🏷️ Basic Information Identification Make: Audi Model: 100 Generation Code: C4 Model Years Covered: 1991, 1992, 1993, 1994 👋 Introduction Market Position Market Position: The Audi 100 (C4) was positioned as a premium executive sedan and wagon, competing with models like the Mercedes-Benz E-Class and BMW 5 Series of the era, emphasizing comfort, refinement, and understated luxury. Competitive Analysis Competitive Analysis: Offered a strong blend of quattro all-wheel-drive capability, solid build quality, and sophisticated engineering, often outperforming rivals in all-weather traction and offering a more comfortable ride. Key Features Key Features: Pioneering use of galvanized steel for corrosion resistance, advanced quattro all-wheel-drive system, refined interior appointments, robust engine options. Manual Value Proposition Value Proposition: This is the definitive factory resource for anyone owning, maintaining, or repairing a 1991-1994 Audi 100. Its comprehensive coverage ensures that all aspects of the vehicle, from routine service to complex overhauls, are thoroughly documented, saving time and money on repairs. 📋 Manual Details Coverage Areas Coverage Scope: Complete factory service and repair Page Count Page Count: Hundreds Manual Type Manual Type: Service and Repair Manual Language Language: English Format Format: Digital (Instant Download) 📖 Manual Coverage Systems Covered Engine Mechanical: Full overhaul, diagnostics, timing belt replacement, piston and ring service, cylinder head repair, crankshaft and bearing service, oil pump, lubrication system. Engine Management: Engine Control Unit (ECU) diagnosis, fuel injection systems (CIS-E, Motronic), ignition systems, emissions control systems, diagnostic trouble codes (DTCs) interpretation. Transmission Manual: Clutch service, gearbox overhaul, shift linkage adjustment, transmission fluid specifications and replacement. Transmission Automatic: Transmission fluid change and inspection, torque converter service, valve body diagnosis, electronic transmission control diagnosis, overhaul procedures. Braking System: Brake pad and rotor replacement, brake caliper service, hydraulic system bleeding, ABS diagnosis and repair, parking brake adjustment. Suspension Steering: Strut and shock absorber replacement, control arm bushings, ball joint service, wheel bearing replacement, power steering system diagnosis and repair, alignment specifications. Electrical System: Wiring diagrams, charging system (alternator, battery), starting system (starter motor), lighting systems, instrument panel functions, comfort electronics, diagnostic procedures for electrical faults. HVAC System: Air conditioning system service, refrigerant charging, heater core replacement, climate control unit diagnosis, blower motor service. Fuel System: Fuel pump testing, fuel filter replacement, fuel injector service, fuel tank inspection and cleaning. Exhaust System: Exhaust manifold repair, catalytic converter replacement, muffler and pipe service, oxygen sensor replacement. Body Interior: Door panel removal, seat adjustment mechanisms, interior trim replacement, exterior trim and panel repair, body panel alignment. Safety Systems: Seat belt mechanisms, airbag system diagnosis (if equipped), restraint system components. Procedures Included Routine Maintenance: Oil and filter changes, fluid level checks, tire rotations, spark plug replacement, belt inspections and replacements. Troubleshooting: Diagnostic procedures for common and complex issues across all major vehicle systems, symptom-based troubleshooting guides. Major Repairs: Engine rebuilds, transmission overhauls, suspension component replacement, brake system overhauls, electrical component diagnosis and replacement. Component Removal Installation: Detailed step-by-step instructions for removing and installing virtually every component of the vehicle. Specifications Data: Torque specifications, clearances, fluid capacities, electrical resistance values, diagnostic parameters. Technical Depth Depth: Comprehensive factory-level detail suitable for professional technicians and advanced DIY enthusiasts. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High-resolution, suitable for professional printing of individual pages or the entire manual. Binding Type Binding Type Recommendation: Spiral-bound or three-ring binder recommended for workshop use due to page count and frequent reference. Paper Type Paper Type Recommendation: Durable, coated paper stock recommended for workshop environments to resist grease and dirt. Searchability Searchability: Likely contains searchable text for quick access to specific topics. ⚙️ Engine Specifications Primary Engine 1 Engine Code Gasoline V6 2.8L: AAN (12-valve), ABC (12-valve) Displacement Gasoline V6 2.8L: 2.8 Liters (2771 cc) Configuration Gasoline V6 2.8L: 60-degree V6, SOHC (Single Overhead Camshaft) Bore X Stroke Gasoline V6 2.8L: 82.5 mm x 91.3 mm Compression Ratio Gasoline V6 2.8L: 10.3:1 Horsepower Gasoline V6 2.8L: Approximately 172 hp @ 5500 rpm (may vary slightly by year/market) Torque Gasoline V6 2.8L: Approximately 200 lb-ft @ 3000 rpm (may vary slightly by year/market) Primary Engine 2 Engine Code Gasoline I5 2.5L: AAU (20-valve Turbo), AAE (20-valve) Displacement Gasoline I5 2.5L: 2.5 Liters (2474 cc) Configuration Gasoline I5 2.5L: Inline 5-cylinder, DOHC (Double Overhead Camshaft) Bore X Stroke Gasoline I5 2.5L: 81.0 mm x 95.5 mm Compression Ratio Gasoline I5 2.5L: 10.0:1 (Turbo), 10.3:1 (Non-turbo) Horsepower Gasoline I5 2.5L Turbo: Approximately 227 hp @ 5500 rpm (S6, Ur-S) Torque Gasoline I5 2.5L Turbo: Approximately 251 lb-ft @ 3000 rpm (S6, Ur-S) Fuel System Fuel Injection Type: Bosch CIS-E (Continuous Injection System - Electronic) and later Motronic. Fuel Type Fuel Type: Unleaded gasoline (91 octane or higher recommended). 🔧 Transmission Standard Transmission Standard Transmission Type: 5-speed manual transmission (Type 016). Optional Transmission Optional Transmission Type: 4-speed automatic transmission (Type 097). Features Drivetrain: Standard front-wheel drive (FWD)...