🏷️ Basic Information Identification Make: Audi Model: 100 Quattro Year: 1990 Codes Chassis Code: 443 Platform: Audi Type 44 👋 Introduction Market Position Segment: Executive Sedan/Wagon with Advanced AWD Technology Competitive Analysis Competitors: BMW 5 Series, Mercedes-Benz E-Class, Volvo 740/760, Saab 9000 Key Features Distinguishing Features: Permanent All-Wheel Drive (Quattro), sophisticated European styling, comfortable interior, advanced safety features for its era. 📋 Manual Details Coverage Areas Covered Regions: North America, Europe (model variants may apply) Page Count Estimated Page Count: 1500+ Manual Type Type: Official Service & Repair Manual Software Language Language: English Format Format: Digital Software (likely PDF or similar searchable format) 📖 Manual Coverage Systems Covered Powertrain: Engine (2.3L 5-cylinder), Fuel System, Ignition System, Exhaust System, Cooling System Drivetrain: Quattro All-Wheel Drive System (Center Differential, Rear Differential, Transfer Case), Manual Transmission, Automatic Transmission Chassis: Suspension (Front & Rear), Steering System, Braking System (ABS), Wheels & Tires Electrical: Engine Control Unit (ECU), Lighting System, Instrumentation, Power Accessories, Audio System, Diagnostic Connectors Body: Body Panels, Doors, Windows, Seats, HVAC System, Body Electrical Procedures Included Maintenance: Scheduled Maintenance, Fluid Changes, Filter Replacements, Spark Plug Service, Belt Replacement Repair: Engine Overhaul, Transmission Repair, Suspension Component Replacement, Brake System Overhaul, Electrical Component Diagnosis & Repair Diagnostics: Troubleshooting Guides, Diagnostic Trouble Codes (DTCs) Explanation, Wiring Diagrams, Component Testing Troubleshooting: Detailed troubleshooting flowcharts for common and intermittent faults across all systems. Technical Depth Depth: Comprehensive (from basic maintenance to full rebuilds and advanced diagnostics) Specific Procedures: Engine component torque specifications, valve clearances, fuel pressure tests, transmission shift point adjustments, ABS system bleeding procedures. 📊 Manual Specifications File Format File Type: Likely Searchable PDF or Proprietary Software Executable Searchability: Likely fully searchable text content, allowing for quick access to specific information. Print Quality Quality: High-resolution diagrams and text, optimized for digital viewing Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) Completeness Coverage Scope: All factory-specified procedures, specifications, diagnostic information, and troubleshooting guides. ⚙️ Engine Specifications Primary Engine Engine Type: Inline 5-cylinder, naturally aspirated Engine Code: NG (for 2.3E) Displacement: 2309 cc Bore X Stroke: 76.4 mm x 107.0 mm Compression Ratio: 10.1:1 Performance Horsepower: 136 PS (134 bhp) @ 5600 RPM Torque: 205 Nm (151 lb-ft) @ 3500 RPM Fuel System Fuel Injection: Bosch KE-Jetronic (CIS-E) Fuel Injection Fuel Type: Unleaded Premium Gasoline (91+ RON / 87+ AKI) Cooling System Coolant Type: Audi/VW G11 (Blue or Green) or equivalent G12 (Pink) coolant mixture (50/50) 🔧 Transmission Standard Transmission Type: 5-Speed Manual Transmission Optional Transmission Type: 4-Speed Automatic Transmission (ZF 4HP22) Features AWD System: Permanent All-Wheel Drive (Quattro) with viscous coupling center differential and optional rear differential lock. Fluid Specs Manual Transmission Fluid: API GL-4 or GL-5, SAE 75W-90 or 80W-90 Automatic Transmission Fluid: Dexron III / Mercon or equivalent 📐 Dimensions Exterior Body Styles: 4-Door Sedan, 5-Door Avant (Wagon) Wheelbase: 2610 mm (102.8 in) Length: 4790 mm (188.6 in) Sedan / 4745 mm (186.8 in) Avant Width: 1770 mm (69.7 in) Height: 1420 mm (55.9 in) Sedan / 1450 mm (57.1 in) Avant Weights Curb Weight: Approx. 1500-1600 kg (3300-3530 lbs) depending on configuration Gross Vehicle Weight Rating: Approx. 2000-2100 kg (4400-4630 lbs) Cargo Trunk Volume: Approx. 560 liters (19.8 cu ft) Sedan / 650-1500 liters (22.9-53.0 cu ft) Avant (with rear seats folded) 🛡️ Safety Features Ratings Crash Test Data: Limited independent crash test data available for this specific model year; based on era-typical engineering. Active Features ABS: Standard Anti-lock Braking System (ABS) AWD: Quattro all-wheel drive system enhances traction and stability in various conditions. Passive Features Airbags: Driver's side airbag standard; Passenger airbag optional on some models. Seatbelts: Three-point inertia-reel seatbelts with front pre-tensioners. Chassis Design: Integrated safety cage, crumple zones, impact-absorbing steering column. 💡 Technology Features Infotainment Audio System: Factory fitted Audi Gamma cassette radio with optional CD changer. Climate Control: Manual or optional Automatic Climate Control (Climatronic) with air conditioning. Driver Assistance Cruise Control: Available as an option on most models. Connectivity Diagnostic Port: OBD-I (On-Board Diagnostics) port, typically located under the dashboard or engine bay. 🔧 Maintenance Service Intervals Oil Change Interval: Every 10,000-15,000 km (6,000-9,000 miles) or 12 months, whichever comes first, with synthetic oil. Timing Belt Interval: Every 80,000-120,000 km (50,000-75,000 miles) or 5-7 years, depending on oil condition and belt type. Spark Plug Replacement: Every 30,000-60,000 km (20,000-40,000 miles) depending on plug type (copper vs. platinum). Fluid Specifications Engine Oil Capacity: Approx. 4.5 Liters (4.8 US Quarts) with filter change (5W-40 or 10W-40 full synthetic recommended for optimal performance). Brake Fluid: DOT 4 (ISO 4925 Class 4) or DOT 3 Power Steering Fluid: G 002 000 (Pentosin CHF 11S or equivalent) Known Issues Common Problems: Fuel distributor issues (KE-Jetronic), electrical connector corrosion, cooling system leaks (especially hoses and radiators), worn suspension bushings, ABS sensor failures, catalytic converter failure. Diagnosis Tips: Check for vacuum leaks, verify fuel...