Pontiac 1999 Grand Prix, Owner'S Manual

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DRIVE (D): This position is for normal driving. If you
need more power for passing, and you’re:
D Going less than 35 mph (55 km/h), push the
accelerator pedal about halfway down.
D Going about 35 mph (55 km/h) or more, push the
accelerator pedal all the way down.
You’ll shift down to the next gear and have more power.
NOTICE:
If the vehicle seems to start up rather slowly, or if it
seems not to shift gears as you go faster, something
may be wrong with a transaxle system sensor. If
you drive very far that way, the vehicle can be
damaged. So, if this happens, have the vehicle
serviced right away. Until then, you can use
SECOND (2) when you are driving less than
35 mph (55 km/h) and DRIVE (D) for
higher speeds.
THIRD (3): This position is also used for normal
driving, but it offers more power and lower fuel
economy than DRIVE (D).
Here are some times you might choose THIRD (3)
instead of DRIVE (D):
D When driving on hilly, winding roads.
D When towing a trailer, so there is less shifting
between gears.
D When going down a steep hill.
SECOND (2): This position gives you more power, but
lower fuel economy than THIRD (3). You can use
SECOND (2) on hills. It can help control your speed as
you go down steep mountain roads, but then you would
also want to use the brakes off and on.
NOTICE:
Don’t drive in SECOND (2) for more than
25 miles (40 km) at speeds over 55 mph
(88 km/h), or you can damage the transaxle. Use
DRIVE (D) or THIRD (3) as much as possible.
Don’t shift into SECOND (2) unless you are going
slower than 65 mph (105 km/h), or you can
damage the engine.