🏷️ Basic Information Identification Make: GMC Model: Sonoma Year: 1998 Codes Platform Code: GMT325 (Second Generation) 👋 Introduction Market Position Target Audience: GMC Sonoma owners, independent repair shops, DIY enthusiasts Competitive Analysis Value Proposition: Vehicle-specific, technician-level information at a fraction of dealership costs; eliminates reliance on generic guides Key Features Digital Format Benefits: Searchable, easily navigable, printable on demand, no greasy pages, secure storage on PC Illustration Quality: Detailed diagrams and illustrations for clear understanding of procedures 📋 Manual Details Coverage Areas All Models Trims: Yes Repair Scope: A-Z (All Repairs) Page Count Estimated Page Count: N/A (PDF format) Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, internal components, timing, seals, gaskets Engine Control System: ECU diagnostics, sensor operation, fuel injection, ignition timing Fuel System: Fuel pump, injectors, fuel filter, pressure regulator, lines Emission Control: Catalytic converter, O2 sensors, EGR system, evaporative emission control Cooling System: Radiator, water pump, thermostat, hoses, fan operation Lubrication System: Oil pump, oil filter, oil cooler (if equipped), oil passages Ignition Starting Charging: Spark plugs, ignition coils, starter motor, alternator, battery testing Automatic Transmission: Internal components, valve body, torque converter, fluid service, solenoids Manual Transmission: Clutch system, gear sets, synchronizers, shift linkages, fluid service Transfer Case Propeller Shaft: 4WD/AWD system operation, U-joints, driveshaft alignment, fluid service Differential Axle: Front and rear differential service, axle bearings, seals, lubricant specifications Suspension: Front and rear suspension components, struts, shocks, ball joints, bushings, alignment specifications Tire Wheel: Tire pressure monitoring, wheel bearing service, lug nut torque specifications Brake Control System: ABS operation, master cylinder, brake booster, proportioning valve Brakes: Front and rear brake pad/shoe replacement, rotor/drum service, caliper/wheel cylinder overhaul, bleeding procedure Parking Brake: Cables, adjustment, service Steering Column: Tilt mechanisms, ignition switch, steering wheel removal/installation Power Steering: Pump, reservoir, hoses, steering gear/rack, fluid specifications Air Conditioning: System components, refrigerant charge, diagnostics, component replacement Supplemental Restraint System: Airbag system diagnostics, SRS module, occupant sensors Seat Belt System: Retractors, buckles, pre-tensioners, service Engine Immobilizer: System operation, key programming (if applicable) Cruise Control: System diagnostics, actuators, switches Wiper Washer: Wiper motor, linkages, washer pump, nozzles Door Lock: Power door locks, manual locks, actuators, linkages Meter Audio Visual: Instrument cluster, gauges, audio system diagnostics, speaker wiring Horn: Horn operation, horn button, wiring Windshield Glass Mirror: Windshield replacement, glass seals, mirror adjustments/replacement Instrument Panel: Removal, installation, lighting, switch servicing Seat Mechanisms: Seat adjustment, power seat components, seat belt anchors Engine Hood Door Body: Hood latch, hinges, door hinges, body panel alignment Exterior Interior Trim: Bumpers, grilles, door panels, headliner, carpet removal/installation Electrical System: Fuse box, relays, lighting circuits, accessory circuits Multiplex Can Communication: Body control module (BCM) diagnostics, data communication networks (if applicable) Procedures Included Maintenance Tasks: Oil changes, filter replacements, fluid checks, tune-ups Diagnostic Procedures: Troubleshooting guides for all systems, symptom-based diagnostics Repair Procedures: Step-by-step instructions for component removal, overhaul, and installation Wiring Schematics: Complete electrical diagrams for all circuits Technical Specifications: Torque values, clearances, fluid capacities, electrical resistance values Technical Depth Depth: Factory-level detail, suitable for professional technicians and advanced DIYers 📊 Manual Specifications File Format Compatibility: Windows Vista (32/64), XP, ME, 98, NT, 2000; Mac compatible Required Software: Adobe PDF Reader, Winzip (free) Print Quality Printability: All pages printable, zoomable images for enlarged copies Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Base Engine: 2.2L I4 (LL2) Optional Engine 1: 4.3L V6 (L35) Optional Engine 2: 5.0L V8 (LT1 - Rare, for specific configurations) Performance 2.2L I4 Horsepower: Approx. 125 hp @ 5200 rpm 4.3L V6 Horsepower: Approx. 165-190 hp @ 4500-5000 rpm (depending on tune) Fuel System Fuel Delivery: Multi-port Fuel Injection (MPI) 🔧 Transmission Standard Transmission Standard Transmission Type: 5-speed Manual (NV1500) Optional Transmission Optional Transmission Type: 4-speed Automatic (4L60-E) Features 4Wd System: Optional (with various transfer case options) 📐 Dimensions Exterior Body Styles: Regular Cab, Extended Cab Bed Lengths: Short Bed, Long Bed 🛡️ Safety Features Ratings NHTSA Rollover Resistance: Good (for its class and era) Active Features ABS: Standard on most models Passive Features Airbags: Driver and Passenger airbags standard 💡 Technology Features Infotainment Audio System: Factory AM/FM/Cassette, optional CD player. Basic speaker configurations. Driver Assistance ABS: Anti-lock Braking System available. Connectivity Connectivity Features: Limited by era; primarily basic power outlets. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 miles or 3-6 months (consult manual for specific engine) Transmission Fluid Change: Every 30,000-60,000 miles (depending on usage and fluid type) Coolant Flush: Every 30,000-60,000 miles or 2-4 years Fluid Specifications Engine Oil Specification 2.2L: API SG or SH, SAE 5W-30 Engine Oil Specification 4.3L: API SG or SH, SAE 10W-30 or 5W-30 (depending on temperature) Automatic Transmission Fluid: Dexron III Power Steering Fluid: Dexron II/III Known Issues Intake Manifold Gasket...