Chevrolet 4500 HD 2023 Manual page 140

Starting the Engine
Do not keep the engine control switch in
the START position for more than about
10 seconds. Operating the starter for too
long might cause starter and battery failure
or may result in overheating.
When the engine does not start, wait for 20
to 30 seconds and then turn the engine
control switch again.
Before starting the engine sit in the driver
seat, check that the parking brake is firmly
engaged, the selector lever is in the P or N
(P is preferred) position and the shift
indicator also shows P or N, and firmly press
the brake pedal to start the engine.
When stopped on a slope, start the engine
with the selector lever in the P position. See
Ignition Positions 0 137.
1. Make sure that the selector lever is in
the P or N position and firmly press the
brake pedal.
2. When the engine control switch is
turned to the ON position, the
wait-to-start light comes on and it goes
out in about 1 second when the engine
is warm, to about 10 seconds when the
engine is cold.
3. After confirming that the wait-to-start
light has gone out, turn the engine
control switch to the START position to
start the engine. Release the engine
control switch as soon as the engine
starts.
4. Do not crank the engine for more than
10 seconds at a time. If the engine does
not start, wait 20 to 30 seconds with the
engine control switch in the LOCK or ACC
position before trying to start again.
It is normal for the vacuum warning buzzer
to sound for a few seconds after the engine
has started.
After the engine has started, check to be
sure the selector lever is still in the P
position.
This engine has an automatic warm-up
system that increases engine idle speed and
applies the exhaust brake. Allow sufficient
time to let the engine circulate lubricant oil
before driving. This usually requires
Driving and Operating
30 seconds to 2 minutes depending on
ambient conditions. See Brake System
Warning Light (Parking Brake Light) 0 54.
The turbocharged engine should be started
in a way which ensures the bearings
supporting the rotating parts of the
turbocharger are sufficiently lubricated. Do
not race a cold engine.
At low ambient temperatures, a cold engine
may emit more smoke than usual.
Do not drive the truck until the engine has
had sufficient time to circulate the lubricant
oil. This usually requires 30 seconds to
2 minutes depending on ambient conditions.
This will help reduce white start-up smoke.
Preheating : Diesel engines are compression
ignited, which makes them difficult to start
when they are cold because the compression
alone cannot create a temperature high
enough for fuel to ignite.
Preheating means warming the compressed
air inside the combustion chambers to
facilitate engine starting. Be sure to start
the engine after the wait-to-start light has
gone out.
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