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Basic Information
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Identification
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Make:
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Audi
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Model:
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100
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Model Generation:
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Third Generation (C3)
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Model Years Covered:
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1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
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Codes
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Chassis Code:
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C3
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Engine Codes Common:
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WC, WX, RT, PS, RU, KG, MC, HP, NP, 3B (for 200/quattro models which may overlap in this generation's technical service information)
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Introduction
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Market Position
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Segment:
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Executive Car / Large Family Car
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Target Audience:
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Owners seeking to perform their own maintenance and repairs, independent repair shops, automotive enthusiasts.
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Competitive Analysis
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Competitors:
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BMW 5 Series (E28), Mercedes-Benz W124, Volvo 240/740, Saab 9000, Ford Scorpio.
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Key Features
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Design:
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Aerodynamic 'biodynamic' design penned by Hartmut Warkuß, known for its low drag coefficient. Available in sedan and avant (wagon) body styles.
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Technology:
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Pioneering use of galvanized steel bodywork for corrosion resistance, advanced quattro all-wheel-drive system, and innovative Procon-ten safety system (early form of pre-tensioned seatbelts and airbag precursor).
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Reputation:
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Known for build quality, comfort, and advanced technology for its era, especially with the quattro drivetrain.
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Manual Coverage
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Systems Covered
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Powertrain:
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Engine overhaul, fuel injection systems (K-Jetronic, KE-Jetronic, CIS-E), ignition systems, exhaust systems, engine cooling systems, lubrication systems.
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Drivetrain:
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Manual and automatic transmissions (e.g., 016, 095, 099), front-wheel drive (FWD), quattro all-wheel drive (AWD) system components, drive shafts, CV joints, differentials.
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Chassis:
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Front and rear suspension (McPherson struts, independent rear suspension), steering systems (power steering), brake systems (disc and drum, ABS if applicable to specific models), wheel bearings.
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Electrical:
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Complete wiring diagrams, lighting systems, starter motor, alternator, battery, instrument cluster, power windows, central locking, climate control electronics.
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Bodywork:
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Body panel repair and replacement, door mechanisms, glass replacement, interior trim removal and installation, sealing and weatherstripping.
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Procedures Included
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Maintenance:
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Routine maintenance checks, oil and filter changes, coolant flushes, spark plug replacement, belt tensioning and replacement, brake pad inspection.
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Diagnostics:
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Troubleshooting guides for common drivability issues, electrical faults, starting problems, and performance degradation. Includes diagnostic procedures for fuel injection and ignition systems.
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Repair And Rebuild:
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Detailed step-by-step instructions for engine rebuilds, transmission overhauls, brake caliper rebuilding, suspension component replacement, and electrical component repair.
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Adjustments:
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Valve lash adjustment (if applicable), ignition timing adjustments, idle speed control, clutch adjustment, brake system bleeding.
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Technical Depth
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Depth:
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Comprehensive coverage from basic maintenance and fluid changes to complex engine and transmission rebuilds, including diagnostic procedures and detailed torque specifications.
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Engine Specifications
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Primary Engine
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Engine Type:
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Inline-5 Cylinder, Naturally Aspirated and Turbocharged
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Displacement Range:
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2.0L to 2.3L (2144cc for many common variants)
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Performance
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Horsepower Range:
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90 hp (100) to 165 hp (100 CS quattro, 200 turbo)
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Torque Range:
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148 Nm to 245 Nm (approximate)
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Fuel System
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Fuel Delivery:
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Bosch K-Jetronic, KE-Jetronic, CIS-E (CIS-Electronic) Fuel Injection Systems, some models with Carburetors in early markets.
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Maintenance
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Timing Belt Replacement Interval:
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Typically every 60,000 to 90,000 miles (96,000 to 145,000 km) or 4-5 years, depending on specific engine and climate. Consult manual for exact interval.
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Technical Detail
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Engine Block Material:
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Cast Iron
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Cylinder Head Material:
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Aluminum Alloy
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Transmission
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Standard
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Transmission Type Early:
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5-Speed Manual Transmission
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Optional
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Transmission Type Late:
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3-Speed and 4-Speed Automatic Transmissions (e.g., ZF 4HP22)
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Features
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Quattro AWD:
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Center viscous coupling differential and rear differential in quattro models.
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Fluid Specifications
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Manual Transmission Fluid:
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API GL-4, SAE 75W-90 or 80W-90 gear oil. Consult manual for specific fill quantities.
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Automatic Transmission Fluid:
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Dexron III / Mercon equivalent (or specified Audi fluid). Consult manual for specific fill quantities.
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Maintenance
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Service Intervals
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Oil Change Interval:
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Typically every 10,000 km or 6 months for conventional oil. Synthetic oil may extend this interval. Always refer to the specific model year and engine recommendations.
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Air Filter Replacement:
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Every 30,000 km or annually, or more frequently in dusty conditions.
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Fluid Specifications
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Engine Oil Type:
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API SG/SH, ACEA A2/A3. Viscosity typically 10W-40 or 5W-40 (check manual for specific engine requirements).
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Engine Oil Capacity:
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Approximately 4.5 - 5.0 liters for most 5-cylinder engines (including filter). Consult manual.
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Coolant Type:
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Ethylene glycol based antifreeze (e.g., G11). Diluted 50/50 with distilled water.
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Known Issues
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Fuel System Durability:
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K-Jetronic/KE-Jetronic systems can be sensitive to dirt and fuel quality, potentially leading to uneven running or starting issues. Rebuild kits for fuel distributors and cold start valves are available.
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Electrical Gremlins:
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Older wiring harnesses, especially in the engine bay and door jambs, can degrade, leading to intermittent electrical faults. Common areas include sensor wiring and door lock actuators.
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Suspension Wear:
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Wear in bushings, ball joints, and tie rod ends is common due to age and mileage, leading to steering looseness or knocking sounds.
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Climate Control:
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HVAC blower motor resistors, vacuum actuators for blend doors, and refrigerant leaks in the A/C system are common failure points.
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Parts Availability
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Parts Status:
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Many common wear items are still available from aftermarket suppliers. Specialized parts or trim pieces may require sourcing from specialized Audi parts dealers or salvage yards.
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