Be sure the posted octane for premium is at least
91
(at
least
89
for middle grade and
87
for regular). If the
octane
is
less
than
87,
you may get a heavy knocking
noise when you drive. If it's bad enough, it can damage
your engine.
If you're using fuel rated at the recommended octane or
higher and you hear heavy knocking, your engine needs
service. But don't
worry
if
you hear a little pinging
noise when you're accelerating or driving up a
hill.
That's normal, and you don't have to buy a higher
octane
fuel
to get
rid
of pinging. It's the heavy, constant
knock that means you have a problem.
If
your vehicle is certified to meet California Emission
Standards (indicated on the underhood emission control
label),
it
is designed
to
operate on fuels that meet
California specifications. If such fuels are not available
in
states adopting California emissions standards, your
vehicle will operate satisfactorily on fuels meeting
federal specifications, but emission control system
performance may be affected. The malfunction indicator
lamp on your instrument panel may turn on and/or
your
vehicle may fail
a
smog-check test.
If
this
occurs,
return to
your
authorized Pontiac dealer for diagnosis
to
determine
the
cause of failure.
In
the event it is
determined that
the
cause of the condition is the type of
fuels used, repairs may not be covered by your warranty.
Some gasolines that are not reformulated for
low
emissions contain
an
octane-enhancing additive called
methylcyclopentadienyl manganese tricarbonyl (MMT);
ask your service station operator whether or not his fuel
contains
MMT.
General Motors does not recommend the
use of such gasolines.
If
fuels containing
"'I'
are used,
spark
plug life may be reduced
and
your emission
control system performance may be affected. The
malfunction indicator lamp on your instrument panel
may
turn
on.
If
this
occurs, return to your authorized
Pontiac dealer for service.
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