Ford 2003 Mustang Owner's Manual page 103

Starting
Important safety precautions
A computer system controls the engine's idle
revolutions per minute (RPM). When the engine
starts, the idle RPM runs faster to warm the engine.
If the engine idle speed does not slow down
automatically, have the vehicle checked. Do not
allow the vehicle to idle for more than ten minutes
at the higher engine RPM.
Before starting the vehicle:
1. Make sure all vehicle occupants have buckled
their safety belts. For more information on safety
belts and their proper usage, refer to the Seating
and safety restraints chapter.
2. Make sure the headlamps and vehicle accessories
are off.
3. Make sure the
parking brake is set.
4. Make sure the
P R N D D 1
gearshift is in P (Park).
5. Turn the key to 4
3
2
(ON) without turning
the key to 5 (START).
4
1
5
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