for the 1991 model year. It came with all-wheel drive, 4-wheel anti-lock brakes, a 4.3-litre LB4 V6 with lower compression pistons, a turbocharger and water intercooler system, They produced ~280 hp. Production was limited to just 2998 units. Engines Second generation (1994) The second-generation trucks arrived for the 1994 model year. All of the special models (the Syclone, Typhoon, and Sonoma GT) were discontinued, but the changes to the pickup brought it in line with its major competitor the Ford Ranger. The Iron Duke 4-cylinder and 2.8 L 60° V6 engines were retired, the 4.3 L Vortec V6 was enhanced, and a new 2.2 L 4-cylinder engine (which had been introduced in 1990 on various front-wheel drive GM compact and mid-size platforms) became the engines of choice to power the second generation of S-10s. In compliance with the Clean Air Act, all second generation S-10s and Sonomas equipped with air conditioning used CFC-free R134a refrigerant beginning in the 1994 model year. The all new 1994 S-10 didn't offer any airbag, presumably as a temporary measure to economize the introduction of the new body styles, as well as to gradually phase out steering wheel designs that didn't accommodate for airbags, though the vehicle itself was slated for airbag capability. Many of the chassis components were the same as the first generation (the control arms between the first and second generation were the same, originally sourced from GM's G-body platform), along with the steering knuckle, leaf springs, and differential assembly but suspension and axles were greatly enhanced. Lower control arms for the two-wheel drive model had 1/4-inch thicker steering stops - the second generation control arms are commonly used as an upgrade for the first generation. Sport utility models (Blazer, Jimmy, Bravada) came with thicker front and rear sway bars. Generally, for the two-wheel drive trucks, the 8.5-inch rear end was only used when it came with both a manual transmission and the L35 W-code V6 engine; it was an option for four-wheel drive trucks with either transmission. This was also the year that GM introduced the ZR2 off-road package. For 1995, a driver's side airbag was added as well as daytime running lights. In 1996 the 4.3 L engine was refreshed, and a third (rear) door was added for extended cab models, along with the sportside bed option. In 1998, the exterior, interior, brakes, and 2.2 L I4 engine were refreshed,