Chevrolet 2010 HHR Owner's Manual page 138

The shift lever should be in N (Neutral) and the parking
brake engaged. Hold the clutch pedal down to the floor
and start the engine. The vehicle will not start if the
clutch pedal is not all the way down.
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 the
engine warms. Do not race the engine immediately
after starting it. Operate the engine and
transmission gently to allow the oil to warm up and
lubricate all moving parts.
The vehicle has a Computer-Controlled Cranking
System. This feature assists in starting the engine
and protects components. If the ignition key is
turned to the START position, and then released
when the engine begins cranking, the engine will
continue cranking for a few seconds or until the
vehicle starts. If the engine does not start and the
key is held in START for many seconds, cranking
will be stopped after 15 seconds to prevent
cranking motor damage. 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 ACC/ACCESSORY
or LOCK/OFF.
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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.
Push the accelerator pedal all the way to the floor
and holding it there as you hold the key in START
for a maximum of 15 seconds. Wait at least
15 seconds between each try, to allow the cranking
motor to cool. When the engine starts, let go of the
key and accelerator. If the vehicle starts briefly but
then stops again, repeat the procedure. This clears
the extra gasoline from the engine. Do not race the
engine immediately after starting it. Operate the
engine and transmission gently until the oil warms
up and lubricates all moving parts.