Third generation · Aero F-body · 1982–1992
1991Pontiac Firebird
A lighter, sharply aerodynamic redesign with pop-up headlights and a large hatchback glass; fuel injection arrived during the run and the convertible returned for 1989.
Photo: “1991 Pontiac Firebird (3758959420).jpg” by Robert Stinnett from St. Peters, Missouri, United States / Wikimedia Commons, licensed under CC BY 2.0. Cropped to 16:9.
Start here
What do you need to know?
This page covers the whole 1991 Pontiac Firebird model year. Choose your task first; exact trims and engines are separated where the factory offered different versions.
Documented lineup
Find your exact 1991 Firebird
Start with a family, body style, or engine. Every card opens the facts and maintenance information for that factory version.
Exact factory pairings documentedHow this lineup was verified
These source-backed records identify published body, engine, and transmission combinations. Exact pairings do not by themselves assert that every factory option or special edition is represented.
No factory configuration matches those filters.
The 1991 model year
Overview
Pontiac's 1991 factory literature documents Firebird, Firebird Formula, Trans Am, Trans Am GTA as the marketed Firebird models, with 4 distinct engine applications. This third-generation record keeps the model, engine, body, and transmission boundaries tied to the exact year instead of carrying adjacent-year options forward.
Specifications
- Engines
- 3.1L multi-port-injected V6
- 5.0L throttle-body-injected V8
- 5.0L tuned-port-injected V8
- 5.7L tuned-port-injected V8
- Transmissions
- Five-speed manual (application-dependent), Automatic (application-dependent)
- Body styles
- Two-door hatchback coupe
Year over year
What changed
- The verified 1991 roster contains 4 marketed model lines; appearance packages and engine options are not promoted as standalone models without a printed factory pairing.
- Engine and transmission availability changed repeatedly during the 1982–1992 generation, so this page does not reuse a neighboring year's service or ordering matrix.
Worth knowing
Notable
- The source-backed year-level inventory includes Firebird, Firebird Formula, Trans Am, Trans Am GTA without manufacturing unsupported trim-by-engine cross-products.
Living with it
Reliability & ownership notes
- Verify the VIN engine code, transmission, emissions label, body, and build date before ordering parts; shared displacement does not establish the induction system or service application.
- Inspect cooling, fuel and ignition systems, hatch or convertible seals, electrical accessories, collision repair, corrosion, and modification quality on any survivor.
Maintenance & service parts
Keep your 1991 Firebird on the road
Start with the service interval, then match the engine or exact version you own. Order links appear only when a catalog-backed part number is available, and every listing still needs a fitment check.
Service desk
What this car needs & when
Use this as a service-planning checklist for 1991 Pontiac Firebird. Start with the interval, confirm which engine or configuration you have, then use an exact ordering reference when one is verified.
- Service topics
- 6
- Factory intervals
- 5
- Fitment-scoped
- 6
- Exact references
- 1
Before orderingIdentify your engine, options and build date.Part numbers and sizes can change within one model year. Shopping links appear only for catalog-backed references; still verify the listing against your vehicle before ordering.
Engine oil and filter
Sourced interval available
Source: Pontiac — 1991 Firebird V8-305 5.0L VIN F FI factory normal-service schedule (preserved service-manual database) · Maintenance > Service Intervals > Normal Service — recurring 7,500-mile rows · checked
Spark plugs
Sourced interval available
Source: Pontiac — 1991 Firebird V8-305 5.0L VIN F FI factory normal-service schedule (preserved service-manual database) · Maintenance > Service Intervals > Normal Service — 30,000-mile row and repeating rows · checked
Engine air-filter element
Sourced interval available
Source: Pontiac — 1991 Firebird V8-305 5.0L VIN F FI factory normal-service schedule (preserved service-manual database) · Maintenance > Service Intervals > Normal Service — 30,000-mile row and repeating rows · checked
Engine coolant
Sourced interval available
Source: Pontiac — 1991 Firebird V8-305 5.0L VIN F FI factory normal-service schedule (preserved service-manual database) · Maintenance > Service Intervals > Normal Service — 30,000-mile row and repeating rows · checked
Automatic transmission fluid and filter
Sourced interval available
Source: Pontiac — 1991 Firebird V8-305 5.0L VIN F FI factory normal-service schedule (preserved service-manual database) · Maintenance > Service Intervals > Normal Service — 100,000-mile row · checked
Engine oil filter — catalog fitment
Exact reference available
Manufacturer-catalog fitment scoped to the exact engine row in the Firebird application table.
Baldwin B35-S cataloged fitment
This manufacturer application record establishes filter fitment only; it does not alter the separately sourced service schedule.
Source: Parker/Baldwin Filters — 2025 Automotive Applications catalog · PDF page 600, Pontiac 1991 Firebird V6-189 (3.1L), VIN T row — Lube — B35-S · checked
Verified ordering references
- Validated equivalentBaldwin B35-S
Qty. 1 · Engine lubricating-oil filter · catalog-listed
Cataloged for the 1991 Firebird V6-189 (3.1L), VIN T; verify engine code and installed dimensions.
Catalog: Parker/Baldwin Filters — 2025 Automotive Applications catalog · PDF page 600, Pontiac 1991 Firebird V6-189 (3.1L), VIN T row — Lube — B35-S · checked
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