🏷️ Basic Information Identification Make: BMW Model: M3 Generation: E30 Model Year: 1991 Chassis Code: E30 Engine Code: S14 👋 Introduction Market Position Positioning: The BMW E30 M3 is a legendary homologation special, a highly sought-after performance variant of the iconic E30 chassis, aimed at enthusiasts and collectors. Competitive Analysis Competitors 1991: Competed with performance coupes of its era such as the Porsche 911 (964), Ford Sierra RS Cosworth, Lancia Delta Integrale Evoluzione, and Mercedes-Benz 190E 2.3-16/2.5-16. Key Features Design Philosophy: Developed for motorsport homologation, featuring wider track, flared fenders, revised suspension geometry, and a potent naturally aspirated engine. Aerodynamics: Distinctive front air dam, rear spoiler, and box flares for improved aerodynamics and stability at high speeds. Driving Dynamics: Renowned for its balanced chassis, direct steering, and engaging driving experience. 📋 Manual Details Coverage Areas Coverage: Full service, repair, and diagnostic instructions for the BMW E30 M3 (1991 model year). Page Count Pages: Extensive (precise count not provided, but implies comprehensive coverage typical of workshop manuals). Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: Likely printed (traditional workshop manual format) or digital (PDF) depending on the specific product offering. 📖 Manual Coverage Systems Covered Engine: Engine mechanical, lubrication, cooling, fuel injection (Bosch Motronic), ignition, exhaust systems. Transmission: Manual transmission (Getrag 265), clutch system, driveshafts, differential. Brakes: Front and rear disc brake systems (including ABS if equipped), hydraulic circuits, parking brake. Suspension: Front and rear suspension components, steering system, shock absorbers, springs, control arms, bushings. Electrical: Complete electrical system, wiring diagrams, battery, alternator, starter, lighting, instrumentation, ECUs. Bodywork: Body structure, exterior panels, doors, hood, trunk, bumpers, interior trim, body sealing. HVAC: Heating, ventilation, and air conditioning (HVAC) system operation and service. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, spark plug service, fluid checks and top-offs. Troubleshooting: Diagnostic procedures, fault finding, common issues and their resolutions. Repair: Detailed step-by-step repair instructions for all major components and systems. Rebuild: Comprehensive engine and transmission rebuild procedures, including torque specifications and clearances. Alignment: Wheel alignment specifications and procedures. Diagnostics: On-board diagnostics (OBD) information and troubleshooting for engine management. Technical Depth Depth: Comprehensive, covering basic maintenance to full engine and transmission rebuilds, including electrical system diagnostics and bodywork repairs. 📊 Manual Specifications File Format Quality: High resolution, clear diagrams and text (assuming a professionally produced manual). Searchability: Likely searchable if in PDF format, allowing for quick access to specific topics. Print Quality Print Quality: Professional, typically with durable paper and clear, legible printing for workshop use. Binding Type Binding: Spiral-bound or sturdy comb binding often preferred for workshop manuals to lay flat. Paper Type Paper: Durable, often matte finish paper to reduce glare in workshop environments. ⚙️ Engine Specifications Primary Engine Engine Type: Inline 4-cylinder, naturally aspirated, DOHC, 16-valve Engine Code: S14 Displacement: 2.3 Liters (2302 cc) Performance Horsepower: 192 hp @ 6,900 rpm (US Spec), 200 hp @ 6,900 rpm (Euro Spec) Torque: 170 lb-ft @ 4,750 rpm (US Spec), 170 lb-ft @ 4,750 rpm (Euro Spec) Redline: 7,250 rpm Fuel System Injection System: Bosch Motronic ML 1.3 Fuel Injection Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Components Bore X Stroke: 91 mm x 84 mm Compression Ratio: 9.5:1 🔧 Transmission Standard Transmission Type: 5-Speed Manual Transmission Model: Getrag 265 Optional Optional Transmission: None (M3 was exclusively manual transmission). Features Gear Ratios Final Drive: Specific ratios for the Getrag 265 and final drive vary but are optimized for performance. Often 3.15:1 or similar. Transmission Fluid Fluid Type: BMW recommends specific manual transmission fluid (e.g., ATF Dexron II/III or equivalent specialized gear oil). Consult manual for exact part numbers. 📐 Dimensions Exterior Length: Approx. 4415 mm (173.8 in) Width: Approx. 1700 mm (66.9 in) Height: Approx. 1370 mm (53.9 in) Wheelbase: Approx. 2565 mm (101 in) Weights Curb Weight: Approx. 1200 kg (2646 lbs) Gross Weight: Varies by specification. Wheels Tires Wheel Size: 15-inch alloy wheels (standard), 16-inch optional. Tire Size: Front: 205/50 VR 15, Rear: 225/45 VR 15 (typical standard fitment). Bolt Pattern: 5 x 120 mm 🛡️ Safety Features Ratings Crash Test History: While specific ratings for the 1991 E30 M3 might not align with modern standards, the E30 platform was known for its robust safety cage and chassis design for its era. Testing was less standardized then. Active Features ABS: Anti-lock Braking System (ABS) was often an option or standard on later models, including the 1991 M3. Braking System: Powerful front and rear disc brakes, often with larger rotors and calipers compared to standard E30 models. Passive Features Airbags: Driver's side airbag may have been standard or optional depending on market and specific build date. Seatbelts: Three-point inertia-reel seatbelts, often with pre-tensioners. Body Structure: Reinforced chassis, safety crumple zones. 💡 Technology Features Infotainment Audio System: Period-appropriate BMW Bavaria C Business or Professional cassette...