Pontiac 2007 G6 Owner's Manual page 126

To prevent gear damage, this system also
prevents cranking if the engine is already
running. Engine cranking can be stopped by
turning the ignition switch to the ACC or OFF
position.
Notice: Cranking the engine for long periods of
time, by returning the key to the START position
immediately after cranking has ended, can
overheat and damage the cranking motor,
and drain the battery. Wait at least 15 seconds
between each try, to allow the cranking motor to
cool down.
2. If the engine does not start after 5-10 seconds,
especially in very cold weather (below 0°F
or 18°C), it could be flooded with too much
gasoline. Try pushing the accelerator pedal all
the way to the floor and holding it there as you
hold the key in START for up to a maximum of
15 seconds. Wait at least 15 seconds between
each try, to allow the cranking motor to cool
down. When the engine starts, let go of the
key and accelerator. If the vehicle starts briefly
but then stops again, do the same thing.
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This clears the extra gasoline from the engine.
Do not race the engine immediately after
starting it. Operate the engine and transaxle
gently until the oil warms up and lubricates
all moving parts.
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.