🏷️ Basic Information Identification Make: BMW Model: M3 Chassis Code: E30 Model Years Covered: 1987-1991 Codes Engine Code Primary: S14 👋 Introduction Market Position Vehicle Segment: Compact Executive Sports Sedan/Coupe Performance Focus: Homologation special for racing, road-legal performance variant Competitive Analysis Key Competitors: Porsche 944, Mercedes-Benz 190E 2.3-16/2.5-16, Ford Sierra RS Cosworth, Alfa Romeo 75 Key Features Handling Dynamics: Renowned for precise steering, balanced chassis, and exceptional driver feedback Engine Development: Purpose-built, high-revving 4-cylinder engine derived from motorsport Aerodynamics: Distinctive box-flared fenders, revised front/rear spoilers for improved downforce 📋 Manual Details Coverage Areas Diagnostic Systems: Engine Management, ABS, Check Control, Body Electronics, HVAC, Instrument Cluster Mechanical Systems: Engine, Fuel System, Ignition System, Cooling System, Lubrication System, Drivetrain, Suspension, Steering, Brakes Electrical Systems: Starting System, Charging System, Lighting, Wipers, Washers, Power Windows, Central Locking, Audio System, Cruise Control Page Count Estimated Pages: 100+ Manual Type Type: Wiring Diagram Manual Language Language: English Format Format: PDF Downloadable Availability: YES Compatibility Operating Systems: All Versions of Windows & Mac Requirements Software: Adobe PDF Reader 📖 Manual Coverage Systems Covered Engine Electrical: Full engine wiring harness, ECU connections, sensor wiring (Crankshaft Position Sensor, Camshaft Position Sensor, Knock Sensor, Temperature Sensors, Lambda Sensor) Ignition System: Ignition coil, distributor (if applicable to specific E30 M3 variant), ECU control signals Fuel Injection: Fuel pump relay, injectors, Air Flow Meter (AFM) or Manifold Absolute Pressure (MAP) sensor, fuel pressure regulator wiring Starting Charging: Starter motor, alternator, battery connections, ignition switch wiring Lighting Exterior: Headlights (low/high beam), taillights, brake lights, turn signals, fog lights, license plate lights Lighting Interior: Dome light, courtesy lights, dashboard illumination, glove box light Instrumentation: Speedometer, tachometer, fuel gauge, temperature gauge, oil pressure warning light, Check Control indicators Climate Control: HVAC blower motor, temperature controls, recirculation flap actuators, AC compressor clutch wiring Windows Locks: Power window motors and switches, central locking system wiring Wipers Washers: Wiper motor, washer pump, intermittent wiper module (if equipped), switch wiring Audio System: Radio wiring, speaker connections, antenna wiring Cruise Control: System components and control module wiring (if equipped) ABS: ABS control module, wheel speed sensors, hydraulic unit wiring Procedures Included Troubleshooting Guides: Wiring fault diagnosis, component testing, common electrical issue resolution Component Identification: Clear identification of electrical components, relays, fuses, and connectors Wiring Harness Routing: Visual representation of wiring harness paths throughout the vehicle Connector Pinouts: Detailed pinout diagrams for major ECUs and connectors Fuse Relay Locations: Identification and function of all fuses and relays Technical Depth Depth Level: Comprehensive Electrical System Diagnosis and Repair 📊 Manual Specifications File Format Format: PDF Print Quality Printability: All pages are printable Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline-4 (DOHC, 16-valve) Displacement: 2.3 Liters (2302 cc) Bore X Stroke: 91.0 mm x 89.6 mm Compression Ratio: 10.5:1 Performance Horsepower Us Spec: 192 hp @ 6900 rpm Torque Us Spec: 170 lb-ft @ 4750 rpm Horsepower Euro Spec: 200 hp @ 6900 rpm (Catalytic Converter equipped models, some variations) Torque Euro Spec: 177 lb-ft @ 4750 rpm (Catalytic Converter equipped models, some variations) Redline: 7250 rpm Fuel System Fuel Delivery: Bosch L-Jetronic Fuel Injection (later models may feature Motronic variants) Fuel Type Required: Premium Unleaded Gasoline (91+ Octane) Lubrication System Oil Capacity: 5.5 Liters (5.8 US Quarts) Oil Filter Part Number Example: Mann-Filter W90, Mahle OC 27 Cooling System Coolant Capacity: 8.0 Liters (8.5 US Quarts) 🔧 Transmission Standard Transmission Type: Getrag 265 5-speed Manual Gear Ratios Close Ratio: 1st: 3.72, 2nd: 2.40, 3rd: 1.77, 4th: 1.30, 5th: 1.00 Gear Ratios Dogleg Shift Pattern: 1st: 3.72, 2nd: 2.40, 3rd: 1.77, 4th: 1.30, 5th: 1.00 (Note: 1st gear is to the left and down, common on performance variants) Optional Transmission Type: None (M3 exclusively manual) Features Clutch Type: Hydraulically actuated single dry plate Differential: Limited-Slip Differential (LSD) standard Transmission Fluid Type: BMW Synthetic Gear Oil (e.g., SAE 75W-90 GL-5) Transmission Fluid Capacity: 1.2 Liters (1.3 US Quarts) 📐 Dimensions Exterior Length: 4330 mm (170.5 in) Width: 1700 mm (66.9 in) Height: 1370 mm (53.9 in) Wheelbase: 2565 mm (101.0 in) Front Track: 1430 mm (56.3 in) Rear Track: 1430 mm (56.3 in) Weights Curb Weight: Approx. 1200-1250 kg (2645-2755 lbs) Gross Vehicle Weight Rating Gvwr: Approx. 1600 kg (3527 lbs) Towing Capacity: Not Recommended/Specified Wheels Tires Standard Wheel Size: 15 x 7.0J (early models), 16 x 7.5J (later models) Standard Tire Size: 205/55 VR 15 (early models), 225/45 VR 16 (later models) Bolt Pattern: 5x120 mm Center Bore: 72.5 mm 🛡️ Safety Features Ratings Crash Test Data: Limited specific modern crash test data available; based on E30 platform standards of the era. Active Features ABS: Standard on most E30 M3 models (Bosch ABS II) Brakes Front: Ventilated Disc, 280 mm diameter Brakes Rear: Solid Disc, 272 mm diameter...