🏷️ Basic Information Identification Make: Porsche Model: 951 Year: 1988 Chassis Code: 944S2/951 Generation: Second Generation (944 facelift and turbo variant) Codes Engine Code Designation: M44.51 (Turbo) Transmission Code Designation: G30/M030 (transaxle) 👋 Introduction Market Position Market Segment: Luxury Performance Sports Coupe Positioning: High-performance, track-capable grand tourer with a focus on driver engagement and build quality. Competitive Analysis Primary Competitors: Ferrari 328 GTB, Chevrolet Corvette C4 (ZR-1 variants), Nissan 300ZX Z31 (late models), Toyota Supra Turbo (MkIII). Key Features Powertrain: Turbocharged inline-four cylinder engine, rear-wheel drive, transaxle layout for optimal weight distribution. Design: Aerodynamic styling, Porsche's characteristic build quality, advanced (for its time) suspension and braking systems. Manual Value Proposition: Essential tool for diagnosing and resolving complex electrical issues, saving significant labor costs. 📋 Manual Details Coverage Areas Primary Focus: Bosch DME (Digital Motor Electronics) and related electrical systems Secondary Focus: General electrical troubleshooting, wiring diagrams, component identification Page Count Estimated Pages: N/A (wiring diagrams are typically a series of sheets or a comprehensive booklet) Manual Type Type: Wiring Diagram Manual / Electrical Troubleshooting Manual Language Language: English Format Format: Likely Printed Booklet or High-Resolution Scanned PDF 📖 Manual Coverage Systems Covered Engine Management: Bosch DME L-Jetronic/Motronic variants, fuel injection, ignition system, boost pressure control Lighting: Headlights, taillights, interior lighting, fog lights Instruments Gauges: Speedometer, tachometer, fuel gauge, oil pressure, voltmeter, boost gauge Comfort Convenience: Power windows, power mirrors, central locking, climate control (HVAC blower, basic functions) Audio: Factory radio wiring, speaker circuits Safety Systems: ABS (Anti-lock Braking System) electrical circuits, turn signals, hazard lights Chassis Electronics: Wiper/washer system, horn, starter system, charging system Procedures Included Troubleshooting: Systematic diagnostic procedures for electrical faults, symptom-based troubleshooting Wiring Identification: Color coding, wire gauge, connector pinouts Component Testing: Testing of sensors, actuators, relays, fuses, and electrical modules Repair Guidelines: Instructions for repairing wiring harnesses, replacing connectors and components Technical Depth Depth: Detailed, suitable for experienced technicians and knowledgeable DIY enthusiasts Diagnostics Level: Advanced electrical diagnostics, circuit analysis 📊 Manual Specifications File Format File Format: Likely PDF (if digital) or high-quality print Print Quality Print Quality: High resolution, clear line drawings and text (assumed for usability) Binding Type Binding Type: Spiral bound or saddle-stitched (for print versions to lay flat) Paper Type Paper Type: Durable, matte finish paper suitable for workshop environments (for print versions) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-four, turbocharged, intercooled Displacement: 2479 cc (2.5 Liters) Bore X Stroke: 104.0 mm x 73.0 mm Compression Ratio: 8.5:1 Performance Horsepower: 247 hp (184 kW) @ 6000 rpm Torque: 282 lb-ft (383 Nm) @ 4500 rpm Fuel System Fuel Delivery: Bosch L-Jetronic fuel injection with Bosch Motronic engine management Fuel Type: Premium Unleaded Gasoline (91+ Octane) Ignition System Ignition Type: Distributorless ignition system (DIS) managed by Motronic ECU Cooling System Cooling Type: Water-cooled, thermostatically controlled fan 🔧 Transmission Standard Type: 5-speed manual transaxle Optional Type: Tiptronic automatic (less common on 951, more prevalent on 944 S2, but early S2 could have it) Features Layout: Rear-mounted transaxle for transaxle layout (engine front, gearbox rear) Fluid Type: API GL-4 or GL-5 gear oil (refer to specific Porsche manual for exact spec, e.g., 75W-90) 📐 Dimensions Exterior Length: 4254 mm (167.5 in) Width: 1736 mm (68.3 in) Height: 1270 mm (50.0 in) Wheelbase: 2499 mm (98.4 in) Front Track: 1474 mm (58.0 in) Rear Track: 1474 mm (58.0 in) Weights Curb Weight: Approximately 1370 kg (3020 lbs) Gross Vehicle Weight Rating Gvwr: N/A (typically not specified in this detail for sports cars) 🛡️ Safety Features Ratings Crash Test Results: No formal NHTSA or IIHS ratings available for this specific model year, but known for robust chassis design. Active Features ABS: Standard Bosch ABS (Anti-lock Braking System) Braking System: Four-wheel disc brakes, ventilated front and rear, often with M030 option for larger calipers/rotors. Passive Features Airbags: Driver-side airbag (standard for later production models/market regulations) Seatbelts: Three-point retractable seatbelts Chassis Structure: Reinforced safety cage structure, crumple zones 💡 Technology Features Infotainment Audio System: Factory premium sound system with cassette player, potential for upgraded head units. Driver Assistance ABS: Bosch ABS system for enhanced braking control. Connectivity N/A: No integrated connectivity features like Bluetooth or USB as standard. 🔧 Maintenance Service Intervals Oil Change: Every 5,000-7,500 miles or annually, whichever comes first. Use synthetic oil. Timing Belt: Every 30,000-50,000 miles or 3-5 years. Critical maintenance item. Spark Plugs: Inspect at 15,000 miles, replace as needed (typically every 30,000 miles). Fluid Specifications Engine Oil: API SG, ACEA A2/B2 rated synthetic oil, 10W-30 or 5W-40 recommended (e.g., Mobil 1 5W-30/40 or equivalent). Coolant: 50/50 mix of Porsche-approved G12 coolant and distilled water. Brake Fluid: DOT 4 or DOT 5.1, low-moisture content. Known Issues Electrical Concerns: Degradation of wiring insulation (especially around engine bay and rear hatch), faulty headlight relays, coolant level sensor issues, ABS sensor failure. Mechanical Concerns: Timing belt...