Engine, 2.5 L (151 cu in) L4, throttle-body fuel injection

Years 1982–91 Models 3 Factory citations 6

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Also described as 2.5 L (151 cu in) L4, throttle-body fuel injectionEngine, 2.5L L4

Also documented for Buick Chevrolet Oldsmobile

Documented applications

6000 — A-body (1982–1991)

1982–1991 Factory-verified

Wikipedia's "Tech IV" four; 6000 years: Wikipedia 1982–1991 (6000 and Iron Duke articles); the 1986–1988 and 1990 kit pages print it only in single-condition pairing remarks inside other options' entries ("With RPO LR8 engine", "w/LR8"), which this doc does not use to date a year, so 1986–1988 and 1990–1991 rest on Wikipedia's table; shared A-body code; cited from the Chevrolet Celebrity kits

GM Heritage factory kit — 1983 Chevrolet Celebrity, p.6.
GM Heritage factory kit — 1984 Chevrolet Celebrity, p.8.
GM Heritage factory kit — 1985 Chevrolet Celebrity, p.15.
GM Heritage factory kit — 1989 Chevrolet Celebrity, p.10.

Fiero (1984–1988)

1984–1988 Single-source

VIN code R; years from the OSG transaxle and engine pages, which list the 2.5L L4 in every year; the rparts list adds throttle-body injection

Phoenix — X-body (1983–1984)

1983–1984 Single-source

the four-cylinder; matched to the Phoenix's unit by meaning: Wikipedia's Phoenix article names the 2.5 L Iron Duke four-cylinder but prints no code; shared X-body code; cited from the Chevrolet Citation kit, whose engine pages print it with its model year

GM Heritage factory kit — 1983 Chevrolet Citation, p.10.
GM Heritage factory kit — 1984 Chevrolet Citation, p.10.

This page aggregates every documented appearance of LR8 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.