🏷️ Basic Information Identification Make: BMW Model: M3 Chassis Code: E30 Model Year: 1990 Codes Engine Code: S14B23 Internal Model Code: M3 Evolution III 👋 Introduction Market Position Vehicle Segment: Compact Executive Sports Coupe Enthusiast Status: Highly sought-after homologation special, iconic status Competitive Analysis Key Rivals: Porsche 944, Ford Sierra RS Cosworth, Mercedes-Benz 190E 2.3-16 Key Features Design Origin: Touring car homologation special derived from the E30 3 Series platform Aerodynamics: Distinctive front air dam, rear spoiler, and side skirts Chassis Enhancements: Wider track, revised suspension geometry, M-specific chassis bracing 📋 Manual Details Coverage Areas Coverage Type: Comprehensive Service, Repair, and Workshop Page Count Estimated Pages: 800+ Manual Type Type: Workshop Manual / Service Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Engine: S14B23 2.3L Inline-4 DOHC 16-valve Fuel System: Bosch Motronic M1.3 Fuel Injection, Fuel Pump, Injectors, Pressure Regulator Ignition System: Electronic Ignition, Spark Plugs, Coils, Ignition Control Module Cooling System: Radiator, Fan, Water Pump, Thermostat, Hoses, Coolant Specifications Exhaust System: Exhaust Manifold, Catalytic Converter, Muffler, Oxygen Sensor Transmission: Getrag 265 5-speed Manual Transmission Clutch: Clutch Assembly, Flywheel, Master/Slave Cylinders, Hydraulic Lines Drivetrain: Driveshaft, Universal Joints, Rear Differential, Axles Suspension: Front McPherson Struts, Rear Independent Suspension, Control Arms, Bushings, Sway Bars Steering: Power Steering System, Steering Rack, Tie Rods, Steering Column Brakes: Front and Rear Disc Brakes, ABS (Anti-lock Braking System), Brake Calipers, Master Cylinder, Fluid Specifications Electrical System: Battery, Alternator, Starter Motor, Fuses, Relays, Wiring Diagrams Lighting System: Headlights, Taillights, Interior Lights, Turn Signals Interior: Dashboard, Seats, Trim Panels, HVAC Controls Bodywork: Body Panels, Doors, Hood, Trunk, Bumpers, Aerodynamics HVAC: Air Conditioning System, Heater Core, Blower Motor, Controls Procedures Included Maintenance: Routine Service, Oil Changes, Filter Replacements, Spark Plug Changes, Brake Fluid Flush Repair: Engine Rebuild, Transmission Overhaul, Suspension Component Replacement, Brake System Repair Diagnostics: Troubleshooting Common Issues, Fault Code Interpretation, Component Testing Specifications: Torque Values, Tolerances, Fluid Capacities, Electrical Schematics Troubleshooting: System-by-system fault finding guides Technical Depth Depth: In-depth, suitable for professional mechanics and advanced DIY enthusiasts Detail Level: Step-by-step instructions, detailed diagrams, and technical explanations 📊 Manual Specifications File Format File Type: PDF Searchability: Text-searchable for quick information retrieval Print Quality Resolution: High-resolution scans for clear diagrams and text Binding Type Binding: N/A (Digital) Paper Type Paper Quality: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline-4 Engine Code: S14B23 Displacement: 2302 cc (2.3 Liters) Bore X Stroke: 91 mm x 87 mm Compression Ratio: 10.5:1 Valvetrain: DOHC, 4 valves per cylinder Performance Horsepower: 218 hp (163 kW) @ 6750 rpm (European spec) Torque: 230 Nm (170 lb-ft) @ 4750 rpm (European spec) Fuel System Fuel Delivery: Bosch Motronic M1.3 Fuel Injection Fuel Type: Unleaded Premium (91+ Octane) Ignition System Ignition Type: Distributorless Electronic Ignition (DIS) 🔧 Transmission Standard Type: 5-speed Manual Manufacturer Model: Getrag 265 Optional Type: Not Available for M3 Features Differential: Limited-Slip Differential (LSD) standard Gear Ratios: Refer to manual for specific ratios (dogleg 1st gear on some variants) Fluid Specifications Transmission Fluid: BMW MTF LT-2 or equivalent (check manual for exact spec) 📐 Dimensions Exterior Length: 4346 mm (171.1 in) Width: 1700 mm (66.9 in) Height: 1370 mm (53.9 in) Wheelbase: 2564 mm (100.9 in) Front Track: 1471 mm (57.9 in) Rear Track: 1480 mm (58.3 in) Weights Curb Weight: 1200 kg (2645 lbs) approx. Gross Vehicle Weight Rating: Refer to manual Wheels Tires Wheel Bolt Pattern: 5x120 Standard Wheel Size: 15 x 7 inches Standard Tire Size: 205/55 VR 15 🛡️ Safety Features Ratings Crash Test Ratings: NHTSA (US-spec relevant for period), IIHS. Refer to specific crash data if available. Active Features ABS: Standard (Bosch ABS II) Passive Features Airbags: Driver's airbag optional/late model, not standard on all 1990 models Seatbelts: 3-point inertia reel seatbelts front Rollover Protection: Reinforced A-pillars, integrated roll bar structure (coupe) 💡 Technology Features Infotainment Radio: Factory BMW Bavaria C II or similar cassette/radio system Speakers: Factory speaker system Driver Assistance ABS: Bosch ABS II standard Connectivity Aux Input: Not available from factory 🔧 Maintenance Service Intervals Oil Change Interval: Typically 7,500 - 10,000 miles or 12 months (refer to manual for exact recommendation) Spark Plug Replacement: Refer to manual, typically 30,000 - 60,000 miles depending on plug type Timing Belt Replacement: S14 engine uses a timing chain, not a belt. Refer to manual for inspection. Fluid Specifications Engine Oil Capacity: 5.5 Liters (5.8 US Quarts) Engine Oil Type: Synthetic SAE 15W-50 or 20W-50 recommended for performance use (check manual for specific BMW approvals) Coolant Type: BMW Blue Antifreeze/Coolant (G48) or equivalent Brake Fluid: DOT 4 High-Temperature Brake Fluid Known Issues Engine Wear: Potential for valve guide wear, VANOS issues (though S14 is not VANOS, early E30 engines had some issues), oil consumption Suspension Bushings: Wear on control arm bushings, rear trailing arm bushings Rust: Common E30 vulnerability,...