Cadillac for 1983 heralded a new line of electronic fuel-injected engines, eliminating the carburetor. The EFI lineup even included the 2.0-liter four that powered Cimarrons. Once again, the HT-4100 V-8 was Cadillac's standard engine (except on Cimarrons and limousines), now with 10 more horsepower. Automatic four-speed overdrive transmission was standard as well. The 5.7-liter diesel was available again.
A new Freedom II battery gave better cold-cranking performance. The curious but undependable variable-displacement V8-6-4 engine was consigned only to limousine applications.
Added to the Eldorado and Seville option lists was a Delco-GM/Bose Symphony Sound System with four amplifiers and speakers in separate enclosures, billed as the "industry's most advanced stereo." Sound was automatically balanced for all passengers, reflecting off the windows and interior. Acoustics were based on window location and shape, upholstery, carpeting, and position of driver and passengers. The system included an AM/FM stereo radio and integral cassette player with Dolby tape noise reduction and full-time loudness control. Tested with an "acoustically-sensitive" robot, the system was also offered on Buick Riviera and Olds Toronado.
| All Cadillacs again had a 17-symbol Vehicle Identification Number (VIN), stamped on a metal tag attached to the upper left surface of the cowl, visible through the windshield. |
| The number begins with a "1" to indicate the manufacturing country (U.S.A.), followed by a "G" for General Motors and a "6" for Cadillac Division. |
The next letter indicates restraint system:
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Symbol five is a letter denoting car line and series:
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Digits six and seven indicate body type:
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Next comes an engine code:
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| The next symbol is a check digit |
| Symbol ten indicates model year ("D" 1983) |
Symbol eleven denotes assembly plant:
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| The final six-digit production sequence number began with 100001 for Detroit-built models: 600001 (Eldorado) or 680001 (Seville) for those built in New Jersey |
| An identification number for the V-6 engine was on the left rear of the block; on the V8-350, a code label was on top of the left valve cover and a unit number label atop the right valve cover. |
| Other engines had a unit number on the block behind the left cylinder head, and a VIN derivative on the block behind the intake manifold. |
| A body number plate on the upper horizontal surface of the shroud (except Seville, on front vertical shroud surface) showed model year, build date code, car division, series, style, body assembly plant, body number, trim combination, paint code, modular seat code, and roof option. |
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