🏷️ Basic Information Identification Make: Audi Model: 100 Year: 1990 Codes Chassis Code: C3-44 👋 Introduction Market Position Segment: Executive Mid-size Sedan/Wagon Positioning: Luxury, performance, and advanced technology for its era Competitive Analysis Competitors: BMW 5 Series, Mercedes-Benz E-Class, Volvo 240/700 Series, Saab 9000 Key Features Design: Aerodynamic styling, distinctive Audi grille, Quattro AWD option Engineering: Front-wheel drive as standard, sophisticated independent suspension, focus on driver control Manual Value Proposition Value: Provides factory-level diagnostic and repair data, enabling accurate and efficient maintenance, crucial for preserving the vehicle's sophisticated systems. 📋 Manual Details Coverage Areas Models Covered: All Audi 100 (C3-44) models Repair Scope: A-Z (All repairs) Page Count Estimated Page Count: Extensive (Specific count not provided, but typical for full factory service manuals) Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: All engine types, diagnostics, repair, overhaul Transmission: Manual and Automatic transmission service, repair, overhaul Drivetrain: Front-wheel drive (FWD) and Quattro all-wheel drive (AWD) systems, differentials, drive shafts Suspension: Front and rear suspension components, geometry, repair Steering: Power steering system, steering rack, column Brakes: Hydraulic system, ABS (if equipped), discs, pads, lines, master cylinder, caliper overhaul Electrical: Complete wiring diagrams, diagnostics, ECU, sensors, actuators, lighting, charging system, starting system Fuel System: Fuel injection systems (K-Jetronic, KE-Jetronic), fuel pump, injectors, fuel pressure regulator Cooling System: Radiator, water pump, thermostat, hoses, fan operation Exhaust System: Exhaust manifold, catalytic converter, mufflers, piping Climate Control: Heating, ventilation, and air conditioning (HVAC) system components and service Bodywork: Body panel removal/installation, alignment, rust repair guidance Interior: Seat removal, dashboard components, trim panels Procedures Included Maintenance: Scheduled maintenance intervals, fluid changes, filter replacements, tune-ups Troubleshooting: Diagnostic procedures for common and uncommon faults, symptom-based troubleshooting guides Repair: Detailed step-by-step repair instructions for all major and minor components Overhaul: Complete engine and transmission overhaul procedures, including component specifications Diagnostics: Specific diagnostic codes (where applicable), measurement values, signal tracing Specifications: Torque values, clearances, fluid capacities, electrical specifications Technical Depth Depth: Comprehensive (Factory-level detail, suitable for professional technicians and advanced DIYers) 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable (if scanned professionally) Print Quality Quality: High (Typical for factory manuals, includes diagrams and illustrations) Binding Type Binding: N/A (Digital download) Paper Type Paper: N/A (Digital download) ⚙️ Engine Specifications Primary Engine Engine Code Variants: e.g., NG (2.3L I5), WC (2.2L I5 Turbo, Coupe/Quattro), NF (2.0L I4), PM (2.0L I4) Engine Displacement Displacement Options: 2.0L, 2.2L, 2.3L (Inline-4 and Inline-5, naturally aspirated and turbocharged) Performance Horsepower Range: Approx. 115 hp to 170 hp (depending on engine and turbocharging) Torque Range: Approx. 125 lb-ft to 177 lb-ft (depending on engine and turbocharging) Fuel System Injection Type: Bosch K-Jetronic (CIS) and KE-Jetronic (CIS-E) Fuel Type Fuel Recommendation: Unleaded gasoline (Octane rating appropriate for engine, e.g., 91 AKI or higher for turbo models) Engine Management ECM Type: Various digital engine control units (ECUs) depending on engine and year, often with diagnostic connectors 🔧 Transmission Standard Transmission Type: 5-speed Manual Transmission Optional Transmission Type: 4-speed Automatic Transmission (e.g., ZF 4HP-22) Features AWD System: Optional Torsen center differential Quattro all-wheel drive system Fluid Specifications Atf Type: Refer to manual for specific ATF (e.g., Dexron III or equivalent for automatic transmissions) Manual Trans Oil Spec: Refer to manual for specific gear oil (e.g., SAE 75W-90 GL-4/GL-5) 📐 Dimensions Exterior Body Styles: 4-door Sedan, 5-door Avant (Wagon) Weights Curb Weight Range: Approx. 2,900 - 3,500 lbs (1315 - 1588 kg), depending on configuration 🛡️ Safety Features Ratings Crash Testing: Limited official crash test data available for this era, but generally designed to meet European standards of the time. Passive Features Airbags: Driver-side airbag became available/standard later in the C3 generation, optional on some models. Seatbelts: 3-point inertia-reel seatbelts front and rear. Chassis Design: Unitized body construction with crumple zones. Active Features ABS: Anti-lock Braking System (ABS) was an optional feature on many models. 💡 Technology Features Infotainment Audio System: Factory premium sound systems available (e.g., Audi Concert), often with cassette player and analog tuning. Climate Control: Manual climate control standard; optional automatic climate control (Climatronic on later models, but less common in '90 C3). Driver Assistance Cruise Control: Optional cruise control system. Connectivity Diagnostics: On-board diagnostics (OBD) capabilities may be limited to basic fault codes via specific diagnostic connectors, not the comprehensive OBD-II standard. 🔧 Maintenance Service Intervals Oil Change: Typically every 5,000 - 7,500 miles (8,000 - 12,000 km) or 6-12 months, depending on driving conditions and oil type. Timing Belt: Crucial replacement interval for 5-cylinder engines (e.g., 60,000 - 90,000 miles or 5-7 years). Failure can cause catastrophic engine damage. Fluid Specifications Engine Oil Type: Refer to manual: Typically SAE 5W-30 or 5W-40 synthetic or semi-synthetic for optimal protection, or SAE 10W-40 for older specs/warmer climates. Check API classification. Coolant Type:...