🏷️ Basic Information Identification Make: Audi Model: 100 Year: 1990 Codes Chassis Code: C4-4A 👋 Introduction Market Position Segment: Mid-size executive sedan and wagon, positioned as a premium European alternative. Competitive Analysis Competitors: BMW 5 Series, Mercedes-Benz E-Class, Volvo 740/940, Saab 9000. Key Features Design Philosophy: Sophisticated German engineering, Quattro all-wheel-drive availability, refined interior, and strong build quality. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service and repair for the 1990 Audi 100 (C4-4A). Model Variants Covered: All models and configurations of the 1990 Audi 100 (C4-4A) including sedan and Avant variants. Page Count Estimated Page Count: 1000+ Manual Type Type: Service and Repair Manual Purpose: Designed for professional technicians and experienced DIY enthusiasts. Content Focus: Technical service data, repair instructions, diagnostic procedures, specifications, and torque values. Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical (block, head, pistons, crankshaft, camshafts), fuel injection (CIS-E, KE-Jetronic), ignition, cooling, lubrication, exhaust, emissions control. Transmission Systems: Manual and automatic transmission overhaul, clutch, driveline, CV joints, differentials. Chassis And Suspension: Front and rear suspension, steering system, wheel bearings, shock absorbers, springs, bushings. Brake Systems: Hydraulic brake system, ABS (Anti-lock Braking System), brake pads, rotors, calipers, lines, master cylinder. Electrical Systems: Wiring diagrams, starter, alternator, battery, lighting, instruments, dashboard controls, fuses, relays, onboard diagnostics (OBD). Body And Interior: Body panels, doors, locks, hinges, glass, upholstery, climate control, HVAC, seat adjustments. Cooling System: Radiator, water pump, thermostat, heater core, fan operation, coolant flush procedures. Lubrication System: Oil pump, oil filter housing, oil pan, oil cooler (if equipped). Ignition System: Distributor, ignition coil, spark plug wires, spark plugs, ignition control module (ECU). Procedures Included Maintenance Procedures: Routine maintenance checks, oil changes, filter replacements, fluid level checks, belt inspections and replacement, spark plug replacement. Repair Procedures: Engine rebuilds, transmission repairs, suspension component replacement, brake service, electrical component diagnosis and repair, body panel repair. Troubleshooting Diagnostics: Systematic diagnostic procedures, fault code interpretation, symptom-based troubleshooting for all major vehicle systems. Bodywork Repair: Panel alignment, rust repair techniques, body trim removal and installation, window sealing. Diagnostic Charts: Detailed fault-finding charts correlating symptoms to potential causes and diagnostic steps. Technical Depth Depth: In-depth, dealership-level technical information covering complete overhauls, complex diagnostics, and specialized repair procedures. 📊 Manual Specifications File Format File Type: PDF Print Quality Resolution: High-resolution scans for clear text and legible diagrams. Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Code Common: Various, including 5-cylinder variants (e.g., 2.3L, 2.2L Turbo). Engine Displacement Example: 2.3 Liters (2309 cc) Engine Configuration Example: Inline 5-cylinder, SOHC or DOHC Performance Example Horsepower Example: ~130 hp @ 5500 rpm (2.3E) Torque Example: ~137 lb-ft @ 3000 rpm (2.3E) Fuel System Fuel Delivery: Bosch CIS-E (Continuous Injection System - Electronic) or KE-Jetronic fuel injection. Fuel Type: Unleaded Gasoline 🔧 Transmission Standard Transmission Type Standard: 5-speed Manual Transmission Optional Transmission Type Optional: ZF 4-speed Automatic Transmission (e.g., 4HP22) Features Drivetrain Options: Front-wheel drive (FWD) and permanent all-wheel drive (Quattro). 📐 Dimensions Exterior Sedan Example Length: Approx. 4770 mm (187.8 in) Width: Approx. 1777 mm (70.0 in) Height: Approx. 1420 mm (55.9 in) Wheelbase: Approx. 2700 mm (106.3 in) Weights Example Curb Weight: Approx. 1400-1500 kg (3086-3307 lbs) 🛡️ Safety Features Ratings Crash Test Data: While specific ratings for the 1990 model may be limited by modern standards, the C4 platform was known for robust construction. Active Features ABS: Optional Anti-lock Braking System (ABS) on many models. Passive Features Airbags: Driver's airbag standard on later models of this generation, passenger airbag optional. Seatbelts: Three-point inertia reel seatbelts with pre-tensioners. 💡 Technology Features Infotainment Audio System: Factory-installed Audi radio/cassette players, often with premium sound options (e.g., Bose). Climate Control: Manual or automatic climate control (Climatronic) with recirculate function. Driver Assistance Cruise Control: Optional cruise control system. Connectivity Connectivity Features: Limited by modern standards; primarily focused on vehicle mechanics and comfort features. 🔧 Maintenance Service Intervals Oil Change Interval Example: Every 10,000 km (6,000 miles) or 12 months, whichever comes first. Timing Belt Replacement Example: Every 80,000 - 100,000 km (50,000 - 60,000 miles) or 5 years. Fluid Specifications Engine Oil Type Example: API SG or higher, SAE 5W-40 or 10W-40 depending on climate. Coolant Type Example: G11 (Blue-Green) ethylene glycol coolant. Brake Fluid Type: DOT 3 or DOT 4. Automatic Transmission Fluid Example: G 052 162 A1 or equivalent ATF (e.g., Dexron II). Known Issues Common Electrical Problems: Corrosion in wiring harnesses, faulty door lock actuators, headlight switch failure. Common Engine Problems: Degradation of vacuum lines, distributor cap/rotor wear, idle control valve issues, oil leaks from seals. Common Suspension Problems: Worn ball joints, control arm bushings, and strut mounts. Common Fuel System Problems: Warm-up regulator (WUR) issues with CIS-E systems, fuel accumulator failure. 📚 Vehicle History Brand Heritage Audi...