Starting Your V8 Engine - GMC Sierra 2005 Owner's Manual

Starting Your V8 Engine

1. With your foot off the accelerator pedal, turn the
ignition key to START. When the engine starts,
let go of the key. The idle speed will go down as
your engine gets warm.
Notice: Holding your key in START for longer
than 15 seconds at a time will disengage the starter
motor, cause your battery to be drained much
sooner, and add excessive heat that can damage
your starter motor. Try not to hold the key in
START for longer than 15 seconds and wait about
15 seconds between each try to help avoid draining
your battery or damaging your starter.
2. If it does not start within 10 seconds, push the
accelerator pedal all the way to the floor, while
you hold the ignition key in START. When
the engine starts, let go of the key and let up
on the accelerator pedal. Wait about 15 seconds
between each try.
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When starting your engine in very cold weather
(below 0°F or −18°C), do this:
1. With your foot off the accelerator pedal, turn
the ignition key to START and hold it there up
to 15 seconds. When the engine starts, let go
of the key.
2. If your engine still will not start, or starts but then
stops, it could be flooded with too much gasoline.
Try pushing your accelerator pedal all the way to
the floor and holding it there as you hold the key
in START for about three seconds. When the
engine starts, let go of the key and accelerator.
If the vehicle starts briefly but then stops again,
do the same thing, but this time keep the pedal
down for five or six seconds. This clears the extra
gasoline from the engine.
Notice: Your engine is designed to work with the
electronics in your vehicle. If you add electrical
parts or accessories, you could change the way the
engine operates. Before adding electrical equipment,
check with your dealer. If you do not, your engine
might not perform properly. Any resulting damage
would not be covered by your vehicle's warranty.