Base engine for nearly all Sunbirds is a 2.0-liter 4-cylinder. It provides 96 horsepower at 4800 rpm and 118 pound-feet of torque at 3600 rpm in 1990. The addition of fuel injection in 1992 results in a boost to 110 horsepower at 5200 rpm and 124 pound-feet at 3600 rpm. The Sunbird GT features a turbocharged version of the same engine in 1990 (optional as well for the convertible), but switches to a 3.1-liter V6 the following year. The turbocharged version delivers 165 horsepower at 5500 rpm and 175 pound-feet of torque at 4000 rpm. The Sunbird's first V6, later optional on models by '93, provides 140 horsepower at 4200 rpm and 185 pound-feet of torque at 3600 rpm.