The Eldorado Touring Coupe (ETC) received a mid-model year update (it went into production in January 1999 and was available to customers as a 1999-1/2 model by March).
| Feature | Eldorado | ETC |
| Type | 90-degree dual overhead cam Northstar V-8 | |
| Block | Aluminum block with cast iron cylinder liners | |
| Heads | aluminum | |
| Displacement | 279 cu. in. (4.6 liters) | |
| Bore & Stroke | 3.66 x 3.31 in. | |
| Compression ratio | 10.3:1 | |
| Brake horsepower | 275 @ 5600 rpm | 300 @ 6000 rpm |
| Torque | 300 lb.-ft. @ 4000 rpm | 295 lb.-ft. @ 4400 rpm |
| Tappets | Direct acting hydraulic tappets. | |
| Fuel supply | Tuned port fuel injection. | |
| Feature | Dimension |
| Wheelbase | 108.0 in. |
| Overall Length | 200.6 in. |
| Height | 53.6 in. |
| Width | 75.5 in. |
| Front Tread | 60.9 in. |
| Rear Tread | 60.9 in. |
| Eldorado Tires | Michelin P225/60SR16 |
| ETC Tires | Goodyear Eagle RS-A P225/60HR16. |
| Feature | Eldorado | ETC |
| Transmission | 4T80-E electronically controlled four-speed automatic (includes viscous converter clutch) | |
| Steering | Power-assisted rack-and-pinion, Magnasteer. | |
| Front Suspension | Independent MacPherson strut with coil springs. strut-type shock absorbers and stabilizer bar and MacPherson strut dampers | Independent MacPherson strut with coil springs. stabilizer bar and electronic continuously variable road sensing suspension. |
| Rear Suspension | Fully independent short/long arm. rear shock w/airlift and stabilizer bar w/automatic level control | Fully independent, coil springs. short/long arm and stabilizer bar w/automatic level control and electronic continuously variable road sensing suspension |
| Brakes | Power assisted front and rear disc w/Bosch anti-lock braking system | |
| Body Construction | Integral body-frame. | |
| Fuel Tank | 20.0 gals. | |
1999 Eldorado
1999 Eldorado
1999 Eldorado
1999 Eldorado ETC
1999 Eldorado ETC