1991 GMC G2500 Service and Repair Manual

This factory service and repair manual for the 1991 GMC G2500 has to answer for four engines and three bodies at once. The engines are the naturally aspirated 4.3L V6, 5.0L V8, 5.7L V8 and 6.2L diesel V8, every one overhead-valve; the bodies are the 3-door standard cargo van and the extended cargo and passenger vans. Trim badges read Rally, Rally STX or Vandura. Because coverage is arranged by system, the procedures, specifications, torque values, wiring diagrams and diagnostics for any one of those combinations sit together instead of scattered across the book.

Engines covered

• 5.0L V8 (305 cu in) — OHV, naturally aspirated, gasoline
• 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
• 4.3L V6 (262 cu in) — OHV, naturally aspirated, gasoline
• 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 3-door standard cargo van
• 3-door extended passenger van
• 3-door extended cargo van

Trims covered

• Rally
• Rally STX
• Vandura

Known issues on the 1991 G2500. The emphasis is on service data: fuel, ignition and cooling specifications for the three gasoline engines, service procedures for the 6.2L diesel V8, brake and steering torque values, wiring diagrams for the van's lighting and accessory circuits, and diagnostics for each of those systems, which is what a van still in daily use tends to need.