🏷️ Basic Information Identification Make: GMC Model: Sonoma Model Years Covered: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Codes Platform: GMT355 👋 Introduction Market Position Positioning: A compact pickup truck known for its utility, versatility, and often affordable entry price. Competed with Ford Ranger, Toyota Tacoma, and Dodge Dakota. Competitive Analysis Comparable Models: Ford Ranger, Toyota Tacoma, Dodge Dakota, Nissan Hardbody/Frontier, Mazda B-Series Key Features Vehicle Strengths: Rugged construction, available V6 engines, practical bed configurations, reliable platform shared with Chevrolet S-10. Manual Value Proposition Value: Provides professional-level repair and maintenance information, enabling significant cost savings on service and repairs, increasing vehicle longevity. Model Lineup Variations Cab Styles: Regular Cab, Extended Cab (with rear-opening doors). Trim Levels: Various trim levels existed, such as SL, SLE, Sportside (bed style), and later some special editions. 📋 Manual Details Coverage Areas General Coverage: All repairs, servicing, and troubleshooting procedures Page Count Estimated Pages: Hundreds (exact count not specified, but described as very detailed) Manual Type Type: Service & Repair Workshop Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine overhaul, cylinder head, block, pistons, crankshaft, camshaft, valve train, lubrication system, cooling system Engine Performance: Fuel injection, ignition system, emission controls, diagnostics Transmission Manual: Clutch system, manual transmission overhaul, gears, bearings, synchronizers Transmission Automatic: Automatic transmission overhaul, torque converter, valve body, planetary gears, hydraulic controls Drivetrain: Driveshaft, universal joints, rear axle, front axle (4WD), CV joints, differential Suspension: Front suspension (independent), rear suspension (leaf springs), shocks, struts, ball joints, control arms, bushings Steering: Steering gear, power steering system, steering column, tie rods, linkages Brakes: Front disc brakes, rear drum brakes, ABS system, brake fluid, lines, calipers, wheel cylinders, master cylinder Electrical System: Battery, charging system (alternator), starting system (starter), ignition system, lighting, wiring diagrams, fuses, relays Body And Frame: Body panel repair, doors, hood, tailgate, interior trim, glass, chassis, frame straightening HVAC: Air conditioning system, heater core, blower motor, climate control Restraints: Seat belts, airbag system (SRS) diagnostics and replacement Emissions Control: Catalytic converter, EGR system, O2 sensors, EVAP system, and related diagnostics and repair procedures. Instrument Panel: Gauges, warning lights, interior lighting, climate controls, wiper system. Fuel System: Fuel tank, fuel pump, fuel filter, fuel lines, injectors, pressure regulator. Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and changes, lubrication, spark plug replacement, belt inspection and replacement Troubleshooting: Diagnostic flowcharts, symptom-based troubleshooting, electrical system diagnostics, engine performance issues Repair: Step-by-step instructions for component removal, overhaul, and installation Diagnostics: On-board diagnostics (OBD-I/OBD-II), sensor testing, actuator testing, diagnostic trouble codes (DTCs) Wiring Diagrams: Detailed electrical wiring schematics for all major systems Alignment: Wheel alignment specifications and procedures. Tire And Wheel: Tire pressure specifications, wheel torque, tire rotation. Technical Depth Depth: Complete factory level detail, suitable for professional mechanics and advanced DIY enthusiasts 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Printable (single pages or entire manual) Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Licensing Usage Rights: Unlimited use on multiple devices, lifetime access, no expiry Compatibility Operating Systems: Windows and MAC compatible Searchability Text Searchability: Yes (typically PDF format allows for text searching of terms). Accuracy Information Source: Factory service manual data, mirroring what professional technicians use. ⚙️ Engine Specifications Primary Engine 2.2L I4: Engine Code: LN2 (VIN 4). Power: Approx. 112 hp @ 4800 rpm. Torque: Approx. 130 lb-ft @ 2800 rpm. Fuel System: TBI (Throttle Body Injection) early models, MPFI (Multi-Port Fuel Injection) later models. 2.5L I4: Engine Code: LP5 (VIN 1) - Introduced later. Power: Approx. 122 hp @ 4800 rpm. Torque: Approx. 142 lb-ft @ 2400 rpm. Fuel System: MPFI. 4.3L V6: Engine Code: L35 (VIN W), LV3 (VIN X). Power: Approx. 160-190 hp @ 4400-4800 rpm. Torque: Approx. 230-260 lb-ft @ 2400-2800 rpm. Fuel System: MPFI. Commonly referred to as the Vortec 4300. Performance Engine Options Summary: Inline 4-cylinder (2.2L, 2.5L) and V6 (4.3L) options, offering a balance of fuel economy and power. Fuel System Fuel Type: Unleaded Gasoline Lubrication Oil Capacity: Varies by engine, typically 4.5-5 quarts (e.g., 4.5 quarts for 4.3L V6 with filter). Cooling Coolant Capacity: Varies by engine and configuration, approximately 10-12 quarts. 🔧 Transmission Standard Manual Transmission: 5-speed manual (NV1500, NV3500) available on most models. Optional Automatic Transmission: 4-speed automatic (4L60-E) commonly paired with the 4.3L V6 and available on other engines. Features Drivetrain Options: Rear-Wheel Drive (RWD) standard, Four-Wheel Drive (4WD) optional. 📐 Dimensions Exterior Wheelbase: Varies by cab configuration (Regular Cab, Extended Cab) and bed length. Common wheelbases range from 111.5 inches to 133.5 inches. Overall Length: Varies significantly by cab and bed configuration. Cargo Bed Lengths: Commonly available in 6-foot and 7-foot bed lengths. Weights Curb Weight: Varies widely based on configuration, typically ranging from 3,000 to 4,000+ lbs. 🛡️ Safety Features Ratings...