🏷️ Basic Information Identification Make: Porsche Model: 928 S Model Year: 1987 Chassis Code: 928 Engine Code Range: M28/48 👋 Introduction Market Position Target Audience: Porsche 928 owners, independent workshops, and automotive technicians specializing in Porsches. Competitive Analysis Value Proposition: Empowers owners and technicians to perform complex electrical diagnostics and repairs, reducing reliance on expensive dealership services. Key Features Uniqueness: Directly from factory/OEM sources, ensuring accuracy and completeness for the specific model year and variant. Usability: Designed for practical application, with illustrations and diagrams that are understandable even for those with basic electronic knowledge. 📋 Manual Details Coverage Areas Primary Focus: Electrical Systems Troubleshooting and Repair Secondary Coverage: Component Functionality and Wiring Diagrams Page Count Estimated Page Count: Detailed, often exceeding 200 pages for comprehensive wiring. Manual Type Type: Wiring Diagram Manual / Electrical Troubleshooting Manual Language Language: English Format Format: Printed Document 📖 Manual Coverage Systems Covered Engine Management Electronics: Fuel injection (K-Jetronic), ignition system, ECU functions. Lighting System: Headlights (including pop-up mechanism), taillights, interior lighting, fog lamps. Instrumentation And Gauges: Speedometer, tachometer, fuel gauge, oil pressure, temperature, warning lights. Climate Control System: HVAC blower, actuators, temperature control unit, A/C compressor clutch. Power Accessories: Power windows, power seats, power mirrors, central locking, sunroof (if equipped). Audio System: Factory radio, amplifier (if equipped), speaker wiring. ABS System: Anti-lock Braking System wiring and component connections. Wiper And Washer System: Wiper motor, washer pump, controls. Horn System: Horn operation, relay, switch. Trailer Tow Connections: Wiring for trailer lights and accessories. Procedures Included Troubleshooting Guides: Systematic approaches to diagnose electrical faults. Wiring Diagram Interpretation: Detailed explanations of schematic symbols and connections. Component Testing: Guidance on testing individual electrical components for functionality. Fuse And Relay Identification: Location and function of all fuses and relays. Ground Point Locations: Identification of all chassis and system ground points. Connector Pinouts: Detailed diagrams of connector configurations and pin assignments. Technical Depth Diagnostic Level: Advanced diagnostic procedures for complex electrical issues. Repair Procedures: Detailed steps for repairing or replacing electrical components and wiring harnesses. Circuit Analysis: Understanding of how individual circuits function and interact. Component Specifications: Electrical resistance, voltage, and current specifications for key components. 📊 Manual Specifications File Format Digital File Format: N/A (Printed) Print Quality Diagram Clarity: High-quality prints with clear, legible diagrams and text. Binding Type Binding: Professionally bound for durability and ease of use in a workshop environment. Paper Type Paper Quality: Durable paper stock suitable for workshop conditions. ⚙️ Engine Specifications Primary Engine Engine Type: V8, Naturally Aspirated Displacement: 4.7 Liters (4664 cc) Bore X Stroke: 94.0 mm x 84.0 mm Compression Ratio: 10.0:1 Performance Horsepower: Approx. 310 PS (228 kW) DIN (European spec, US spec slightly lower) Torque: Approx. 430 Nm (317 lb-ft) DIN (European spec) Fuel System Fuel Injection: Bosch K-Jetronic (CIS-E with Lambda control) Fuel Type: Unleaded Premium Gasoline (95 RON or higher) Ignition System Ignition Type: Electronic Ignition with Distributor 🔧 Transmission Standard Transmission Type: 5-Speed Manual Transaxle Optional Transmission Type: 4-Speed Automatic Transaxle (Tiptronic not yet available) Features Transaxle Design: Rear-mounted transaxle for optimal weight distribution. Fluid Specifications Manual Transmission Fluid: GL-4 SAE 75W-90 Synthetic Gear Oil Automatic Transmission Fluid: Dexron III Automatic Transmission Fluid 📐 Dimensions Exterior Length: 4,655 mm (183.3 in) Width: 1,780 mm (70.1 in) Height: 1,280 mm (50.4 in) Wheelbase: 2,433 mm (95.8 in) Weights Curb Weight Manual: Approx. 1,580 kg (3,483 lbs) Curb Weight Automatic: Approx. 1,620 kg (3,571 lbs) Cargo Cargo Volume: Rear hatch with limited luggage space; additional space behind rear seats. 🛡️ Safety Features Ratings Crash Test Data: Limited public data for this era, but designed with Porsche's inherent safety focus. Active Features ABS: Standard Anti-lock Braking System (ABS) Brakes Front: Ventilated Discs, 304 mm diameter Brakes Rear: Discs, 300 mm diameter Passive Features Airbags: Driver's side airbag (standard in 1987) Seatbelts: 3-point inertia reel seatbelts with pretensioners Chassis Construction: Reinforced safety cell, crumple zones 💡 Technology Features Infotainment Audio System: Factory installed premium sound system, often with amplifier and multiple speakers. Climate Control: Automatic climate control with temperature and fan speed regulation. Driver Assistance Cruise Control: Standard electronic cruise control. Connectivity Data Communication: No modern OBD-II or CAN bus communication; troubleshooting relies on analog circuits and specific diagnostic tools of the era. 🔧 Maintenance Service Intervals Oil Change Interval: Every 10,000 km (6,000 miles) or annually. Timing Belt Replacement: Every 60,000 km (37,000 miles) or 4 years. Brake Fluid Flush: Every 2 years. Fluid Specifications Engine Oil Specification: API SG/SH, ACEA A2-96, SAE 5W-40 or 10W-40 Synthetic Coolant Type: Glysantin G48 (or equivalent) with distilled water (50/50 mix) Power Steering Fluid: Pentosin CHF 11S or CHF 202 Known Issues Electrical Gremlins: Age-related degradation of wiring insulation, connector corrosion, and relay failure is common. This manual is essential for addressing these. Fuel System Maintenance: K-Jetronic system requires precise adjustments and clean...