Positioning:
        
        
            The Audi 100 and 200 of the 1990 model year represented Audi's executive-class offerings, known for their advanced technology, comfortable interiors, and refined driving experience, particularly with the quattro all-wheel-drive system.
        
     
    
    
        
            Competitors:
        
        
            Competed against other luxury sedans and coupes of the era, such as the Mercedes-Benz W124 E-Class, BMW E32 7 Series, and various Japanese luxury marques.
        
     
    
    
        
            Design Philosophy:
        
        
            Emphasized aerodynamics, safety, and innovative engineering, with a focus on the quattro system providing superior traction and handling.
        
     
    
        
            Target Audience:
        
        
            Professionals and discerning car owners seeking a blend of performance, luxury, and all-weather capability.
        
     
 
    
    
    
        
            Engines:
        
        
            Covers all gasoline and diesel engine variants offered for the 1990 Audi 100/200, including 2.0L, 2.3L, 2.2L Turbo (UR-Quattro often associated with 200 model), and potential diesel variants.
        
     
    
        
            Transmissions:
        
        
            Manual and automatic transmission systems.
        
     
    
        
            Drivetrain:
        
        
            Front-wheel drive (FWD) and quattro all-wheel drive (AWD) systems.
        
     
    
        
            Systems:
        
        
            Engine mechanicals, fuel injection, ignition, cooling, lubrication, exhaust, transmission, drivetrain components, suspension, steering, brakes, electrical system (including wiring diagrams), HVAC, body and chassis, interior trim, and diagnostics.
        
     
    
    
        
            Estimated Pages:
        
        
            Likely exceeds 1000 pages based on the depth of coverage indicated.
        
     
    
    
        
            Type:
        
        
            Full Service Repair Manual
        
     
    
    
    
    
    
        
            Delivery:
        
        
            Instant Download
        
     
 
    
    
    
        
            Engine Mechanical:
        
        
            Detailed rebuild procedures for cylinder heads, engine blocks, pistons, crankshafts, camshafts, timing belts/chains, and related components. Includes torque specifications and clearances.
        
     
    
        
            Fuel System:
        
        
            Covers fuel injection systems (e.g., Bosch K-Jetronic, KE-Jetronic), fuel pumps, injectors, fuel pressure regulators, and diagnostic procedures for these components.
        
     
    
        
            Ignition System:
        
        
            Details on ignition timing, spark plugs, ignition coils, distributors (if applicable), and electronic control units (ECUs) related to ignition.
        
     
    
        
            Cooling System:
        
        
            Radiator, water pump, thermostat, cooling fans, coolant types, and troubleshooting for overheating issues.
        
     
    
        
            Lubrication System:
        
        
            Oil pump, oil filter, oil pan, oil types and capacities, and lubrication system diagnostics.
        
     
    
        
            Transmission Drivetrain:
        
        
            Repair and overhaul procedures for manual gearboxes, automatic transmissions, clutch systems, drive shafts, CV joints, differentials, and quattro system components.
        
     
    
        
            Suspension Steering:
        
        
            Front and rear suspension components (struts, shocks, control arms, bushings), power steering system (pump, rack and pinion), wheel alignment specifications.
        
     
    
        
            Brakes:
        
        
            Disc and drum brake systems, hydraulic components (master cylinder, calipers, wheel cylinders), brake fluid specifications, ABS (if equipped), and brake bleeding procedures.
        
     
    
        
            Electrical System:
        
        
            Comprehensive wiring diagrams for all vehicle systems, starter, alternator, battery, lighting, fuses, relays, and diagnostic procedures for electrical faults.
        
     
    
        
            HVAC:
        
        
            Heating, ventilation, and air conditioning system components, operation, and basic troubleshooting.
        
     
    
        
            Body Chassis:
        
        
            Body panel removal and installation, door mechanisms, glass replacement, chassis repair, and underbody components.
        
     
    
    
        
            Maintenance:
        
        
            Regular service intervals, oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, timing belt replacement, and general upkeep recommendations.
        
     
    
        
            Troubleshooting:
        
        
            Systematic diagnostic procedures for common problems, including engine performance issues, electrical faults, starting problems, and braking system anomalies.
        
     
    
        
            Repair Rebuild:
        
        
            Step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation of major vehicle systems.
        
     
    
        
            Diagnostics:
        
        
            Detailed guidance on diagnosing issues, including OBD-I (if applicable for the era), multimeter usage, pressure testing, and interpretation of diagnostic codes.
        
