The Audi 100, specifically the Fourth Generation (C4) model produced in 1994, represents Audi's mid-size luxury sedan and avant (wagon) offerings. Known for its refined engineering, comfortable ride, and spacious interiors, the C4 was a direct competitor to established European luxury marques. Key features include the availability of standard Quattro all-wheel drive, sophisticated V6 engines such as the 2.8L AAF and potentially the 2.6L ABC, and in some variants, a turbocharged 2.2L engine. This generation of the Audi 100 emphasized premium build quality and a smooth driving experience, solidifying Audi's position in the luxury automotive market. This workshop service and repair manual provides comprehensive guidance for the Audi 100 (C4) model year 1994. It covers essential maintenance procedures, routine and major repairs, and detailed troubleshooting for all major vehicle systems. Included are in-depth sections on engine mechanicals and performance, transmission systems (both manual and automatic), brakes, suspension, steering, and the complete electrical system, along with HVAC and bodywork. This manual serves as an indispensable resource for owners and technicians seeking to maintain, diagnose, and repair their Audi 100, ensuring optimal performance and longevity. 🏷️ Basic Information Identification Make: Audi Model: 100 Model Generation: Fourth Generation (C4) Model Years Covered: 1994 Codes Chassis Code: C4 👋 Introduction Market Position Positioning: The Audi 100 (C4) represented Audi's mid-size luxury offering, positioned against competitors like the BMW 5 Series and Mercedes-Benz E-Class. It emphasized comfort, refined engineering, and a premium interior. Competitive Analysis Competitors: BMW 5 Series (E34), Mercedes-Benz E-Class (W124), Volvo 960, Saab 9000. Key Features Vehicle Features: Standard Quattro all-wheel drive (on many models), refined V6 engines, spacious and well-appointed interior, comfortable ride quality, advanced (for its time) safety features. Manual Value Proposition Value: Provides DIY enthusiasts and independent repair shops with the necessary technical data to service, maintain, and repair the Audi 100 C4, saving on dealership costs and ensuring proper upkeep. 📋 Manual Details Coverage Areas Primary Coverage: North American Market (implied by common sales focus, but manual itself may be international) Engine Variants Covered: Likely covers 2.8L V6 (AAF, ABC engine codes), and potentially 2.6L V6 (ABC engine code) if offered in specific 1994 markets. Turbocharged 2.2L 20V (RR engine code) from the S4 variant might also be included. Body Styles Covered: Sedan (4-door), Avant (Wagon) Page Count Estimated Page Count: 500-1000+ (typical for comprehensive workshop manuals) Manual Type Type: Workshop Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine overhaul, cylinder head, valve train, pistons, crankshaft, connecting rods, lubrication system, cooling system, timing belt/chain. Engine Performance: Fuel injection system, ignition system, exhaust system, emissions control. Transmission Manual: Manual gearbox repair, clutch system, driveline components. Transmission Automatic: Automatic transmission repair and overhaul (likely ZF or Audi's own design), torque converter, transmission control. Brakes: Brake system diagnosis, repair, components (calipers, rotors, master cylinder, ABS). Suspension: Front and rear suspension components, shock absorbers, springs, bushings, wheel alignment. Steering: Power steering system, steering rack, tie rods. Electrical System: Wiring diagrams, charging system (alternator, battery), starting system, lighting, instruments, gauges, power windows, mirrors, central locking. HVAC: Heating, ventilation, and air conditioning system diagnosis and repair. Body And Interior: Body panel removal/installation, interior trim, door mechanisms, seat adjustments, glass replacement. Diagnostics: Troubleshooting charts, diagnostic codes, OBD-I information (if applicable). Procedures Included Preventative Maintenance: Oil changes, filter replacements, spark plug replacement, fluid checks, belt inspections. Routine Repairs: Brake pad replacement, exhaust system repair, suspension component replacement. Major Repairs: Engine rebuilds, transmission overhauls, cylinder head gasket replacement. Troubleshooting: Systematic diagnosis of common and uncommon faults. Diagnostics: Guidance on using diagnostic tools and interpreting fault codes. Wiring Diagrams: Detailed electrical schematics for all vehicle systems. Technical Depth Depth: Comprehensive: Covers everything from basic maintenance to complete engine and transmission rebuilds, including detailed electrical schematics and diagnostic procedures. 📊 Manual Specifications File Format File Type: PDF Searchable Text: Likely searchable if the PDF was created from a well-scanned source with OCR, but not guaranteed without explicit confirmation. Print Quality Quality: Dependent on source scan quality. Assumed to be clear and legible for service purposes. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: AAF (2.8L V6 12V) Engine Type: Naturally Aspirated V6 Displacement: 2.8 liters (2771 cc) Bore X Stroke: 82.5 mm x 91.3 mm Compression Ratio: 10.3:1 Horsepower: 172 hp @ 5500 rpm (approx.) Torque: 184 lb-ft @ 3000 rpm (approx.) Performance Engine Codes Other: ABC (2.6L V6 12V), RR (2.2L 20V Turbocharged - S4 model) Fuel System Injection Type: Multi-point Fuel Injection (MPI) - Bosch Motronic Fuel Type: Unleaded Gasoline (91 Octane or higher recommended) Timing System Timing Belt: Yes, belt driven. Replacement interval typically 60,000-90,000 miles or 5-7 years. 🔧 Transmission Standard Transmission Type: 5-speed Manual Transmission (e.g., KXS, FKA) Optional Transmission Type: 4-speed Automatic...