Engine, 3.8L V6, multiport fuel injection, high output

Years 1977–81, 1987–88 Models 2

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Also described as 305 2-bbl V8 (Chevrolet)

Also documented for Buick Chevrolet Oldsmobile

Documented applications

Firebird / Trans Am

1977–1981 Single-source

Base/Esprit; on corporate lists — Firebird-specific citation thin

Bonneville — Eighth generation (1987–1991)

1987–1988 Confirmed

150 hp, the only engine at launch (VIN 3); Wikipedia's Bonneville infobox lists it for 1987–1988 and its Buick V6 engine article lists the Bonneville under LG3 for 1987 to early 1988 and says the LG3 was still available in some models after the LN3 arrived, while the Bonneville text says the LN3 replaced it for 1988, a mid-year changeover, so 1987–1988 is claimed and the two codes overlap in 1988; the Bonneville Club list prints the code and its meaning but no year; Wikipedia's infobox calls the fuel system SFI, the Bonneville Club list prints MFI

This page aggregates every documented appearance of LG3 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.