🏷️ Basic Information Identification Make: Audi Model: 100 (C4) Model Generation: C4 Model Year Range: 1991-1994 Codes Chassis Code: C4 Engine Code Variant: 5-cylinder, Fuel Injection, 4-Valve Turbocharged (specific codes may vary) 👋 Introduction Market Position Market Segment: Premium Executive Sedan/Wagon (Audi 100 C4) Competitive Analysis Key Competitors: BMW 5 Series (E34), Mercedes-Benz E-Class (W124), Volvo 900 Series Key Features Vehicle Attributes: Known for its quattro all-wheel-drive system, comfortable ride, solid build quality, and refined interiors. Manual Value Proposition: Essential for owners and independent mechanics seeking detailed, authoritative repair and maintenance information. 📋 Manual Details Coverage Areas Coverage Focus: Mechanical Workshop Service and Repair Page Count Estimated Page Count: Varies by edition, typically 800+ pages for a comprehensive workshop manual Manual Type Manual Type: Workshop Service Repair Manual Language Language: English (assumed, standard for international manuals) Format Format: Digital (likely PDF, printable) 📖 Manual Coverage Systems Covered Engine Mechanical: Yes (rebuild, timing, valves, pistons, crankshaft, lubrication, cooling) Engine Fuel System: Yes (Fuel Injection system, components, troubleshooting, pressure testing) Engine Ignition System: Yes (coil packs, sensors, timing control) Turbocharger System: Yes (turbocharger operation, wastegate, intercooler, plumbing, diagnosis) Transmission Manual: Yes (repair, overhaul, clutch, shifting mechanisms) Transmission Automatic: Yes (repair, overhaul, hydraulic systems, control modules, if applicable to this engine variant) Drivetrain And Axles: Yes (CV joints, driveshafts, differentials) Suspension System: Yes (struts, shocks, bushings, control arms, alignment specifications) Steering System: Yes (power steering pump, rack and pinion, tie rods) Brake System: Yes (hydraulic components, ABS, disc/drum specifications, bleeding procedures) Electrical System: Yes (wiring diagrams, component locations, fuses, relays, battery, charging system) Body And Chassis: Yes (body panels, doors, windows, bumpers, frame structure) HVAC System: Yes (climate control, A/C, heating, ventilation components) Interior Trim: Yes (seats, dashboard, door panels, removal and installation) Lighting System: Yes (headlights, taillights, interior lights, bulb types) Diagnostic Troubleshooting: Yes (step-by-step diagnostic procedures, fault codes interpretation for applicable systems) Procedures Included Routine Maintenance: Yes (oil changes, filter replacements, spark plugs, fluid checks) Component Replacement: Yes (detailed instructions for replacing major and minor components) Engine Rebuilding: Yes (major overhaul procedures, torque specifications, clearances) Transmission Rebuilding: Yes (if applicable to the covered transmission types) Electrical Troubleshooting: Yes (using wiring diagrams, testing components) Suspension And Steering Repair: Yes (alignment, component replacement) Brake System Service: Yes (pad/rotor replacement, caliper service, bleeding) Turbocharger Diagnosis And Repair: Yes (specific to the 4-valve turbo engine) Technical Depth Depth Level: Comprehensive Workshop Level Diagnostic Capabilities: Advanced diagnostics, including component testing and troubleshooting charts Repair Detail: Detailed step-by-step repair instructions with diagrams and illustrations Specifications And Tolerances: Inclusion of all critical torque values, clearances, and fluid specifications 📊 Manual Specifications File Format File Format: PDF (Portable Document Format) Searchability: Searchable text for quick information retrieval Print Quality Printability: Printable pages for convenient in-garage use Illustrations: Includes diagrams, line drawings, and photographic illustrations Binding Type Binding Type: N/A (for digital format) Paper Type Paper Type: N/A (for digital format) ⚙️ Engine Specifications Primary Engine Engine Configuration: Inline 5-cylinder (I5) Valve Train: Dual Overhead Camshafts (DOHC), 4 Valves per Cylinder Aspiration: Turbocharged Performance Displacement: Typically 2.2 Liters (2226 cc) for this configuration Horsepower Range: Approx. 200-230 hp (depending on specific turbo and tuning, e.g., 20V Turbo variants) Torque Range: Approx. 250-280 lb-ft (depending on specific turbo and tuning) Fuel System Fuel Delivery: Electronic Fuel Injection (EFI), typically Bosch Motronic or similar Fuel Type: Premium Unleaded Gasoline (91+ Octane) Engine Management ECU Type: Engine Control Unit (ECU) managing fuel, ignition, and turbo boost 🔧 Transmission Standard Standard Transmission: 5-Speed Manual Transmission Optional Optional Transmission: 4-Speed Automatic Transmission (Tiptronic may be available on later models/variants) Features Drivetrain Options: Quattro All-Wheel Drive (standard on most performance variants, optional on some) Fluid Specifications Manual Transmission Fluid: GL-4 or GL-5 gear oil (specific viscosity e.g., 75W-90, refer to manual for exact spec) Automatic Transmission Fluid: G 052 162 A1 or equivalent ATF (specific to ZF or Audi gearbox, consult manual) 📐 Dimensions Exterior Body Styles: Sedan, Avant (Wagon) Length: Approx. 4807 mm (Sedan), 4787 mm (Avant) Width: Approx. 1778 mm Height: Approx. 1420 mm (Sedan), 1450 mm (Avant) Weights Curb Weight: Approx. 1500-1650 kg (depending on configuration and options) 🛡️ Safety Features Ratings Crash Test Ratings: Early 1990s safety standards; specific ratings vary by region and testing body. Active Features ABS: Standard Anti-lock Braking System (ABS) on most variants AWD: Optional/Standard quattro All-Wheel Drive for enhanced traction and stability Passive Features Airbags: Driver's side airbag standard; passenger airbag optional or standard on later models. Seatbelts: Front and rear seatbelts, pre-tensioners on front belts 💡 Technology Features Infotainment Audio System: Factory radio/cassette player with optional CD player, premium sound system options (e.g., Bose) Climate Control: Manual or automatic climate control (optional) Driver Assistance Cruise Control: Standard or optional cruise control system Connectivity Original Connectivity: Limited by era; typically focused on vehicle systems rather than external...