🏷️ Basic Information Identification Make: Chevrolet Model: Corvette Year: 1991 Codes Platform Code: C4 👋 Introduction Market Position Positioning: Flagship American sports car, offering performance and style Competitive Analysis Competitors 1991: Porsche 911, Ferrari 348, Nissan 300ZX Twin Turbo, Toyota Supra Turbo Key Features Performance Focus: Emphasis on V8 power, handling, and open-top driving experience Design Heritage: Continuation of the C4 generation's modern, aerodynamic styling 📋 Manual Details Coverage Areas Primary Coverage: 1991 Chevrolet Corvette Secondary Coverage: All U.S. and Canadian specifications Page Count Estimated Pages: Approximately 1500+ Manual Type Type: Complete Workshop Service Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: L98 5.7L V8, LT1 5.7L V8 (if applicable to early production or specific models) Transmission: 4-speed Automatic (700R4/4L60), 4-speed Manual (Z51 option) Drivetrain: Rear-wheel drive, differential, axles, driveshaft Suspension: Front and rear independent suspension, shock absorbers, springs, control arms, sway bars Brakes: Front and rear disc brakes, ABS system, hydraulic lines, calipers, rotors Steering: Power steering system, steering column, rack and pinion Electrical: Battery, alternator, starter, ignition system, lighting, dashboard instruments, power windows, power locks, HVAC controls, body control module (BCM) Fuel System: Fuel pump, injectors, fuel lines, fuel tank, emissions control system (ECM) Cooling System: Radiator, water pump, thermostat, coolant hoses, fan Exhaust System: Exhaust manifolds, catalytic converter, mufflers, pipes Body: Exterior panels, interior trim, doors, windows, convertible top (if applicable), bumpers HVAC: Air conditioning, heating, climate control system Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and changes, tire rotations, brake inspections Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs), electrical schematics, component testing Repair: Engine overhaul, transmission repair, brake system overhaul, suspension component replacement, electrical component repair, body panel repair Rebuilds: Engine rebuild specifications, transmission rebuild procedures Troubleshooting: Step-by-step diagnostic procedures for common and uncommon faults Installation: Component replacement and installation guidelines Technical Depth Depth: Comprehensive (from basic maintenance to complete engine/transmission rebuilds) 📊 Manual Specifications File Format File Type: PDF Searchable: Yes Printable: Yes Print Quality Image Resolution: High resolution for clear diagrams and schematics Binding Type Binding: N/A (Downloadable PDF) Paper Type Paper Type: N/A (Downloadable PDF) ⚙️ Engine Specifications Primary Engine Engine Code: L98 Engine Type: 5.7L (350 ci) Tuned Port Injection (TPI) V8 Bore X Stroke: 4.00 in x 3.48 in (101.6 mm x 88.4 mm) Compression Ratio: 9.0:1 Horsepower Hp: 230 hp @ 4000 rpm Torque Lb-Ft: 330 lb-ft @ 3200 rpm Fuel System Fuel Delivery: Tuned Port Injection (TPI) Recommended Fuel: 87 Octane (Minimum) Ignition System Ignition Type: Distributorless Ignition System (DIS) (introduced later, check specific application for '91 L98) Engine Management ECU: ECM (Engine Control Module) 🔧 Transmission Standard Type: 4-speed Automatic (THM 700R4 / 4L60) Optional Type: 4-speed Manual (M-6, with Z51 performance handling package) Features Automatic Overdrive: Yes (4th gear) Fluid Type Automatic Fluid: Dexron III / Mercon Automatic Transmission Fluid Fluid Capacity Automatic Capacity: Approx. 7.5 pints (3.5 liters) without torque converter drain 📐 Dimensions Exterior Length: 178.3 inches (4529 mm) Width: 70.4 inches (1788 mm) Height: 46.4 inches (1179 mm) (Coupe), 46.2 inches (1173 mm) (Convertible) Wheelbase: 96.2 inches (2443 mm) Weights Curb Weight Coupe: 3288 lbs (1491 kg) Curb Weight Convertible: 3410 lbs (1547 kg) Gross Vehicle Weight Rating: Approx. 4200 lbs (1905 kg) 🛡️ Safety Features Ratings NHTSA Driver Front Impact: 4 Stars (1991 Model Year) NHTSA Passenger Front Impact: 4 Stars (1991 Model Year) Active Features ABS: Standard (Anti-lock Braking System) Passive Features Airbags: Driver's side airbag Seat Belts: Three-point inertia reel seat belts Roll Bar: Integrated roll bar structure (Coupe) 💡 Technology Features Infotainment Audio System: AM/FM stereo with cassette player, optional CD player, Bose sound system (optional) Climate Control: Manual or optional automatic climate control Driver Assistance Cruise Control: Standard Connectivity Original Connectivity: Limited to basic vehicle systems, no modern connectivity features 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles or 6 months, whichever comes first (under normal driving conditions) Transmission Fluid Change: Every 30,000 miles or 24 months Coolant Change: Every 30,000 miles or 24 months Spark Plug Replacement: 100,000 miles Fluid Specifications Engine Oil Type: API SG, SAE 5W-30 (check owner's manual for temperature variations) Engine Oil Capacity: 5.0 U.S. quarts (4.7 liters) with filter change Coolant Type: GM Delco-GM Blue Coolant (50/50 mix with distilled water) Brake Fluid Type: DOT 3 Known Issues Common Problem 1: Aging rubber seals and gaskets (e.g., coolant hoses, window seals) leading to leaks Common Problem 2: TPS (Throttle Position Sensor) failures affecting engine performance Common Problem 3: C4-specific dashboard electronic issues (e.g., digital displays) Common Problem 4: TPI system maintenance and potential clogging Common Problem 5: Wear on suspension bushings and ball joints 📚 Vehicle History Brand Heritage Brand Identity: Chevrolet, a division of General Motors, known for American muscle and performance vehicles Model Evolution C4 Generation Introduction: 1984 C4 Key...