🏷️ Basic Information Identification Make: BMW Model: 325i Year: 1990 Codes Chassis Code: E30 👋 Introduction Market Position Target Audience: BMW E30 enthusiasts, DIY mechanics, restoration specialists. Competitive Analysis Value Proposition: Provides comprehensive, OEM-level information for maintaining and repairing a classic BMW model, saving significant costs compared to dealer service. Key Features Completeness: Covers all major mechanical, electrical, and body systems, making it a definitive resource for the 1990 325i. Diagnostic Focus: Emphasizes diagnostic procedures to help identify and resolve issues efficiently. 📋 Manual Details Coverage Areas Manual Type: Full Service & Repair Manual Language: English Format: Digital (likely PDF, though not explicitly stated, common for such manuals) Page Count Estimated Page Count: 500+ 📖 Manual Coverage Systems Covered Engine Mechanical: Engine overhaul, cylinder head, crankshaft, connecting rods, pistons, timing belt/chain, lubrication system, cooling system, fuel delivery. Engine Management: Fuel injection system (Bosch Motronic), ignition system, engine control unit (ECU), sensors (MAP, TPS, O2, coolant temp), emissions control. Transmission Manual: Clutch operation, gearbox overhaul, shift linkage, transmission fluid specifications and replacement. Transmission Automatic: Automatic transmission operation, fluid replacement, control systems, torque converter service. Drivetrain: Driveshafts, constant velocity (CV) joints, differential, rear axle assembly, wheel bearings. Suspension: Front and rear suspension components (struts, shock absorbers, control arms, ball joints, bushings), alignment specifications, coil springs. Steering: Power steering system, steering rack, tie rods, steering column, steering angle sensor (if applicable). Brakes: Front and rear brake systems (discs, calipers, pads), hydraulic system, ABS (Anti-lock Braking System) components and troubleshooting, parking brake. Electrical System: Battery, alternator, starter motor, wiring diagrams for all circuits, fuses, relays, lighting systems, horn. Body And Chassis: Body panel repair, doors, hood, trunk, bumpers, interior trim, chassis structural components, rust prevention and repair. HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system diagnosis, refrigerant handling, compressor, evaporator, heater core. Interior: Seats, dashboard, instrument cluster, door panels, headliner, carpeting, seat belts, airbags (if equipped). Diagnostics: Troubleshooting charts, diagnostic trouble codes (DTCs), common fault symptoms and remedies. Procedures Included Routine Maintenance: Oil and filter changes, air filter replacement, spark plug replacement, coolant flush, brake fluid flush, drive belt inspection/replacement. Major Repairs: Engine rebuilds, transmission overhauls, suspension component replacement, brake caliper/rotor replacement, radiator replacement. Electrical Troubleshooting: Diagnosing electrical faults using wiring diagrams, testing components, tracing circuits. Fuel System Service: Fuel injector cleaning/replacement, fuel pump testing, fuel filter replacement, fuel pressure testing. Cooling System Service: Thermostat replacement, water pump replacement, radiator and hose inspection/replacement. Diagnostic Procedures: Step-by-step guides for diagnosing specific issues based on symptoms. Technical Depth Diagnostic Level: Advanced diagnostics, including sensor readings, ECU functions, and troubleshooting common electronic faults. Rebuild Scope: Comprehensive engine and transmission rebuild procedures, including torque specifications, clearances, and assembly sequences. Wiring Diagrams: Detailed, often color-coded, wiring schematics for all vehicle electrical systems. Special Tools: Identification and use of specialized BMW tools required for specific repair procedures. 📊 Manual Specifications File Format File Type: PDF (assumed) Searchability: Likely text-searchable (if properly created PDF) Print Quality Resolution: High-resolution images and diagrams (typical for professional manuals) Binding Type Binding: N/A (Digital format) Paper Type Paper: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Code: M20B25 Engine Type: Inline 6-cylinder, SOHC (Single Overhead Camshaft) Displacement: 2.5 Liters (2494 cc) Performance Horsepower: 168 hp @ 5800 rpm (approximate) Torque: 164 lb-ft @ 4300 rpm (approximate) Fuel System Fuel Delivery: Bosch Motronic M2.7 Fuel Injection Fuel Type: Premium Unleaded Gasoline (91+ Octane) Maintenance Timing Belt Interval: Every 30,000-60,000 miles or 3-5 years (critical maintenance item) 🔧 Transmission Standard Transmission Type: Getrag 260 5-speed Manual Transmission Optional Transmission Type: ZF 4HP22 4-speed Automatic Transmission Features Clutch Type: Hydraulically operated single dry plate clutch Fluid Specs Manual Transmission Fluid: BMW approved manual transmission fluid (e.g., ATF Dexron II or equivalent) Automatic Transmission Fluid: BMW ATF Dexron II or III (check specific VIN for exact requirement) 📐 Dimensions Exterior Wheelbase: 101.2 inches (2570 mm) Length: 170.5 inches (4330 mm) Width: 67.1 inches (1704 mm) Height: 54.7 inches (1390 mm) Weights Curb Weight: 2975 lbs (1350 kg) (approximate, manual transmission) Gross Vehicle Weight Rating: 4100 lbs (1860 kg) (approximate) 🛡️ Safety Features Ratings NHTSA Front Impact: Not rated for this era by modern standards Passive Features Seat Belts: 3-point inertia-reel seat belts with front pretensioners Airbags: Driver-side airbag standard for 1990 model year in US market. Body Structure: Reinforced safety cage, crumple zones front and rear. Active Features ABS: Anti-lock Braking System (ABS) standard on 325i models. 💡 Technology Features Infotainment Head Unit: Factory AM/FM Cassette player with optional CD changer. Speakers: Multiple speaker locations, often including door and rear deck speakers. Driver Assistance ABS: Standard Anti-lock Braking System (ABS) on all wheels. Connectivity Early Electronics: Basic onboard computer (check control system), electronic fuel injection and ignition control. 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000-7,500 miles or 6-12 months (synthetic oil recommended) Spark Plug Replacement: Every...