GMC T-Series 2007, Owner'S Manual, Page: 70 / 356

High Idle System
Manual High Idle System
If your vehicle has this
feature, the manual high
idle button is located
in the instrument panel.
See Instrument Panel
Overview on page 100
Instrument Panel
Overview for more
information.
This system can be used to increase your engine
idle speed whenever the following conditions
are met:
•
The brake pedal is not pressed.
•
The vehicle is at a complete stop.
•
The manual transmission clutch pedal is not
pressed or, the automatic transmission is in
NEUTRAL (N) or PARK (P).
The manual high idle feature is activated by
pressing the button on the instrument panel.
When the button is pressed again, or any of the
previous conditions are not met, manual high
idle will be deactivated.
Exhaust Restrictor
If your vehicle is equipped with this feature,
there is an exhaust restrictor valve located in
the exhaust stream. The valve closes to provide
back pressure to the engine for the purpose
of warming the engine quickly.
The exhaust restrictor operates:
•
while the engine is running.
•
while the vehicle is not moving.
•
while the accelerator, brake and clutch pedals
are not pressed on a manual transmission
vehicle.
•
while idling in cold temperatures.
•
when the shift lever is in NEUTRAL (N) or
PARK (P) on an automatic transmission
vehicle.
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