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Pontiac 1998 Grand Prix Owner's Manual page 146

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If
so,
be sure to fuel your vehicle with quality fuel (see
"Fuel" in the Index). Poor fuel
quality
will
cause
your
engine not to
run
as efficiently as designed. You may
notice this as stalling after start-up, stalling when you
put the vehicle into gear, misfiring, hesitation on
acceleration or stumbling on acceleration. (These
conditions may go away once the engine is warmed up.)
This will be detected by the system and cause the light
to
turn
on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at
least one
full tank of the proper fuel to
turn
the light off.
If none of the above steps have made the light
turn
off,
have your dealer or qualified service center check
the
vehicle. Your dealer has the proper test equipment and
diagnostic
tools to
fix any mechanical
or
electrical
problems that may have developed.
Oil Warning Light
If you have a problem
w i t h
your oil pressure, this light
may stay on after you start
your engine, or come on
when you
are
driving.
This indicates that oil is not going through your engine
quickly enough to keep it lubricated. The engine could
be low on oil or could have some other oil problem.
Have it fixed right away.
The oil light could
also
come on
in
two other situations:
0
0
When the ignition is on but the engine is not running,
the light will come on as a test to show you it is
working, but the light
will
go out when you turn the
ignition to START. If it doesn't come on with the
ignition on, you may have a problem with the fuse or
bulb. Have
it
fixed right away.
If you make a hard stop, the light may come on for
a
moment. This is normal.
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