underneath the drivers door
check under the driver's side, on the fuel line, somewhere near the tank.
It is listed in the 1991 Pontiac Firebird Operations Manual
Roughly 4.5 quarts with a filter change.
It's under the car in the middle in front of the fuel tank
Inside the alternator.
What parts??? Body, engine, suspension???
Typically above the rear axle, or alongside the "subframe" in front of the left rear wheel, under the car. It will be the size of a 12oz soda can.
I calc'ed my '91 V8 Formula Firebird to be about 18 mpg.
i know the backs are 6x9
A firebird can't "have" third gen. It either is or is not a third generation firebird, and Yes, a 1991 is a third generation.
The 1991 Pontiac Grand Prix oxygen sensor is located on the outside of the air filter housing. You will find the sensor on the back side of the air filter housing.
It is in the ducting before the throtle body.