🏷️ Basic Information Identification Make: BMW Model: M3 Generation: E30 Model Year: 1990 Codes Chassis Code: E30 👋 Introduction Market Position Positioning: The BMW E30 M3 is a legendary homologation special, celebrated for its racing pedigree and exceptional driving dynamics. This manual caters to owners and enthusiasts dedicated to preserving and maintaining this iconic performance vehicle. Competitive Analysis Competitors: Competed with high-performance coupes of its era such as the Porsche 944, Mercedes-Benz 190E 2.3-16 Cosworth, and Ford Sierra RS Cosworth. Its unique character and motorsport focus set it apart. Key Features Manual Value Proposition: Provides the definitive factory-level documentation required for accurate diagnosis, maintenance, and repair, ensuring the longevity and performance of the E30 M3. 📋 Manual Details Coverage Areas Manual Type: Factory Service Repair Manual Language: English Format: Downloadable PDF Page Count Estimated Page Count: Hundreds (specific number not provided, but implies comprehensive) 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical (S14B23), fuel injection (Bosch Motronic), ignition, cooling, lubrication, exhaust. Transmission Systems: Manual transmission (Getrag 265), clutch, driveline, differential. Chassis Systems: Suspension (front struts, rear semi-trailing arms), steering, brakes (ABS optional), wheels, tires. Electrical Systems: 12V electrical system, battery, alternator, starter, lighting, instrumentation, fuses, relays, engine control unit (ECU) wiring. Body And Interior: Body panels, doors, windows, locks, seats, trim, HVAC, sound system. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks, tune-ups. Troubleshooting: Diagnostic procedures, fault finding for all major systems, electrical schematics interpretation. Repair And Rebuild: Component removal, installation, overhaul, and rebuilding procedures for engine, transmission, suspension, brakes, etc. Technical Specifications: Detailed torque specifications, clearances, tolerances, fluid capacities, and electrical values. Technical Depth Depth: Comprehensive, covering from basic maintenance to complex repairs and diagnostics. Suitable for professional technicians and experienced enthusiasts. 📊 Manual Specifications File Format Format: PDF (Portable Document Format) Searchability: Likely text-searchable due to being a factory manual PDF, allowing quick access to specific information. Print Quality Printability: High-quality, allowing for printing of the entire manual or individual pages as needed. Binding Type Binding: N/A (Digital Download - PDF) Paper Type Paper Type: N/A (Digital Download - PDF) ⚙️ Engine Specifications Primary Engine Engine Code: S14B23 Engine Type: Naturally Aspirated Inline 4-Cylinder Displacement: 2.3 Liters (2302 cc) Performance Horsepower: 192 hp @ 6,750 rpm (Euro Spec), 192 hp @ 6,750 rpm (US Spec with catalytic converter) Torque: 170 lb-ft @ 4,750 rpm (Euro Spec), 170 lb-ft @ 4,750 rpm (US Spec) Fuel System Fuel Delivery: Bosch Motronic Electronic Fuel Injection (EFI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management Engine Control Unit: Bosch Motronic M1.3 Engine Internals Bore X Stroke: 91 mm x 87 mm Compression Ratio: 10.5:1 🔧 Transmission Standard Transmission Type: 5-Speed Manual Gearbox Model: Getrag 265 Optional Optional Transmission: None (E30 M3 was exclusively manual) Features Clutch Type: Hydraulically Actuated Single Dry Plate Differential: Limited-Slip Differential (LSD) standard 📐 Dimensions Exterior Length: 4330 mm (170.5 in) Width: 1700 mm (66.9 in) Height: 1370 mm (53.9 in) Wheelbase: 2564 mm (100.9 in) Weights Curb Weight: Approx. 1200 kg (2646 lbs) Gross Vehicle Weight Rating: Approx. 1650 kg (3638 lbs) Wheels Tires Wheel Bolt Pattern: 5 x 120 mm Standard Wheel Size: 15 x 7 inches (early), 15 x 7.5 inches (later/optional) Standard Tire Size: 205/50 VR 15 🛡️ Safety Features Ratings Crash Test Results: Specific official ratings from major agencies like NHTSA/IIHS for the 1990 E30 M3 are not readily available for this era of vehicle. However, BMWs of this period were known for robust construction. Active Features ABS: Optional Anti-lock Braking System (ABS) Traction Control: No electronic traction control Passive Features Airbags: No airbags standard for 1990 model year. Seatbelts: Three-point inertia-reel seatbelts front and rear. Chassis Design Rollover Protection: Reinforced A-pillars and body structure. 💡 Technology Features Infotainment Audio System: Factory installed Bavarian Radio (e.g., Bavaria C Reverse II), optional CD player. Basic analog systems. Driver Assistance Cruise Control: Optional cruise control system. Connectivity Connectivity Features: No modern connectivity features (Bluetooth, USB, etc.). Primarily mechanical and electrical systems. 🔧 Maintenance Service Intervals Oil Change Interval: Recommended every 5,000 - 7,500 miles or annually, depending on driving conditions. Check manual for specific recommendations. Major Service Intervals: Timing belt (if applicable, though S14 has chain), spark plugs, valve adjustments typically every 30,000 - 60,000 miles. Refer to manual for precise intervals. Fluid Specifications Engine Oil: SAE 15W-50 or 20W-50 synthetic recommended for optimal performance and protection, especially under hard driving. Check manual for BMW approvals. Coolant: BMW Blue Coolant (G48) or equivalent ethylene glycol-based coolant mixed 50/50 with distilled water. Brake Fluid: DOT 4 brake fluid. Transmission Fluid: Manual Transmission Fluid (MTF), e.g., GL-4 specification. Manual will specify BMW part number or equivalent. Differential Fluid: Limited-Slip Differential (LSD) fluid with friction modifier, e.g., GL-5 specification. Manual will specify BMW part number or equivalent. Known Issues Common...