- For 1990, Firebirds had a larger and more powerful base V-6.
- All TPI V-8s (standard in Trans Ams) had a speed density metering system.
- All Firebirds also had:
- an inflatable airbag restraint system
- a new self-adjusting parking brake
- dual body-color sport mirrors
- new instrument panel switches for the rear defogger
- rear hatch release
- fog lamps
- Brilliant Red Metallic was a new color replacing Flame Red.
- Base Firebirds had new seat and armrest trim, plus a different rear spoiler design.
- Standard features included
- a five-speed manual gearbox
- an FE1 suspension
- P215/65R15 tires
- front disc/rear drum brakes
- an AM/FM stereo with clock
- Hi-tech aluminum wheels (15 x 7 in.) were standard.
- The Formula model had more of a performance image.
- Its equipment list added
- an aero-style rear deck lid spoiler
- air conditioning
- tinted glass
- the WS6 sport suspension
- P245/50ZR16 tires
- a TBI V-8 engine
- The Formula's 6-in. deep-dish Hi-tech wheels had machined-finished faces and silver metallic ports.
- The Trans Am had
- a more powerful V-8
- an F41 handling suspension
- a limited-slip differential
- P215/65R15 Firehawk GTX tires
- 15-in. deep-dish Hi-tech turbo aluminum wheels with machined faces and charcoal metallic ports
- plus a leather appointment group
- The luxury version of the Trans Am was the GTA.
- Its standard features included
- a 5.7-liter TPI V-8
- a dual catalytic converter exhaust system
- a four-speed automatic transmission
- four-wheel disc brakes
- P245/50ZR-16 Goodyear performance tires
- 16x8 in. gold crosslace aluminum wheels
- leather-wrapped steering wheel
- articulating custom bucket seats with inflatable lumbar and lateral supports
- a rear defogger
- a cargo screen
- a full-featured Delco ETR AM/FM stereo cassette with equalizer
- a power antenna
- power side view mirrors
- power windows
- power door locks
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