GMC 2006 Sierra 1500 Pickup Owner's Manual page 118

Manual Transmission
The gear selector should be in neutral and the parking
brake engaged. Hold the clutch pedal to the floor and
start the engine. Your vehicle will not start if the clutch
pedal is not all the way down — that is a safety feature.
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.