🏷️ Basic Information Identification Make: BMW Model: 3-Series M3 Chassis Code: E30 Production Years Covered By Manual: 1986-1991 Market Region: United States (US) 👋 Introduction Market Position Segment: Compact Executive Sports Sedan/Coupe Target Audience: Enthusiasts, DIY mechanics, professional workshops Competitive Analysis Key Competitors Era: Porsche 944, Mercedes-Benz 190E 2.3-16, Ford Sierra RS Cosworth Key Features Vehicle Motorsport Homologation: Developed for Group A Touring Car racing homologation Key Features Manual Practical Value: Essential for owners seeking to maintain and repair their M3 accurately and efficiently. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual Language: English Format: Print Book Primary Coverage Focus: Repair and Servicing 📖 Manual Coverage Systems Covered Engine: S14 Engine (2.3L I4 DOHC) Engine Management: Bosch Motronic ML/M3.3 EFI System Transmission: Getrag 265 5-Speed Manual Transmission Drivetrain: Rear-Wheel Drive (RWD), Limited-Slip Differential (LSD) Suspension: Front MacPherson Struts, Rear Independent Trailing Arms, Bilstein Dampers (Stock) Brakes: Front: Ventilated Discs, Rear: Solid Discs, ABS Steering: Power Assisted Rack and Pinion Fuel System: Bosch Fuel Injection, In-Tank Fuel Pump Exhaust System: Dual Catalytic Converters, Stainless Steel Construction (Stock) Cooling System: Radiator, Fan Clutch, Expansion Tank Electrical System: Battery, Alternator, Starter, Wiring Diagrams, Fuses, Relays Body And Chassis: Unibody Construction, Body Panels, Doors, Hood, Trunk, Aerodynamics Interior: Seats, Dashboard, Trim, HVAC Controls Procedures Included Scheduled Maintenance: Oil Changes, Filter Replacements, Spark Plug Service, Belt Inspections Engine Overhaul: Engine Disassembly, Reassembly, Component Inspection, Valve Adjustments Transmission Repair: Clutch Replacement, Gearbox Rebuild, Shifter Linkage Adjustment Brake System Service: Brake Pad Replacement, Rotor Machining/Replacement, Fluid Bleeding, ABS System Diagnosis Suspension And Steering Repair: Shock/Strut Replacement, Bushing Replacement, Ball Joint Service, Power Steering Pump Repair Electrical Troubleshooting: Diagnosis of common electrical faults, wiring harness repair, component testing Fuel System Diagnosis: Fuel pressure testing, injector cleaning/replacement, fuel pump diagnosis Cooling System Maintenance: Coolant flush and fill, thermostat replacement, water pump service Body Panel Replacement: Fender, Hood, Trunk, Door Panel Replacement and Adjustment HVAC System Repair: Blower motor replacement, evaporator core service, refrigerant system service (cautionary notes) Troubleshooting Guides: Diagnostic flowcharts for common problems Technical Depth Diagnostic Capabilities: Advanced Diagnostics, Component Testing, Fault Code Interpretation (where applicable for era) Rebuild Procedures: Complete Engine and Transmission Rebuild Procedures Special Tools: Identification and use of BMW-specific special tools 📊 Manual Specifications File Format Physical Format: Printed Paperback Book Illustration Quality: Detailed diagrams, illustrations, and photographic representations Print Quality Paper Type: Durable, high-quality paper suitable for workshop environments Binding Type Binding: Staple-bound or perfect-bound for durability Coverage Completeness Page Count: Estimated 500-800+ pages (typical for comprehensive workshop manuals of this era) ⚙️ Engine Specifications Primary Engine Engine Code: S14 Engine Type: Naturally Aspirated Inline 4-Cylinder Displacement: 2302 cc (2.3 Liters) Bore X Stroke: 91.0 mm x 87.0 mm Compression Ratio: 10.3:1 Performance Horsepower Us Spec: 192 hp @ 6,400 rpm (Catalytic Converter equipped models) Torque Us Spec: 170 lb-ft @ 4,900 rpm Fuel System Fuel Delivery: Bosch Motronic ML/M3.3 Electronic Fuel Injection (EFI) Fuel Type: Premium Unleaded Gasoline (91+ Octane) Cylinder Head Valve Train: Dual Overhead Camshafts (DOHC), 4 Valves per Cylinder Timing Mechanism: Single Silent Chain 🔧 Transmission Standard Transmission Type: Getrag 265 5-Speed Manual Gear Ratios Approx: 1st: 3.72, 2nd: 2.40, 3rd: 1.71, 4th: 1.21, 5th: 1.00, Reverse: 3.73 Features Clutch Type: Single Dry Plate, Hydraulic Actuation Differential: Limited-Slip Differential (LSD), 25% Locking Factor (Standard) Fluid Specifications Gearbox Oil Type: SAE 75W-90 GL-4 or GL-5 (BMW recommended) 📐 Dimensions Exterior Wheelbase: 2565 mm (101.0 in) Length: 4430 mm (174.4 in) Width: 1700 mm (66.9 in) Height: 1370 mm (53.9 in) Track Width Front: 1430 mm (56.3 in) Track Width Rear: 1400 mm (55.1 in) Weights Curb Weight Approx: 1200-1250 kg (2645-2755 lbs) Gross Vehicle Weight Rating Approx: 1700 kg (3748 lbs) Wheels And Tires Standard Wheel Size: 16 x 7.0 inches (Style 29 'bottlecap' or TRX variant) Standard Tire Size: 205/55VR16 Bolt Pattern: 5 x 120 mm Center Bore: 72.6 mm 🛡️ Safety Features Ratings Crash Test Data Availability: Limited official NHTSA/IIHS data for this specific era and model, but considered robust for its time. Active Features ABS: Anti-lock Braking System (Bosch ABS II) Standard Passive Features Seatbelts: 3-point front seatbelts, 2-point rear seatbelts (early models) / 3-point rear seatbelts (later models) Body Structure: Reinforced passenger cell, crumple zones Steering Column: Collapsible steering column 💡 Technology Features Infotainment Audio System: Factory optional BMW Bavaria C Reverse RDS stereo system with cassette player. Speakers: Typically 4-6 speaker system depending on trim and options. Driver Assistance ABS System: Bosch ABS II system (rear-wheel specific on early models, four-wheel on later ones). Connectivity Factory Options: Optional cruise control, power windows, sunroof. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles or 12,000 km (or as indicated by Oil Service indicator) Engine Oil Type: SAE 15W-50 Synthetic or 20W-50 (BMW HP Grade recommended, e.g., Castrol GTX or similar) Oil Capacity:...