1990-1993 GMC S15/Sonoma Pickup: Technical Specifications

Three engines were available in the early '90s: a 94-horsepower, 2.5-liter 4-cylinder; 125-horsepower, 2.8-liter V6; or 4.3-liter V6, rated at 160 horsepower. By 1992, the 4-cylinder was developing 105 horsepower, and a high-output 4.3-liter V6 (standard on the GT) made 195 horsepower. Syclones got a turbocharged 4.3-liter V6, making 280 horsepower. Two-wheel-drive Sonomas had the 4-cylinder engine as standard and the 2.8-liter V6 as an option (except on the Special). The 4.3-liter V6 was standard on 4WD Sonomas, optional with 2WD. By 1993, GMC's "enhanced" 195-horsepower version of the 4.3-liter might be installed on all models except the Special and 2WD long-bed. (Chevrolet compact pickups could not have the "enhanced" engine.) A 5-speed manual transmission was standard with the 4-cylinder, 2.8-liter V6, and regular 4.3-liter V6. Four-speed overdrive automatic was optional (mandatory with the enhanced 4.3-liter), but not available with the 2.8-liter V6. Insta-Trac part-time 4WD had automatic-locking front hubs and shift-on-the-fly between 2WD and 4WD High. An electronic-shift transfer case was optional on all 4x4s with the 4.3 engine and automatic, except the Special.