Cadillac Deville History 1991

Cadillac Deville Models & History 1991

Sedan DeVille 1991

Last year the deVille series was a sedan and a coupe, but this year there was also a touring sedan.

All three had the new 4.9-liter V-8 engine which was linked to the 4T60-E electronically controlled four-speed automatic transmission with overdrive.

An improved version of the Teves anti-lock braking system was also now standard equipment.

Other new standard features of the deVille series included structural enhancements for improved crash-worthiness, 15-inch cast aluminum wheels, and a larger, higher capacity front braking system.

Sedan DeVille 1991

Computer Command Ride was optional and offered three damping modes to enhance ride and handling characteristics.

Formerly optional, but made standard equipment in 1991 were side and decklid accent striping, rear window defogger with heated outside mirrors.

Twilight Sentinel and automatic door locks including a new central door unlocking system.

Appearance-wise, the deVille featured a new power dome hood, wider grille with grid design and integral Cadillac script, revised front bumper guards and rear bumper rub strip, and a 4.9 Port Fuel Injection V8 decklid emblem.

Inside, EZ-Kool solar-control glass for all windows was made standard, Esteem seat cloth replaced the previously used Primavera, and an engine oil life indicator became standard.

A Phaeton roof was optional for the Sedan deVille while both a Cold Weather Package and a Security Package were also new options. The former included a heated windshield system and engine block heater while the latter featured remote keyless entry. illuminated entry and a theft-deterrent system.


The 1991 Cadillac 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 code was as follows:
The first digit “1,” represented the manufacturing country (United States)
The second, “G” represented General Motors.
The third, “6,” represented Cadillac
The fourth and fifth represented the car line/series, C/D=deVille
Digit six represents the body style: 1=two-door coupe/sedan, 5=four-door sedan
Digit seven identities the restraint code: 1=active (manual) belts, 3=active (manual) belts w/driver’s side airbag, and 4=passive (automatic) belts.
The eighth digit identifies the engine: “B”=L26 4.9L V-8
A check digit follows.
The 10th digit represents the model year, “M” for 1991.
The eleventh digit represents the assembly plant.
The remaining six digits identify the production sequence number.


Sedan DeVille 1991

Type 90-degree overhead valve V-8
Block Aluminum block
Cylinders cast iron cylinder liners
Head cast iron cylinder heads
Displacement 300 cu. in. (4.9 liters)
Bore & Stroke 3.62 x 3.62 in.
Compression ratio 9.5:1
Bhp 200 @ 4100 rpm
Torque 275 lb.-ft. @ 3000 rpm
Lifters Roller hydraulic valve lifters
Injection Sequential port fuel injection


Coupe DeVille

Sedan DeVille

Wheelbase 110.8 in (2814 mm) 113.8 in. (2891 mm)
Overall Length 202.6 in. (5146 mm) 205.6 in. (5222 mm)
Height 54.9 in. (1394 mm) 55.2 in. (1402 mm)
Width 73.4 in. (1864 mm) 73.4 in. (1864 mm)
Front Tread 60.3 in. (1632 mm) 60.3 in. (1532 mm)
Rear Tread 59.8 in. (1519 mm) 59.8 in. (1519 mm)
Standard Tires Michelin P205/70R15


Sedan DeVille 1991

Transmission 4T60-E electronically controlled four-speed automatic with overdrive (includes viscous converter clutch)
Steering Power-assisted rack-and-pinion
Front Suspension independent Macpherson strut with coil springs. strut-type shock absorbers, integral-in strut and stabilizer bar
Rear Suspension fully independent with coil springs. automatic level control and strut-type superlift shock absorbers and no rear stabilizer
Brakes Power assisted front disc/rear drum w/Teves anti-lock braking system
Body Construction integral body-frame
Fuel Tank 18.0 gal.


Sedan DeVille 1991

Coupe DeVille Spring Edition Pkg. (incl. cast alum wheels, front & rear carpeted floor mats, illuminated entry, leather seating, illuminated vanity mirrors, six-way power passenger seat, full cabriolet roof, and gold ornamentation) $1,481.
Opt. Pkg. B $320. Opt. Pkg. C $586.
Opt. Pkg. D $1045. Security Pkg. $385.
Cold Weather Pkg $369. Digital Instrument Cluster $250.
Illuminated Entry Syst. $90. Auto Day/Night Mirror $110.
Astroroof $1550 Coachbuilders Pkg. (Sedan deVille) $1,000.
Gold Ornamentation Pkg. $395. H.D. Livery Pkg. (Sedan deVille) $1,000.
Leather Seating $570. Firemist Paint $240.
Lower Accent Firemist Paint $50. Two-tone Paint (Sedan deVille) $225.
Delco-Bose Sound Syst. $575 Delco-Bose Sound Syst. w/CD $872.
Formal Cabriolet Roof (Coupe deVille) $925. Full Cabriolet Roof (Coupe deVille) $1095.
Phaeton Roof (Sedan deVille) $1095. Locking Wire Wheel Discs $235.
Lace Cast Aluminum Wheels $235. FX3 Computer Command Ride $380

1991 Coach Builders Limited Deville convertible–owner: John Burnside


  • Cadillac’s model year production totaled 220,284 compared with 268,698 the year previous.
  • Based on sales at 213, 288 automobiles in 1991 (vs. 258,168 the year before).
  • Cadillac’s share of the U.S. market was 2.61 percent compared with 2.78 percent in 1990.