1999 GMC Sonoma Service and Repair Manual

This factory service and repair manual for the 1999 GMC Sonoma covers a compact pickup sold as a three-door extended cab, a two-door extended cab or a two-door standard cab, in SL, SLE or SLS trim. The engine choice runs to two: a naturally aspirated 2.2L inline-four of 134 cubic inches, and a naturally aspirated 4.3L V6 of 262 cubic inches, both overhead-valve. Each has its own tune-up figures, torque values and diagnostic procedures, and the rest of the truck is documented system by system alongside them.

Engines covered

• 2.2L inline-four (134 cu in) — OHV, naturally aspirated, gasoline
• 4.3L V6 (262 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 3-door extended cab pickup
• 2-door extended cab pickup
• 2-door standard cab pickup

Trims covered

• SL
• SLE
• SLS

Known issues on the 1999 Sonoma. A single recall touches this model year, and it involves a replacement fuel pressure regulator assembled without its sealing ring and retainer, so fuel can escape at the joint and find an ignition source. On the complaint side, 83 reports are logged, led by service brakes, with seats and the power train close behind. The hydraulic brake procedures, the seat and body hardware steps, and the transmission and axle diagnostics in this manual are the sections those reports point toward.