🏷️ Basic Information Identification Make: Audi Model: 90 Year: 1994 Codes Platform Code: B3/B4 👋 Introduction Market Position Positioning: Premium compact/mid-size executive sedan, known for its sophisticated design, Quattro all-wheel drive, and high-quality engineering. Targeted at discerning buyers seeking a balance of performance, luxury, and all-weather capability. Competitive Analysis Competitors: BMW 3 Series, Mercedes-Benz 190E, Lexus ES 250/300, Acura Legend Key Features Highlighted Features: Quattro AWD system, available V6 engines, upscale interior, solid build quality, distinctive Audi styling. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Maintenance, Diagnostics, Troubleshooting Page Count Estimated Page Count: Extensive (Digital format, equivalent to several hundred printed pages) Manual Type Type: Official Factory Service and Repair Manual Software Language Language: English Format Format: Online Software/Web-based Access 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical (2.6L V6, 2.8L V6), fuel system, ignition system, exhaust system, cooling system, lubrication system Drivetrain: Front-wheel drive (FWD), Quattro all-wheel drive (AWD), manual transmission, automatic transmission, clutch, driveshafts, differentials Chassis: Suspension (front and rear), steering system, brakes (hydraulic, ABS) Electrical: Wiring diagrams, lighting, instrumentation, charging system, starting system, engine control unit (ECU), body electricals, climate control, power accessories Body And Interior: Body panels, doors, windows, seats, HVAC system (heating, ventilation, air conditioning) Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, belt inspections and replacement Repair Procedures: Engine overhaul, transmission rebuild, brake caliper replacement, suspension component renewal, steering rack repair, starter motor replacement, alternator replacement Diagnostics: Troubleshooting guides for common symptoms, diagnostic trouble codes (DTCs), electrical system diagnostics, fuel system testing Technical Depth Depth: Comprehensive: from routine maintenance and adjustments to complete engine and transmission overhauls, including detailed electrical troubleshooting and component replacement procedures. 📊 Manual Specifications File Format Digital Format: Web-based access, compatible with standard web browsers on PC, laptop, smartphone, tablet. Print Quality Print Quality: N/A (Digital - ensures clarity and detail of diagrams and text) Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Code And Description: AAH (2.8L V6 SOHC, 172 hp @ 5500 rpm, 184 lb-ft @ 3000 rpm), ACE (2.6L V6 SOHC, 150 hp @ 5700 rpm, 157 lb-ft @ 3500 rpm) Performance Horsepower Range: 150-172 hp Torque Range: 157-184 lb-ft Fuel System Fuel Delivery: Multi-Point Fuel Injection (MPI) with Electronic Engine Control (EEC-IV or similar) Engine Management ECU Type: Bosch Motronic (specific variant depends on engine and market) Cooling System Coolant Capacity: Approx. 8.5 Liters (8.9 US Quarts) Lubrication System Oil Capacity: Approx. 4.5 Liters (4.8 US Quarts) with filter change Timing Timing Belt Replacement Interval: Typically 60,000 to 90,000 miles or 5-7 years (refer to manual for exact specification). 🔧 Transmission Standard Transmission Type: 5-speed Manual Transmission Optional Transmission Type: 4-speed Automatic Transmission (Tipronic optional on some later models, but less common on the '94 90) Features AWD System: Quattro permanent all-wheel drive (available on most models) Fluid Specifications Manual Transmission Fluid: API GL-4 or GL-5, SAE 75W-90 synthetic gear oil (e.g., Audi G 052 911 A1) Automatic Transmission Fluid: Dexron III or equivalent (e.g., Audi G 052 990 A2) 📐 Dimensions Exterior Wheelbase: Approx. 2610 mm (102.8 inches) Length: Approx. 4405 mm (173.4 inches) Width: Approx. 1700 mm (66.9 inches) Height: Approx. 1390 mm (54.7 inches) Weights Curb Weight Range: Approx. 1350-1450 kg (2976-3197 lbs) depending on FWD/Quattro and equipment Wheels And Tires Wheel Bolt Pattern: 5x112 Tire Sizes: Commonly 195/65R15, 205/55R16 🛡️ Safety Features Ratings NHTSA Ratings 1994: Specific ratings for 1994 models may not be readily available or standardized as modern crash tests. However, Audi of this era was known for solid construction. Active Features Braking System: Front: Ventilated discs; Rear: Solid discs. Optional Anti-lock Braking System (ABS) standard on many Quattro models. Passive Features Airbags: Driver's side airbag standard. Seatbelts: Front seatbelt pretensioners. 💡 Technology Features Infotainment Audio System: Factory AM/FM cassette player with optional CD changer. Basic speaker configurations. Driver Assistance ABS: Anti-lock Braking System (ABS) available, primarily on Quattro models. Connectivity Features: Limited by era. Primarily focused on vehicle operation rather than external connectivity. Central locking, power windows/mirrors on higher trims. Climate Control HVAC System: Manual climate control with optional automatic climate control. Heater core is a known potential failure point. 🔧 Maintenance Service Intervals Oil Change Interval: Typically 5,000-7,500 miles or 6 months, using synthetic or semi-synthetic oil. Brake Fluid Flush Interval: Every 2 years, regardless of mileage. Fluid Specifications Engine Oil Specification: API SG/SH or ACEA A2-96/A3-98, SAE 5W-40 or 10W-40 (refer to owner's manual for exact viscosity based on temperature). Coolant Specification: G12 or G12+ (Pink/Purple) ethylene glycol-based antifreeze mixed 50/50 with distilled water. Power Steering Fluid: Pentosin CHF 11S or equivalent hydraulic fluid. Known Issues Common Wear Items: Suspension bushings (control arms, sway bars), CV joints (especially on Quattro models), heater core (prone to leaks), ABS sensors, ignition components...