🏷️ Basic Information Identification Make: Porsche Model: 928 GT Model Variant: GT Years Covered: 1990, 1991 Generation Generation Designation: Series 2 (Facelift) / Series 3 Codes Chassis Code: 928 👋 Introduction Market Position Positioning: High-performance luxury grand tourer, positioned as a sophisticated alternative to contemporary front-engined sports cars Competitive Analysis Competitors 1990 1991: Ferrari 412, Aston Martin Virage, Jaguar XJS, Mercedes-Benz SL-Class (R129) Key Features Design Philosophy: Front-engine, rear-wheel drive transaxle layout for optimal weight distribution and handling characteristics Gt Specific Enhancements: Higher output engine compared to base 928 models, often featuring revised gearing and suspension tuning for enhanced performance Manual Value Proposition: Enables owners and technicians to perform detailed maintenance, diagnostics, and repairs, saving on dealer costs and ensuring optimal vehicle performance. 📋 Manual Details Coverage Areas Primary Coverage: Workshop Repair and Service Target Audience: Mechanical Technicians Page Count Estimated Page Count: Not Specified (Comprehensive) Manual Type Type: Service Manual / Workshop Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Complete overhaul, tuning, diagnostics, fuel injection, ignition Transmission: Removal, installation, overhaul, diagnostics (likely both manual and automatic, though GT is typically automatic) Drivetrain: Driveshafts, differential, transaxle Suspension: Front and rear suspension, steering system Brakes: Hydraulic system, ABS (if equipped), pad/rotor replacement, caliper overhaul Electrical System: Wiring diagrams, component testing, diagnostics, charging system, lighting Fuel System: Fuel pump, injectors, lines, tank, diagnostics Exhaust System: Component replacement, diagnostics Bodywork: Body panel removal/installation, trim, glass, seals HVAC: Climate control system, components, diagnostics Procedures Included Maintenance: Routine servicing, fluid changes, filter replacements, inspections Repair: Component repair and replacement, troubleshooting guides Overhaul: Detailed procedures for major component rebuilds (engine, transmission) Diagnostics: Troubleshooting charts, symptom-based diagnostics Installation: Removal and installation procedures for all major components Adjustments: Alignment, ignition timing, fuel mixture adjustments Technical Depth Depth: Comprehensive: Covers everything from basic maintenance to full engine/transmission rebuilds Special Tools: References and illustrations of required special tools with Porsche part numbers Proprietary Components: Includes instructions for proprietary components and references manufacturer data Symbols Notation: Utilizes WARNING, CAUTION, and NOTE indicators for safety and procedural emphasis 📊 Manual Specifications File Format Format: PDF Delivery: Electronic (Email) Print Quality Printability: Yes Binding Type Binding: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Code: M28/41 (GT) Engine Type: V8, naturally aspirated Displacement: 5.0 Liters (4957 cc) Bore X Stroke: 97.0 mm x 84.0 mm Compression Ratio: 10.4:1 Performance Horsepower: 326 PS (322 hp; 240 kW) @ 5700 rpm Torque: 490 Nm (361 lb-ft) @ 4500 rpm Fuel System Fuel Delivery: Bosch LH-Jetronic fuel injection Fuel Type: Unleaded gasoline (Premium) Lubrication Oil Capacity: Approx. 10.0 Liters (10.5 US qts) with filter 🔧 Transmission Standard Type: 4-speed Automatic (Tiptronic option available on some later models, not confirmed for this specific manual coverage) Features Layout: Rear transaxle for integrated gearbox, differential, and drive axles Fluid Type Automatic Transmission Fluid: Porsche ATF (or equivalent DEXRON III/MERCON) 📐 Dimensions Exterior Length: 4654 mm (183.2 in) Width: 1788 mm (70.4 in) Height: 1283 mm (50.5 in) Wheelbase: 2550 mm (100.4 in) Weights Curb Weight: Approx. 1560 kg (3439 lbs) 🛡️ Safety Features Ratings Crash Testing: No formal modern crash test ratings available, but built to high safety standards of its era. Active Features ABS: Standard on GT models Passive Features Airbags: Driver's airbag standard Seat Belts: Three-point inertia-reel seat belts 💡 Technology Features Infotainment Audio System: Premium sound systems available, often from Blaupunkt or Becker Driver Assistance Cruise Control: Standard Connectivity Diagnostic Ports: OBD-I style diagnostic connectors for engine management and ABS systems. 🔧 Maintenance Service Intervals Oil Change: Every 10,000 km (6,000 miles) or 12 months, whichever comes first Major Service: Recommended at higher mileage intervals (e.g., 50,000 km / 30,000 miles) including timing belt inspection/replacement. Fluid Specifications Engine Oil: API SG/SH, SAE 0W-40 or 5W-40 recommended (check manual for specific Porsche approvals) Coolant: Porsche approved coolant (e.g., G40 specification) Brake Fluid: DOT 4 Known Issues Common Wear Items: Timing belt and tensioner, water pump, fuel accumulator, suspension bushings, electrical contacts, climate control O-rings. Documentation Focus: Manual details troubleshooting and repair for these common and specific issues. 📚 Vehicle History Brand Heritage Founding Principles: Porsche AG, renowned for its sports car engineering and racing heritage, established in 1931. Model Evolution 928 Development: Conceived as a flagship luxury GT to complement the iconic 911, featuring advanced technology and a front-engine layout. Gt Introduction: The GT variant, introduced in 1989, represented an evolution of the 928 with enhanced performance, refined aesthetics, and improved features. Production Manufacturing Location: Stuttgart, Germany Production Years 928 Series: 1977-1995 🏆 Awards & Recognition Recognitions Design Awards: Winner of the Car and Driver Magazine 'Ten Best' list multiple times during its production run. Ratings Automotive Press: Consistently praised for its handling, performance, and build quality.