🏷️ Basic Information Identification Make: Chevrolet Model: Corvette C4 Year: 1991 Model Code: C4 Market Segment: Sports Car / Grand Tourer 👋 Introduction Market Position Positioning: The Chevrolet Corvette C4 represented America's premier sports car in 1991, competing with European exotics and high-performance coupes. This manual serves enthusiasts and professional technicians looking to maintain or restore this iconic vehicle. Competitive Analysis Competitors: Porsche 944, BMW 8 Series, Nissan 300ZX (Z32), Toyota Supra (Mk3). Key Features Value Proposition: Empowers owners to perform their own maintenance and repairs, saving significant costs and fostering a deeper understanding of their vehicle. Ease Of Use: Features step-by-step instructions and illustrations for simplified repair processes. 📋 Manual Details Coverage Areas Primary Coverage: Complete Service, Repair, and Workshop Procedures Models Covered: All 1991 Chevrolet Corvette C4 models, trims, and engine/transmission configurations. Page Count Estimated Pages: Approximately 1,500-2,500 pages (typical for full factory service manuals). Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: Downloadable Digital Format (PDF) 📖 Manual Coverage Systems Covered Engine: Engine mechanical, lubrication, cooling, fuel delivery, ignition, emissions control, starting, charging. Transmission: Manual and automatic transmission service, repair, and overhaul. Drivetrain: Driveshaft, differential, axles, and suspension components. Brakes: Hydraulic system, anti-lock braking system (ABS), parking brake, component replacement. Steering: Power steering system, steering linkage, wheel alignment. Electrical: Battery, charging system, starting system, lighting, instrument cluster, power accessories, body control modules, wiring diagrams. HVAC: Heating, ventilation, and air conditioning system diagnosis and repair. Body: Body panels, doors, glass, interior trim, exterior trim, bumpers, seals. Chassis: Frame, subframes, mountings, and related components. Exhaust System: Diagnosis and repair of exhaust components. Fuel System: Fuel pump, injectors, lines, tank, and pressure regulation. Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, lubrication. Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs), component testing procedures. Repair: Step-by-step instructions for component removal, disassembly, repair, reassembly, and installation. Overhaul: Detailed procedures for engine, transmission, and differential rebuilds. Adjustment: Adjustment procedures for engine timing, idle speed, clutch, brakes, etc. Specifications: Torque specifications, clearances, fluid capacities, electrical parameters. Wheel Alignment: Specifications and procedures for front and rear wheel alignment. Air Conditioning Recharge: Procedures for refrigerant and oil servicing (referencing R134a transition or R12 depending on specific vehicle build date and region). Technical Depth Depth: Comprehensive: Covers everything from routine maintenance and basic repairs to advanced diagnostics and complete component overhauls. Wiring Diagrams: Includes detailed electrical wiring diagrams for all systems. Troubleshooting Charts: Includes comprehensive troubleshooting charts and flow diagrams. 📊 Manual Specifications File Format File Type: PDF Searchable: Yes (typically) Print Quality Quality: High Quality (Digital) Binding Type Binding: N/A (Downloadable) Paper Type Paper: N/A (Digital) Accessibility Device Compatibility: PC, Mac, Tablets, Smartphones Software Requirement: Adobe Reader (Free) ⚙️ Engine Specifications Primary Engine Engine Name: L98 (350 ci) Engine Type: V8, Pushrod OHV Displacement: 5.7 Liters (350 Cubic Inches) Bore X Stroke: 4.00 in x 3.48 in (101.6 mm x 88.4 mm) Performance Horsepower: 230-245 hp @ 4,000-4,400 rpm (depending on specific configuration) Torque: 315-345 lb-ft @ 3,200-3,500 rpm (depending on specific configuration) Fuel System Fuel Delivery: Bosch Tuned Port Injection (TPI) with Sequential Fuel Injection (SFI) for some late models/california. Fuel Type: Unleaded Premium Gasoline (91+ Octane Recommended) Cooling System Coolant Capacity: Approx. 13.7 Quarts (13.0 Liters) Lubrication System Oil Capacity With Filter: 5 Quarts (4.7 Liters) Engine Management ECU: Engine Control Unit (ECU) with diagnostic capabilities. 🔧 Transmission Standard Type: 4-Speed Automatic (700R4 / 4L60) Optional Type: 6-Speed Manual (ZF S6-40) Features Automatic Features: Electronic control, overdrive. Manual Features Manual Features: Close-ratio, robust design for performance driving. Fluid Specifications Automatic Fluid Type: Dexron III ATF (or equivalent) Manual Fluid Type: GM Synchromesh Transmission Fluid (or equivalent) Fluid Capacities Automatic Capacity: Approx. 4.5 Quarts (4.3 Liters) for dry fill. 📐 Dimensions Exterior Length: 178.3 inches (4,529 mm) Width: 70.4 inches (1,788 mm) Height: 46.4 inches (1,179 mm) Wheelbase: 96.2 inches (2,443 mm) Weights Curb Weight: Approx. 3,200-3,400 lbs (1,451-1,542 kg) 🛡️ Safety Features Ratings NHTSA Rating: N/A (Ratings standards varied significantly in this era) Active Features ABS: Standard Anti-lock Braking System (ABS) Passive Features Airbags: Driver-side airbag (introduced in 1990, standard for 1991) Seatbelts: 3-point inertia reel seat belts Rollover Protection: Integral roll bar structure behind seats 💡 Technology Features Infotainment Audio System: Delco-Bose premium sound system often available, AM/FM stereo cassette player with optional CD player. Climate Control: Manual or optional electronic automatic climate control (EATC). Driver Assistance Cruise Control: Standard Connectivity Connectivity Features: None (modern connectivity features not present) 🔧 Maintenance Service Intervals Oil Change: Every 3,000-7,500 miles (5,000-12,000 km) or 6-12 months, depending on driving conditions and oil type. Transmission Fluid Change: Every 30,000-50,000 miles (48,000-80,000 km) for automatic, every 50,000-100,000 miles (80,000-160,000 km) for manual. Spark Plug Replacement: Every 30,000-60,000 miles (48,000-96,000 km), depending on plug type. Coolant Flush: Every 30,000-50,000 miles (48,000-80,000 km) or 2-3 years....