🏷️ Basic Information Identification Make: Porsche Model: 928 Year: 1984 Market: USA Model Codes Model Code: 928 S 👋 Introduction Market Position Positioning: Premium Grand Tourer (GT) in the luxury sports car segment. Competitive Analysis Competitors 1984: Ferrari 400i, Aston Martin V8 Vantage, Jaguar XJS, BMW 6 Series. Key Features Defining Attributes: Front-engine, rear-wheel drive V8, transaxle layout, advanced (for its time) technology, luxurious interior, excellent long-distance touring capabilities. 📋 Manual Details Coverage Areas Primary Focus: Electrical System Diagnostics and Repair Page Count Estimated Pages: Varies by specific diagram set, typically 50-150 pages for comprehensive electrical schematics. Manual Type Type: Electrical System Service Manual / Wiring Diagram Supplement Language Language: English Format Format: Printed Document (implied by description, typically sold as a physical copy or high-quality scan) 📖 Manual Coverage Systems Covered Electrical Components: Engine Control Unit (ECU), Fuel Injection System, Ignition System, Lighting (Headlights, Taillights, Interior), Gauges and Instruments, Power Windows, Power Locks, Sunroof, HVAC Controls, Wiper System, Audio System, Cruise Control, Alarm System (if equipped). Engine Management Electrical: ECU functions, sensor inputs (MAP, TPS, CTS, O2), actuator outputs (injectors, ignition coils), troubleshooting ECU faults. Chassis Electrical: Power windows, power seats, power mirrors, central locking system, exterior and interior lighting circuits, wiper/washer system, horn. Instrumentation: Speedometer, tachometer, fuel gauge, coolant temperature gauge, oil pressure gauge, voltmeter, warning lamps, trip computer (if equipped). Comfort Systems: Power seat adjustments, climate control system operation, rear window defroster, heated mirrors (if equipped). Procedures Included Diagnostic Procedures: Circuit tracing, troubleshooting common electrical faults, component testing, relay and fuse identification, wiring harness inspection and repair, connector diagnostics. Wiring Diagrams: Detailed, color-coded wiring diagrams showing component locations, wire routing, connector pinouts, and fuse/relay assignments. Fuse And Relay Locations: Specific identification of all fuses and relays, their amperage ratings, and the circuits they protect. Technical Depth Depth: Advanced Diagnostic and Repair, suitable for professional technicians and experienced DIYers with basic electronics knowledge. Troubleshooting Methodology: Systematic approach to diagnosing electrical faults using a process of elimination and continuity testing. 📊 Manual Specifications File Format Format Details: N/A (assuming print, but if digital, would be PDF/image scans) Print Quality Quality: High-quality reproductions of original factory diagrams, designed for clarity and readability. Binding Type Binding: Likely a stapled booklet or comb-bound for ease of use during repairs. Paper Type Paper Quality: Durable paper stock suitable for workshop environments, often larger format for diagram clarity. Availability Source: Original Porsche factory documentation, often reprinted by specialist automotive publishers. ⚙️ Engine Specifications Primary Engine Engine Type: V8, naturally aspirated Displacement: 4.7 Liters (4664 cc) Bore X Stroke: 95.0 mm x 83.3 mm Compression Ratio: 10.0:1 Performance Horsepower SAE Net: 234 hp @ 5500 rpm Torque SAE Net: 267 lb-ft @ 3500 rpm Fuel System Fuel Delivery: Bosch L-Jetronic Fuel Injection (CIS-Jetronic) Fuel Type: Unleaded Premium Gasoline (91 Octane minimum recommended) Engine Management Ignition System: Electronic Ignition with Knock Sensor Engine Control Unit Model: Bosch Motronic ML-1.3 (or similar early Motronic variant) Cooling System Cooling Type: Water-Cooled 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Transaxle (optional: 5-speed manual transaxle) Optional Manual Transmission Type: 5-Speed Manual Transaxle (WLS - Werkstuning Leightbau Sport) Features Transaxle Layout: Rear-mounted transaxle (transmission and differential combined) for optimal weight distribution. Fluid Specification Automatic Transmission Fluid: Porsche ATF-Z (or equivalent Dexron II/III specification) Manual Transmission Fluid: GL-4 Hypoid Gear Oil (e.g., Mobilube HD 75W-90 or equivalent) 📐 Dimensions Exterior Length: 4656 mm (183.3 in) Width: 1775 mm (69.9 in) Height: 1283 mm (50.5 in) Wheelbase: 2500 mm (98.4 in) Weights Curb Weight: Approx. 1570 kg (3461 lbs) Gross Vehicle Weight Rating: Approx. 1990 kg (4387 lbs) 🛡️ Safety Features Ratings NHTSA Ratings: Not extensively tested by NHTSA under modern protocols. Early Porsche models were designed to robust European safety standards. Active Features Braking System: Four-wheel internally vented disc brakes, ABS (Anti-lock Braking System) standard on 1984 USA models. Suspension: Independent front and rear suspension with transverse leaf springs and longitudinal control arms. Self-leveling rear suspension. Passive Features Occupant Protection: Three-point inertia-reel seatbelts, reinforced passenger cell, energy-absorbing steering column. 💡 Technology Features Infotainment Audio System: Original factory AM/FM stereo with cassette player, often branded like Blaupunkt or Becker. Amplified system with multiple speakers. Driver Assistance ABS: Anti-lock Braking System (ABS) was a significant technological feature for its era. Connectivity Diagnostics Port: Limited integrated diagnostic capabilities compared to modern vehicles. Relies on component-level testing guided by service manuals. 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 - 7,500 miles or 12 months, whichever comes first. Major Service Interval: Timing belt replacement every 30,000 - 50,000 miles or 4-5 years (critical for V8 engine). Fluid Specifications Engine Oil Type: SAE 20W-50 Synthetic or Semi-Synthetic Engine Oil meeting Porsche A40 specification (or equivalent API SH/SJ/SL). Engine Oil Capacity: Approx. 8.5 Liters (9 US Quarts) with filter change. Coolant Type: Ethylene Glycol based coolant with...