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Your vehicle is equipped with a turbo speed limiter, this
feature limits the engine speed to 1,200 RPM when
engine coolant temperatures are below 70°F (21°C). This
feature is designed to protect the turbo charger from
damage and will only operate in PARK or NEUTRAL.
If temperatures are below 32°F (0°C), operate the engine
at moderate speeds for five minutes before full loads are
applied.
NOTE:
•
If ambient temperatures are low and the coolant
temperature is below 180°F (82°C), the engine idle
speed will slowly increase to 1,000 RPM after two min-
utes of idle, if the following conditions are met:
•
foot is off brake pedal and throttle pedal
•
automatic transmission is in PARK
•
vehicle speed is zero
•
Applying the throttle will cancel fast idle
•
If the engine is equipped with an exhaust brake,
operating the exhaust brake at idle will greatly im-
prove warm up rate and will help keep the engine
close to operating temperature during extended idle.
Engine Idling
Avoid prolonged idling, long periods of idling may be
harmful to your engine because combustion chamber
temperatures can drop so low that the fuel may not burn
completely. Incomplete combustion allows carbon and
varnish to form on piston rings, engine 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 for extended periods, the
engine speed may increase for a period of time and then
return to normal idle speed.
STARTING AND OPERATING 47
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