🏷️ Basic Information Identification Make: Audi Model: 90 Year: 1990 Codes Chassis Code: Typ 8A Platform: B3 👋 Introduction Market Position Segment: Compact Executive Sedan/Coupe Target Audience: Affluent buyers seeking a sporty, well-engineered German automobile Competitive Analysis Key Competitors: BMW 3 Series, Mercedes-Benz 190E, Ford Sierra XR4i, Saab 900 Key Features Design: Aerodynamic styling, galvanized body shell, distinctive Audi grille Drivetrain: Available quattro all-wheel drive system, renowned for its traction and handling Powertrain: Smooth and torquey 5-cylinder inline engines Interior: Driver-focused cockpit, quality materials, ergonomic design 📋 Manual Details Coverage Areas Primary Focus: Comprehensive Repair and Maintenance Included Systems: Engine, Drivetrain, Suspension, Steering, Brakes, Electrical, HVAC, Body Page Count Estimated Pages: 1200+ Manual Type Type: Factory Service Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical (2.3L 5-cylinder, 2.0L 4-cylinder variants), fuel injection systems (KE-Jetronic, Digifant), ignition systems, exhaust systems, manual and automatic transmissions, all-wheel drive system (quattro) Chassis: Front and rear suspension components, steering system (power steering), brake system (ABS diagnosis and repair), wheel bearings, hubs Electrical: Complete wiring diagrams, lighting systems, instrument cluster, starter, alternator, battery, ECU diagnosis, fuse/relay identification and testing, power windows, mirrors, central locking Comfort And Body: HVAC system operation and repair, interior trim removal, door panel access, body panel alignment, bumper repair, seal replacement Procedures Included Diagnostics: Troubleshooting flowcharts, fault code interpretation (where applicable), diagnostic connector location and usage Maintenance: Scheduled maintenance intervals, oil changes, filter replacements, spark plug replacement, belt tensioning, fluid checks and top-offs Repair Rebuild: Component removal and installation, engine internal component overhaul (pistons, rings, bearings), cylinder head service, transmission overhaul, brake caliper rebuild, suspension bushing replacement Specifications: Torque specifications for all fasteners, clearance measurements, diagnostic data ranges Technical Depth Depth: Expert Level - Suitable for professional technicians and advanced DIY enthusiasts 📊 Manual Specifications File Format Digital Format: PDF Searchability: Full text searchable Printability: Printable pages Print Quality Image Resolution: High-resolution for clear diagrams and photos Binding Type Binding: N/A (Digital) Paper Type Paper Quality: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Code Common: WX (2.3L 5-cylinder) Displacement 2 3: 2309 cc Configuration 2 3: Inline 5-cylinder, DOHC Bore X Stroke 2 3: 82.5 mm x 92.8 mm Compression Ratio 2 3: 10.3:1 Power Hp 2 3: 137 hp @ 5800 rpm Torque Lb Ft 2 3: 155 lb-ft @ 3500 rpm Optional Engine Engine Code Common Optional: RT (2.0L 4-cylinder) Displacement 2 0: 1996 cc Configuration 2 0: Inline 4-cylinder, SOHC Power Hp 2 0: 115 hp @ 5400 rpm Torque Lb Ft 2 0: 129 lb-ft @ 3200 rpm Fuel System Fuel Injection Type: Bosch KE-Jetronic (5-cylinder), Digifant (some 4-cylinders) Fuel Type: Unleaded gasoline (91 octane or higher recommended) 🔧 Transmission Standard Type: 5-speed Manual Optional Type: 4-speed Automatic (ZF 4HP22) Features Drivetrain Options: Front-Wheel Drive (FWD), quattro All-Wheel Drive (AWD) Transmission Fluid Spec Manual: GL-4, SAE 75W-90 Transmission Fluid Spec Auto: ATF Dexron II 📐 Dimensions Exterior Length: 4340 mm (170.9 in) Width: 1700 mm (66.9 in) Height: 1390 mm (54.7 in) Wheelbase: 2610 mm (102.8 in) Weights Curb Weight FWD: Approx. 1260 kg (2778 lbs) Curb Weight Quattro: Approx. 1330 kg (2932 lbs) 🛡️ Safety Features Ratings NHTSA Frontal Impact: Not explicitly rated by NHTSA for this specific model year, but generally considered robust for its era. Active Features ABS: Anti-lock Braking System (ABS) optional on some models, standard on higher trims Traction Control: Not typically available on this model year Passive Features Airbags: Driver airbag standard, passenger airbag optional or not available depending on market and trim Seatbelts: 3-point inertia-reel front seatbelts, 3-point rear seatbelts Body Construction: Unitary construction with galvanized steel body for corrosion resistance 💡 Technology Features Infotainment Audio System: Factory AM/FM/Cassette stereo, often with cassette changer capability. Aftermarket head units are common upgrades. Climate Control: Manual climate control with A/C and heater. Automatic climate control was an option on some higher-trim models. Driver Assistance ABS: Available, but not universally standard. Cruise Control: Optional on most models. Connectivity Connectivity Features: Limited to factory radio and power accessories. No integrated Bluetooth or USB. 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000-7,500 miles or 6-12 months, whichever comes first. Air Filter Replacement: Every 15,000-30,000 miles or as needed based on operating conditions. Spark Plug Replacement: Every 30,000 miles (standard plugs), 60,000 miles (if equipped with platinum plugs). Timing Belt Replacement: Every 60,000 miles or 5 years (critical for 5-cylinder engines to prevent valve damage). Fluid Specifications Engine Oil Spec: SAE 5W-40 Synthetic or 10W-40 Synthetic/Semi-synthetic is generally recommended for optimal performance and protection, especially in colder climates. Refer to owner's manual for specific grade. Coolant Spec: G11 (Blue) or equivalent ethylene glycol-based antifreeze, mixed 50/50 with distilled water. Brake Fluid Spec: DOT 3 or DOT 4 Known Issues Common Problems Electrical: Degradation of wiring insulation (especially...