octane PONTIAC FIREBIRD 1997 Owners Manual

You can be injured and your vehicle could be
damaged if you try to
do service work on a
vehicle without knowing enough about it.
Be sure you have sufficient knowledge,
experience, the proper replacement parts
and tools before you attempt any vehicle
maintenance task.
Be sure to use the proper nuts, bolts and
other fasteners. “English” and (‘metric”
fasteners can be easily confused.
If you use
the wrong fasteners, parts can later break
or fall off. You could be hurt.
Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your vehicle can
affect the airflow around it. This may cause wind noise
and affect windshield washer performance. Check with
your Pontiac dealer before adding equipment
to the
outside
of your vehicle.
Fuel
The 8th digit of your vehicle identification number
(VIN) shows the code letter for your engine. You will
find the
VIN at the. top left of your instrument panel.
(See “Vehicle Identification Number” in the Index.)
If you have the 3800 engine (VIN Code K), use regular
unleaded gasoline rated at
87 octane or higher.
If you have the 5.7L engine (VIN Code I?), use premium
unleaded gasoline rated at
91 octane or higher for best
performance. You may use middle grade or regular
unleaded gasolines, but your vehicle may not accelerate
as well.

At a minimum, the gasoline you use should meet
specifications
ASTM D4814 in the United States and
CGSB 3.5-M93 in Canada. Improved gasoline
specifications have been developed by the American
Automobile Manufacturers Association
(AAMA) for
better vehicle performance and engine protection.
Gasolines meeting the AAMA specification could
provide improved driveability and emission control
system protection compared to other gasolines,
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 still hear heavy knocking, your
engine needs service.
But dm9t 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 tune-up 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, b’ut 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 sctane-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 MMT 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.
6-4