🏷️ Basic Information Identification Make: Porsche Model: 928 Model Variants: S, S4, GT, GTS Production Years Covered: 1978-1994 Codes Chassis Code: 928 👋 Introduction Market Position Vehicle Type: Luxury Grand Tourer (GT) Target Market: High-end performance and luxury market Competitive Analysis Key Competitors: Ferrari 400, Aston Martin V8 Vantage, Jaguar XJ-S. Key Features Unique Selling Points: Front-engine, rear-wheel drive transaxle layout, V8 engine, advanced (for its time) technology, Porsche build quality. Manual Value Proposition: Inexpensive way to keep a complex and high-performance vehicle working properly, enabling DIY maintenance and repairs. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual Language: English Format: PDF Completeness: 100% Complete and Intact Target Audience: DIY Enthusiast & Experienced Mechanic 📖 Manual Coverage Systems Covered Engine: Detailed diagnostics, overhaul, timing belt replacement, fuel injection systems (CIS/EFI), cooling system, lubrication. Transmission: Manual and Automatic (Type 928/930 for manual, 089/093 for automatic) overhaul, fluid changes, clutch service, torque converter. Drivetrain: Rear transaxle, driveshafts, CV joints, differential, propeller shaft. Suspension: Front McPherson struts, rear trailing arms, anti-roll bars, bushings, shock absorbers, alignment specifications. Brakes: Front and rear disc brakes, ABS (for later models), brake fluid specifications, caliper overhaul, parking brake. Steering: Power steering system, steering rack, linkages, wheel alignment. Electrical: Wiring diagrams, battery, alternator, starter motor, ignition system, lighting, gauges, instrument cluster, comfort electronics. Bodywork: Body panel removal and installation, door mechanisms, glass replacement, weatherstripping, interior trim. Climate Control: Air conditioning system diagnosis and repair, heater core replacement, blower motor. Fuel System: Fuel pump, fuel injectors, fuel lines, fuel tank, emissions control systems. Procedures Included Maintenance: Oil and filter changes, coolant service, brake fluid flush, spark plug replacement, air filter replacement. Troubleshooting: Diagnostic flowcharts for common issues, fault code interpretation (where applicable), symptom-based troubleshooting. Repair: Step-by-step instructions for component removal, repair, and reinstallation for all major systems. Overhaul: Complete engine and transmission rebuild procedures. Installation: Procedures for replacing major components and accessories. Technical Depth Depth: Comprehensive, covering from basic maintenance to complete engine and transmission overhauls, with detailed diagnostic procedures. Illustrations: Hundreds of photos and detailed illustrations guiding through procedures. Disassembly: Based on complete disassembly of the vehicle, providing granular detail. 📊 Manual Specifications File Format File Type: PDF Operating System Compatibility: All PC-based Windows operating systems and Mac Printability: All pages are printable Print Quality Image Resolution: High Text Clarity: Sharp and legible Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: V8 Displacement Early: 4.5 Liters (4474 cc) Displacement S Models: 4.7 Liters (4664 cc) Displacement S4 Gt Gts: 5.0 Liters (4957 cc) Performance Horsepower Early: Approx. 220-240 hp (depending on market/spec) Horsepower S4: Approx. 300 hp Horsepower Gts: Approx. 322 hp Torque S4: Approx. 315 lb-ft (427 Nm) Fuel System Fuel Delivery Early: Bosch K-Jetronic (CIS) Continuous Injection System Fuel Delivery Later: Bosch Motronic Electronic Fuel Injection (EFI) Fuel Type: Unleaded Premium Gasoline 🔧 Transmission Standard Transmission Type Early: 5-speed Manual Transaxle (Porsche Type 928) Optional Transmission Type Optional: 3-speed Automatic Transaxle (Porsche Type 089/093) Features Transaxle Design: Rear-mounted transaxle for 50/50 weight distribution. Clutch Type: Single dry plate clutch (manual). 📐 Dimensions Exterior Length: Approx. 4519-4655 mm (depending on model year) Width: Approx. 1787-1800 mm Height: Approx. 1280-1310 mm Weights Curb Weight: Approx. 1450-1650 kg (depending on model and equipment) 🛡️ Safety Features Ratings Crash Safety: Designed with advanced crumple zones and safety cage for its era. No formal modern crash ratings available. Active Features ABS: Optional on later models (e.g., S4 and beyond). Passive Features Airbags: Driver's airbag introduced on later models (e.g., S4). Seatbelts: Three-point inertia-reel seatbelts. Headlights: Pop-up halogen headlights for improved aerodynamics. 💡 Technology Features Infotainment Original Audio System: Factory-installed premium sound systems with cassette players. Later models may have CD options. Instrumentation: Comprehensive analog gauges, including tachometer, speedometer, oil pressure, oil temperature, coolant temperature, and fuel level. Warning lights for critical systems. Driver Assistance Cruise Control: Standard on most models. ABS: Available on later models, enhancing braking safety. Connectivity Original Connectivity: N/A (No built-in modern connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles or annually. Timing Belt Replacement: Every 30,000-60,000 miles or 3-5 years (crucial due to interference engine). Fluid Specifications Engine Oil: API SG or higher, viscosity typically 10W-40 or 15W-50 (consult specific model year for exact spec). Coolant: Glysantin G05 or equivalent (long-life silicate-free coolant). Brake Fluid: DOT 4. Transmission Fluid Manual: Porsche Gear Oil 000 043 205 09 (or equivalent GL-5 specification). Transmission Fluid Auto: Dexron III or equivalent. Known Issues Common Wear Items: Timing belts, fuel accumulators, fuel pumps, control pressure regulators, cooling fans, power window regulators, front suspension bushings, rear main seal leaks. Electrical Gremlins: Can be prone to electrical issues due to age and complexity of systems. Wiring harness degradation can occur. 📚 Vehicle History...