Engine, 2.3L L4, DOHC, fuel injection (Quad 4)

Oldsmobile-built, 150 hp in 1988–1989 and 160 hp from 1990; Wikipedia's Quad 4 engine article lists the Cutlass Calais under LD2 for 1988–1991 and says the engine reached production on the 1988 Calais; the Calais article says the Quad 4 was available on all models from 1988 and lists it from 1987 (1987 is left out because the Quad 4 article dates the engine's introduction to the 1988 model year); not independent of each other; the description says fuel injection without the multiport wording because the Quad 4 article gives no more detail (the merged Pontiac Grand Am doc reads its Quad 4 rows as multiport fuel injection)

160 hp; Wikipedia's Cutlass Supreme engine table prints LD2 for 1990–1991; the W-Body Page dates the Quad 4 1990–1991 without a code; the merged calais-n-body doc words LD2 "2.3 L L4, DOHC, fuel injection (Quad 4)" for that car, while Wikipedia's Cutlass Supreme table calls this engine I4; no listed kit page prints it