🏷️ Basic Information Identification Make: BMW Model: 8 Series Model Variant: E31 Year: 1999 Codes Chassis Code: E31 Engine Code Primary: M62 (V8) Engine Code Secondary: S70/2 (V12 - limited availability) 👋 Introduction Market Position Segment: Luxury Grand Tourer Coupe / Convertible Target Audience: Discerning automotive enthusiasts seeking performance, luxury, and advanced engineering. Competitive Analysis Primary Competitors: Mercedes-Benz SL-Class, Porsche 911, Jaguar XJS, Aston Martin DB7 Key Features Design Philosophy: Aerodynamic, wedge-shaped profile, concealed headlamps, pillarless coupe design (on coupe models). Engineering Highlights: Advanced multi-link suspension, powerful V8 and V12 engines, extensive use of advanced materials for its era. 📋 Manual Details Coverage Areas Comprehensive Coverage: Yes Specific Models Covered: 840Ci, 850Ci, 850CSi (E31 chassis) Page Count Estimated Page Count: 1000+ Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Exhaust System, Drivetrain Chassis: Suspension (Front & Rear), Steering, Brakes (Hydraulic & ABS) Electrical: 12V Electrical System, Charging System, Starting System, Lighting, Instrumentation, On-Board Computer (OBC), Body Electronics, Power Accessories (Windows, Seats, Mirrors) Body And Interior: Body Panels, Doors, Hood, Trunk, Glass, Interior Trim, HVAC System Diagnostics: Diagnostic Trouble Codes (DTCs), Fault Finding, Troubleshooting Procedures Procedures Included Routine Maintenance: Oil Changes, Filter Replacements, Spark Plug Replacement, Fluid Checks & Replacements Major Repairs: Engine Rebuilds, Transmission Overhaul, Suspension Component Replacement, Brake System Overhaul Electrical Repairs: Wiring Harness Repair, Component Testing, Sensor Replacement, Module Diagnostics Troubleshooting Guidance: Step-by-step diagnostic flowcharts and symptom-based troubleshooting Technical Depth Depth Level: Comprehensive: Covers all aspects from basic maintenance to full engine and transmission rebuilds, including complex electrical diagnostics. Diagnostic Coverage: Advanced: Includes detailed procedures for using BMW's diagnostic tools (e.g., DIS). 📊 Manual Specifications File Format Digital Format: PDF Searchability: Text-searchable (OCR) Print Quality Digital Resolution: High-resolution scans for clear diagrams Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine 1 Variant: 4.4L V8 (M62B44) Engine 1 Configuration: 90-degree V8, DOHC, 4 valves per cylinder Engine 1 Displacement Liters: 4.4 Engine 1 Horsepower Hp: 282 Engine 1 Torque Lb Ft: 310 Secondary Engine Engine 2 Variant: 5.4L V12 (M73B54) Engine 2 Configuration: 60-degree V12, DOHC, 4 valves per cylinder Engine 2 Displacement Liters: 5.4 Engine 2 Horsepower Hp: 326 Engine 2 Torque Lb Ft: 361 Tertiary Engine Engine 3 Variant: 5.6L V12 (S70/2 - 850CSi) Engine 3 Configuration: 60-degree V12, DOHC, 4 valves per cylinder Engine 3 Displacement Liters: 5.6 Engine 3 Horsepower Hp: 375 Engine 3 Torque Lb Ft: 413 Fuel System Fuel Delivery: Multi-point Fuel Injection (Bosch Motronic) Fuel Type: Premium Unleaded Gasoline (91+ octane) 🔧 Transmission Standard Transmission Type 840Ci: 5-speed Automatic (Steptronic) Optional Transmission Type 850Ci: 6-speed Manual (limited availability) Transmission Type 850Csi: 6-speed Manual Features Drive Type: Rear-Wheel Drive (RWD) Differential: Limited Slip Differential (LSD) standard on 850CSi, optional on others Fluid Specifications Automatic Transmission Fluid: BMW ATF LT-3 (or equivalent Dexron III) Manual Transmission Fluid: BMW Synchromesh Fluid (or SAE 75W-90 GL-4) 📐 Dimensions Exterior Length In: 191.1 Width In: 71.7 Height In: 51.3 Wheelbase In: 106.5 Weights Curb Weight Lbs 840Ci: 3957 Curb Weight Lbs 850Ci: 4453 Curb Weight Lbs 850Csi: 4608 🛡️ Safety Features Ratings NHTSA Front Impact: Not explicitly rated for 1999, but BMW's safety engineering standards were high for the era. Active Features ABS: Standard Traction Control: ASC+T (Automatic Stability Control and Traction) standard on most models Stability Control: Part of ASC+T system Passive Features Airbags Front: Driver and Passenger Airbags standard Seatbelts: 3-point inertia-reel seatbelts with pretensioners Body Structure: Reinforced chassis and safety cage design. 💡 Technology Features Infotainment Head Unit: BMW Business RDS or Professional RDS radio with cassette player and CD changer capability. Display: Multi-function display (MFD) in dashboard for OBC, radio, and climate control. Driver Assistance Cruise Control: Standard electronic cruise control. Parking Sensors: Optional rear park distance control (PDC). Connectivity Telephone: Optional integrated car phone system. Navigation: Optional BMW Professional Navigation System (MK I/II). 🔧 Maintenance Service Intervals Oil Change Interval: Every 10,000-15,000 miles or 12-24 months (condition based service - CBS) Spark Plug Replacement V8: Approx. 60,000 miles Spark Plug Replacement V12: Approx. 50,000 miles Coolant Flush: Every 2-3 years Fluid Specifications Engine Oil V8: BMW Longlife-98 5W-40 Synthetic (or equivalent API SJ/CF, ACEA A3/B3) Engine Oil V12: BMW Longlife-98 5W-40 Synthetic (or equivalent API SJ/CF, ACEA A3/B3) Coolant: BMW Blue Antifreeze/Coolant (G48 ethylene glycol based) Brake Fluid: DOT 4 Known Issues Cooling System: Plastic coolant pipes can become brittle, water pump failure. Electrical Components: Window regulators, central locking system, headlight motors can fail. Age-related wiring degradation. Suspension: Front control arm bushings, rear self-leveling suspension (on some models) can wear. Idle Control V8: V8 engines can experience rough idle due to vacuum leaks or MAF sensor issues. Oil Leaks: Valve cover gaskets, oil pan...