Basic Information Identification Make: BMW Model: M3 Chassis Code: E30 Codes Applicable Years: 1981-1992 Market Segment: Performance Compact Sedan/Coupe Introduction Market Position Positioning: Iconic homologation special, celebrated for its motorsport pedigree and driving dynamics Competitive Analysis Competitors: Ford Sierra RS Cosworth, Audi Quattro, Mercedes-Benz 190E 2.3-16 Cosworth Key Features Performance Focus: Designed for racing homologation, resulting in enhanced chassis, suspension, and engine performance Design Elements: Distinctive box flares, front air dam, rear spoiler, and side skirts Manual Details Coverage Areas Manual Type: Service and Repair Manual Language: English Format: PDF Download Coverage Scope: Comprehensive mechanical and electrical service Manual Coverage Systems Covered Engine: Detailed diagnostics, repair, and overhaul for S14 engine variants Fuel System: Bosch Motronic fuel injection system diagnosis and repair, fuel pump, injectors, fuel pressure regulator Ignition System: Ignition timing, coil packs, spark plugs, distributorless ignition system components Cooling System: Radiator, water pump, thermostat, fan, coolant flow diagnostics Exhaust System: Catalytic converter, exhaust manifold, muffler, O2 sensors Transmission: Getrag 265 5-speed manual transmission overhaul, clutch service, driveshaft, differential Suspension: Front MacPherson struts, rear trailing arms, bushings, anti-roll bars, shock absorbers, alignment specifications Steering: Power steering system, steering rack, tie rods, steering column Brakes: Front vented discs, rear solid discs, ABS system (where applicable), brake lines, caliper overhaul Electrical System: Wiring diagrams, starter, alternator, battery, lighting, fuses, relays, ECU troubleshooting Bodywork: Panel removal and installation, body repair guidelines, aerodynamics (aero kit) HVAC: Heating, ventilation, and air conditioning system service Procedures Included Maintenance: Oil changes, filter replacements, spark plug service, brake fluid flush, coolant service, belt inspection/replacement Troubleshooting: Systematic diagnostic procedures for common and uncommon faults Repair: Step-by-step repair instructions for all major components and systems Overhaul: Complete engine and transmission overhaul procedures Diagnostics: Fault code reading (OBD I), sensor testing, circuit analysis Technical Depth Depth: Expert-level, suitable for professional technicians and advanced DIY enthusiasts Detail Level: Detailed torque specifications, clearances, and measurement data Manual Specifications File Format File Type: Digital PDF Searchability: Text-searchable for quick access to information Print Quality: High-resolution, printable pages Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) Engine Specifications Primary Engine Engine Code: S14 Engine Type: Naturally Aspirated Inline-4 Displacement: 2.3 Liters (2302 cc) Bore X Stroke: 93.75 mm x 83.00 mm Compression Ratio: 10.5:1 Horsepower: 192 hp @ 6100 rpm (Euro Spec), 200 hp @ 6100 rpm (Catalytic Converter Spec) Torque: 235 Nm (173 lb-ft) @ 4750 rpm Performance 0-60 Mph: Approx. 6.5 - 7.0 seconds Top Speed: Approx. 140 mph (225 km/h) Fuel System Injection Type: Bosch Motronic EFI Fuel Type: Premium Unleaded (91+ Octane) Engine Management ECU Type: Bosch Motronic (various revisions depending on market/year) Transmission Standard Type: Getrag 265 5-speed manual Optional Type: None Features Clutch: Single dry plate, hydraulic actuation Differential: Limited Slip Differential (LSD) standard on M3 models Fluid Specifications Transmission Fluid: BMW Manual Gearbox Oil (e.g., ATF Dexron III or equivalent) Fluid Capacities Transmission Capacity: Approx. 1.5 Liters Dimensions Exterior Length: 4340 mm (170.9 in) Width: 1700 mm (66.9 in) / 1770 mm (69.7 in) with aero kit Height: 1370 mm (53.9 in) Wheelbase: 2565 mm (100.9 in) Track Width Front: 1402 mm (55.2 in) Track Width Rear: 1430 mm (56.3 in) Weights Curb Weight: Approx. 1200 kg (2646 lbs) Gross Weight: Approx. 1600 kg (3527 lbs) Wheels Tires Wheel Size: 15x7 inches (standard), 15x7.5 inches (optional alloy) Bolt Pattern: 5x120 Tire Size: 205/50 VR 15 (standard) Safety Features Ratings Crash Test Data: Limited official ratings for the era, but designed with safety cage principles Active Features ABS: Optional ABS system on later models Braking System: Large vented front discs and rear discs for improved stopping power Passive Features Airbags: Not standard, optional on later models Seatbelts: 3-point inertia reel seatbelts Body Construction: Reinforced passenger safety cell Technology Features Infotainment Audio System: Basic factory radio with cassette player, optional CD player on later models. Aftermarket upgrades common. Driver Assistance ABS: Optional anti-lock braking system. Connectivity Features: Limited by era; primarily analog systems, no Bluetooth or USB standard. Maintenance Service Intervals Oil Change: Every 5,000 - 7,500 miles or 6-12 months, depending on driving conditions Air Filter: Inspect every 7,500 miles, replace as needed or every 15,000 - 30,000 miles Spark Plugs: Replace every 15,000 - 30,000 miles (depending on plug type) Brake Fluid Flush: Every 2 years Coolant Flush: Every 2-3 years Fluid Specifications Engine Oil: 10W-40 or 15W-50 Synthetic (e.g., Castrol, Mobil 1) - consult specific manual for exact BMW specs Coolant: BMW Blue Antifreeze/Coolant (G48) or equivalent ethylene glycol-based Fluid Capacities Engine Oil Capacity: Approx. 5.0 Liters (with filter) Coolant Capacity: Approx. 7.5 Liters Known Issues Engine Sludge: Potential for oil sludge buildup if maintenance is neglected, especially on earlier S14 engines. Valve Adjustment: Requires periodic valve lash adjustment (solid lifters). Subframe Mounts: Cracking or separation of rear subframe mounting points is a common...