Chevrolet 2005 T-Series Owner's Manual page 46

When the engine coolant temperature is
below 149°F (65°C) and the outside temperature is
below 50°F (10°C), the exhaust restrictor will come
on within 45 seconds of starting the engine. After
running the engine for an additional 45 seconds, the
engine idle will increase.
The exhaust restrictor will shut off and engine idle will
return to normal once the engine is warmed up, or
the transmission is shifted into range.
If Your Engine Will Not Start
If you are not out of fuel, and your engine will not start,
do this:
Turn your ignition key to ON. Immediately after the wait
to start light goes off, turn the ignition key to START.
If the light does not go off, wait a few seconds, then try
starting your engine again. And, see your dealer as
soon as you can for a starting system check.
If the light comes on and then goes off and you know
your batteries are charged, but your engine still will not
start, your vehicle needs service.
If the light does not come on when the engine is cold,
your vehicle needs service.
2-10
If your batteries do not have enough charge to start
your engine, see Battery on page 5-41 Battery for more
information.
Be sure you have the right oil for your engine, and that
you have changed the oil at the proper times. If you
use the wrong oil, your engine may be harder to start.
See Engine Oil on page 5-14 Engine Oil for more
information.
Be sure you are using the proper fuel for existing
weather conditions. See What Fuel to Use on page 5-6
What Fuel to Use.
If the engine starts, runs a short time, then stops, your
vehicle needs service.
CAUTION:
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Do not use gasoline or starting aids, such as
ether, in the air intake. They could damage
your engine. There could also be a fire, which
could cause serious personal injury.