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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.

    Source document

    docs/rpo/cadillac/eldorado-e-body-1986.md

    Interactive view →

    Rendered verbatim from the reference. Factory citations shown as ⛭ GM Heritage — …. For filtering, badges, and crosslinks, use the interactive Eldorado — E-body (1986–1991) page.

    Cadillac Eldorado — E-body (eleventh generation) (1986–1991)

    Wikipedia gives the eleventh-generation Eldorado as model years 1986 to 1991, a two-door coupe assembled at Detroit/Hamtramck, with the 4.1L HT-4100 V8 in 1986–1987, a 4.5L V8 in 1988–1990 and the 4.9L L26 V8 in 1991, behind a 4-speed automatic. The NICB manuals list the Eldorado in the 1986 to 1991 tables. No GM order guide, data book, Heritage kit or RPO list for this Eldorado is in the archive, and the brief names no Chevrolet twin kit, so only two codes are listed, both engines and both single-source: the 1986–1987 HT-4100 (LT8) and the 1991 engine (L26). Wikipedia names no RPO code for the 1988–1990 4.5L engine or for the transmissions, and no source read ties any transmission, axle, package, paint or trim code to this Eldorado with a year.

    Codes

    Engines

    Code Description Years Models/Notes Confidence
    LT8 Engine, 4.1L V8, High Technology HT-4100 1986–1987 Wikipedia's Eldorado article names the HT-4100 V8 for 1986–1987 in the eleventh-generation infobox, and its Cadillac High Technology engine article gives LT8 as the HT-4100's option code and lists the Eldorado (the two articles are one source); no Buick or Oldsmobile E-body used this engine, so there is no sibling source single-source
    L26 Engine, 4.9L V8, multiport fuel injection 1991 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 single-source

    Sources

    Factory documents (T1)

    No Cadillac factory document for the 1986–1991 Eldorado is in docs/factory-docs/ or docs/heritage-ocr/, and the brief lists no Chevrolet twin kit; no row cites a factory page.

    Other sources

    • https://en.wikipedia.org/wiki/Cadillac_Eldorado — eleventh-generation section: model years, Hamtramck, engines by year, L26 for 1991 (retrieved 2026-11-05 as wikitext, action=raw)
    • https://en.wikipedia.org/wiki/Cadillac_High_Technology_engine — 4.1, 4.5 and L26 4.9 application lists (retrieved 2026-11-05 as wikitext; a second Wikipedia article, not an independent source)
    • https://decoderpo.com/pages/L/2 — GM-wide code dictionary (T3), no vehicle or year; used to check the meaning of L26 only (retrieved 2026-11-05)
    • NICB Passenger Vehicle Identification Manual, GM sections (T4): docs/reference/nicb/nicb1986-gm.txt p. 39, nicb1987-gm.txt, nicb1988-gm.txt, nicb1989-gm.txt, nicb1990-gm.txt and nicb1991-gm.txt p. 36 — Eldorado car-line name (the OCR text is garbled and carries no page numbers except where the brief gives them)