🏷️ Basic Information Identification Make: Audi Model: 80 / 90 Year: 1991 Codes Chassis Code: 8A / 8A2 👋 Introduction Market Position Target Audience: Audi owners, independent repair shops, and DIY enthusiasts seeking professional-grade repair information. Competitive Analysis Value Proposition: Provides dealership-level repair accuracy and detail in a convenient digital format, offering significant savings over professional labor costs. Key Features Accessibility: Single, easy-to-use PDF manual with searchable content and printable sections. Accuracy: Vehicle-specific, not generic, ensuring precise repair instructions. 📋 Manual Details Coverage Areas Model Variants Covered: All Audi 80 and 90 variants for 1991 (8A/8A2 chassis) Page Count Estimated Page Count: Extensive (specific count not provided, but described as complete A-Z) Manual Type Type: Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Comprehensive coverage including maintenance, repair, fuel system, emission control, intake, exhaust, cooling, lubrication, ignition, starting, and charging systems. Drivetrain: Detailed sections on automatic transmissions, manual transmissions, clutch, transfer cases, propeller shafts, drive shafts, differentials, axles, and suspension components. Brakes Steering Wheels: Includes brake control, parking brake, steering column, power steering, tire and wheel specifications. Body Chassis Electrical: Coverage extends to body exterior and interior, doors, hood, glass, mirrors, instrument panel, seats, electrical systems, and multiplex/CAN communication. Comfort Convenience: Includes air conditioning, supplementary restraint systems (SRS), seat belts, engine immobilizer, cruise control, wiper and washer systems, door locks, meter/audio/visual systems, and horn. Procedures Included Diagnostic Procedures: Step-by-step instructions for diagnosing issues across all vehicle systems. Repair Procedures: Detailed, vehicle-specific A-Z repair procedures for virtually every component. Maintenance Procedures: Comprehensive maintenance tasks and schedules. Wiring Schematics: Includes full wiring schematics for electrical systems. Technical Depth Depth: Factory-level detail, equivalent to dealership technician manuals; covers complete repair and servicing. 📊 Manual Specifications File Format Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible. Requirements: Adobe PDF Reader and WinZip (free online). Print Quality Printability: All pages are printable, allowing for enlarged images and selective printing. Binding Type Binding: Digital (PDF format), eliminating physical wear and tear. Paper Type Paper Type Equivalent: N/A (Digital format), but printable on any desired paper type. ⚙️ Engine Specifications Primary Engine Engine Options 1991 Audi 80 90: Likely includes 2.0L (5-cylinder) and 2.3L (5-cylinder) engines, and potentially a 2.6L V6 in later 90 models. Specific engine codes (e.g., KV, NG, 3B for Coupe Quattro) would be detailed within the manual. Performance Typical Horsepower Range: Approximately 110 hp (2.0L) to 130 hp (2.3L), with higher outputs for performance variants like the Audi 90 Quattro Sport. Fuel System Fuel Delivery: Fuel injection systems (e.g., Bosch KE-Jetronic or Motronic) are standard across the range. The manual will cover fuel pump, injectors, pressure regulators, and EFI control modules. 🔧 Transmission Standard Standard Transmission: Likely a 5-speed manual transmission was standard on many Audi 80 models. Optional Optional Transmission: A 4-speed automatic transmission was commonly available as an option. Features Drivetrain Options: Front-wheel drive (FWD) and Audi's legendary Quattro all-wheel drive (AWD) were available, with specific details for each system in the manual. 📐 Dimensions Exterior Body Styles: The 8A/8A2 chassis typically denotes the saloon (sedan) and coupe body styles. Station wagon (Avant) variants might also be covered if applicable to the specific documentation scope. Weights Curb Weight Range: Approximately 2600-3000 lbs (1180-1360 kg), varying with engine and drivetrain configuration (FWD vs. Quattro). 🛡️ Safety Features Passive Features Seat Belts: Front and rear seat belts, likely with pre-tensioners for front occupants. Manual covers adjustment and replacement. Supplementary Restraint System: Driver-side airbag was becoming more common in this era; the manual will detail its function, diagnosis, and replacement if equipped. 💡 Technology Features Infotainment Audio System: Stock stereos were typically AM/FM cassette players. Manual covers removal, installation, and basic wiring for audio components. Driver Assistance Cruise Control: Cruise control was an available option. The manual will detail its operation, diagnostics, and repair of the actuator and control module. Connectivity Multiplex Can Communication: The inclusion of 'Multiplex/Can Communication' in the coverage list suggests the manual may detail early forms of vehicle network communication or diagnostic data transfer, albeit simpler than modern CAN bus. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, depending on driving conditions. Manual will specify exact intervals based on model and engine. Timing Belt Interval: Crucial maintenance item for these engines. Intervals are generally around 60,000 miles (96,000 km) or 4-5 years. Manual will list the exact interval and torque specifications for replacement. Fluid Specifications Engine Oil Type: Likely requires synthetic or semi-synthetic 5W-40 or 10W-40, depending on climate and engine. Manual will provide exact VW/Audi specifications (e.g., VW 500.00). Coolant Type: G11 (blue) or G12 (pink/red) antifreeze concentrate mixed with distilled water. Manual will specify the correct type and mixture ratio. Transmission Fluid Type: For automatic transmissions, likely a Dexron...