     
    
    
        
            Depth:
        
        
            Comprehensive, covering everything from routine maintenance to complete engine and transmission overhauls. Suitable for professional technicians and advanced DIY enthusiasts.
        
     
 
    
    
    
        
            Engine Variant 1:
        
        
            2.0L Inline-5 Cylinder (e.g., Audi 100 2.0E)
        
     
    
        
            Engine Variant 2:
        
        
            2.3L Inline-5 Cylinder (e.g., Audi 100 2.3E)
        
     
    
        
            Engine Variant 3:
        
        
            2.2L Inline-5 Cylinder Turbocharged (e.g., Audi 200 20V Turbo quattro)
        
     
    
    
        
            Horsepower Range:
        
        
            Approximately 115 hp (2.0L) to over 220 hp (2.2L Turbocharged).
        
     
    
        
            Torque Range:
        
        
            Varies by engine; Turbocharged models offered significantly higher torque figures.
        
     
    
    
        
            Injection Type:
        
        
            Bosch CIS (Continuous Injection System) or CIS-E (Electronic) fuel injection, and Motronic for turbocharged models.
        
     
    
        
            Fuel Type:
        
        
            Unleaded gasoline (Octane rating as per manufacturer's recommendation).
        
     
 
    
    
    
        
            Safety Features Era:
        
        
            While formal crash test ratings (like NHTSA's STAR system) were less standardized in 1990, Audi emphasized passive safety with features like safety-cell construction, energy-absorbing bumpers, and advanced seat belt systems. ABS was often an option.
        
     
    
    
        
            Braking System:
        
        
            Anti-lock Braking System (ABS) was available on most models as an option.
        
     
    
    
        
            Body Structure:
        
        
            Reinforced safety cage, crumple zones, side-impact protection beams.
        
     
    
        
            Restraints:
        
        
            Three-point seat belts with pre-tensioners (depending on market/spec), driver's side airbag (increasingly common in this era).
        
     
 
    
    
    
        
            Oil Change Interval:
        
        
            Typically every 7,500 to 10,000 miles (12,000 to 16,000 km) or annually, depending on driving conditions. Consult the specific manual for precise intervals.
        
     
    
        
            Timing Belt Replacement:
        
        
            Crucial service. For most 5-cylinder engines, replacement is typically recommended every 60,000 to 90,000 miles (96,000 to 144,000 km) or 5-7 years. Failure can cause severe engine damage.
        
     
    
    
        
            Engine Oil:
        
        
            API SF/SG or ACEA A1/A2, viscosity grade typically 5W-40 or 10W-40, though specific recommendations vary by engine and climate. Check manual for precise spec.
        
     
    
        
            Coolant:
        
        
            Ethylene glycol based antifreeze, typically a 50/50 mix with distilled water. Specific Audi G11 specification is common for this era.
        
     
    
        
            Brake Fluid:
        
        
            DOT 3 or DOT 4 brake fluid.
        
     
    
        
            Transmission Fluid Manual:
        
        
            API GL-4 or GL-5 gear oil, viscosity typically 75W-90 or 80W-90.
        
     
    
        
            Transmission Fluid Automatic:
        
        
            ATF Dexron III (or equivalent specified by Audi).
        
     
    
    
        
            Common Issues:
        
        
            Timing belt failure (if not replaced on schedule), vacuum hose deterioration leading to idle/performance issues, fuel distributor leaks (CIS systems), electrical gremlins, water pump failure, ABS sensor issues, and potential rust in certain areas (wheel arches, sills).
        
     
 
    
    
    
        
            Heritage:
        
        
            Audi, a member of the Volkswagen Group, has a long history of engineering innovation, particularly in quattro all-wheel drive technology and forward-thinking design.
        
     
    
    
        
            C3 Generation:
        
        
            The C3 (Type 44) platform, launched in 1982, was a significant departure for Audi, featuring advanced aerodynamics, galvanized bodies for corrosion resistance, and the introduction of the influential quattro all-wheel-drive system across a wider range of models.
        
     
    
        
            100 Vs 200:
        
        
            The 100 served as the mainstream executive model, while the 200 was positioned as the more luxurious and performance-oriented variant, often featuring turbocharging and higher trim levels.
        
     
    
    
        
            Production Years:
        
        
            The C3 generation was produced from 1982 to 1991. The 1990 model year falls within the later, refined years of this generation.