Engine, 4.9L V8, multiport fuel injection

200 hp; Wikipedia's High Technology engine article heads the 4.9 section with the code L26 and lists the DeVille among its applications for every year of this span, and its DeVille article introduces the 4.9L for 1991; decoderpo.com (T3, undated, no vehicle) reads L26 as a 4.9L V8 with multiport fuel injection, which agrees on the meaning only; both articles are Wikipedia, one source

Wikipedia's Eldorado article names the L26 4.9L V8 as the 1991 engine and says 1991 brought Cadillac's 4.9 liter port fuel injection V8, and its Cadillac High Technology engine article lists the Eldorado under L26 (the two articles are one source); decoderpo.com's GM-wide dictionary reads L26 as the 4.9L (4.9B) V8 with multiport fuel injection but names no vehicle or year (it also prints a second, 3.8L V6 sequential fuel injection reading for L26, which is no Cadillac meaning), so it checks the meaning only; no Cadillac-specific source prints the code beyond Wikipedia

Wikipedia's High Technology engine article heads the 4.9 section with the code L26 and lists the Fleetwood among its applications for 1991–1992, and its Fleetwood article says the displacement rose to 4.9L for 1991; decoderpo.com (T3, undated, no vehicle) reads L26 as a 4.9L V8 with multiport fuel injection, agreeing on the meaning only; the Wikipedia articles are one source; single-source

Wikipedia's engine table lists the L26 HT4900 SFI V8 at 200 hp for 1991; the same article's text says the V8 grew to 4.9L for 1991 with a 4T60E transmission

SLS 1992–1993 and STS 1992; the Wikipedia engine article lists the same engine in the Eldorado in the same years. The engine article's Seville list ends in 1993, as does the Seville article [Wikipedia: Cadillac Seville; Cadillac High Technology engine]