For instrument cluster display messages
related to the vehicle's exhaust system, refer
to “Instrument Cluster Display” in “Getting
To Know Your Instrument Panel” for further
information.
Idle-Up Feature
The driver-controlled high idle speed feature
will help increase cylinder temperatures and
provide additional cab heat, however, exces
-
sive idling may still cause the exhaust after
-
treatment system to not properly regenerate.
Extended periods of idle time should be
avoided.
The Idle-Up feature uses the speed control
switches to increase engine idle speed and
quickly warm the vehicle's interior.
1. With the transmission in PARK, the
parking brake applied, and the engine
running, push the speed control switch to
the ON position, then push the SET
switch.
2. The engine RPM will go up to 1100 RPM.
To increase the RPM, push and hold the
ACCEL/RESUME switch and the idle
speed will increase to approximately
1500 RPM. To decrease the RPM, push
and hold the DECEL switch and the idle
speed will decrease to approximately
1100 RPM.
3. To cancel the Idle–Up feature, either
push the CANCEL switch, push the ON/
OFF switch, or press the brake pedal.
Noise
Diesel engines can create noises that may
seem concerning. The nature of a diesel
engine is compression ignition where
compressed air and fuel are mixed and
ignited. Weather, barometric pressure, alti
-
tude, and temperature will affect how fuel is
ignited in the engine. Engines will sound
different from day to day or previous model
years. Clicking, ticking, or light knocking is
normal and will change from day to day, as
the engine breaks in, and can vary with
changes in ambient temperature. Clicking
sound from under the hood shortly after
vehicle shutdown is normal as actuators
such as the EGR valve are cycled. Fuel pump
noise may increase during low speed/light
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Summary of Contents for 2500 2019
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