🏷️ Basic Information Identification Make: Audi Model: 90 Model Code: Type 85 / Type 8A (B3 chassis) Years Covered: 1988-1992 Market Segment: Compact Executive Sedan/Coupe 👋 Introduction Market Position Segment: Premium compact executive segment, competing with BMW 3 Series, Mercedes-Benz 190E. Competitive Analysis Key Competitors: BMW E30 3 Series, Mercedes-Benz W201 190E, Acura Legend, Lexus ES250. Key Features Design Philosophy: German engineering, sophisticated styling, front-wheel drive (standard) and quattro all-wheel drive options, inline-five engines. Unique Selling Points Powertrain: Renowned Audi inline-five cylinder engines known for smooth power delivery and unique sound. 📋 Manual Details Coverage Areas Primary Coverage: Maintenance and Repair Procedures Secondary Coverage: Specifications, Technical Features, Troubleshooting, Electrical Systems, Fuel Systems, Powertrain, Drivetrain, Suspension, Maintenance, Index, Appendix Page Count Estimated Page Count: Varies based on specific model year and engine; typically 500+ pages for comprehensive factory manuals. Manual Type Type: Service Repair Factory Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Engine mechanical, engine management, cooling system, lubrication system, emission control system Fuel System: Fuel injection (CIS-E/KE-Jetronic), fuel pump, fuel filter, fuel lines, fuel tank Electrical System: Wiring diagrams, battery, charging system, ignition system, lighting, instruments, accessories, starter motor, ECU diagnostics Transmission: Manual and Automatic transmission repair, clutch, driveline components (CV joints, driveshafts) Suspension Steering: Front and rear suspension, steering gear, power steering system, wheel alignment Brakes: Hydraulic system, disc brakes (front and rear), anti-lock braking system (ABS) if equipped, parking brake Body Chassis: Body panel repair, interior trim, doors, windows, HVAC (Heating, Ventilation, and Air Conditioning), chassis components Procedures Included Maintenance: Scheduled maintenance (oil changes, filter replacements, tune-ups), fluid checks and replacements, belt inspections and replacements Troubleshooting: Diagnostic procedures for common problems, fault code interpretation (if applicable), electrical system troubleshooting Repair Rebuild: Detailed disassembly, inspection, repair, and reassembly procedures for major components and systems Technical Adjustments: Valve adjustments, idle speed settings, ignition timing adjustments Technical Depth Depth: Comprehensive, covering basic maintenance to major component overhauls and advanced diagnostics 📊 Manual Specifications File Format Readability: High clarity, zoomable sections for detailed views Searchability: Likely searchable text within the PDF for quick information retrieval Print Quality Digital Quality: Electronic (PDF), allowing for clear digital viewing Binding Type Format Type: Digital Download (PDF) Paper Type Physical Equivalent Description: Digital equivalent of a factory-issued bound manual ⚙️ Engine Specifications Primary Engine Engine Options: 2.3L (2309cc) I5 SOHC (5-cylinder, single overhead camshaft) Engine Code: NG (2.3L) Performance Horsepower Rating: Approximately 130-136 hp (depending on market and specific tune) Torque Rating: Approximately 140-145 lb-ft (depending on market and specific tune) Fuel System Fuel Injection: Bosch CIS-E (Continuous Injection System - Electronic) or KE-Jetronic Technical Details Bore X Stroke: 82.5 mm x 90.0 mm Compression Ratio: 10.0:1 Firing Order: 1-2-4-5-3 Engine Placement: Transverse Engine Mounts: Hydraulic mounts for vibration isolation 🔧 Transmission Standard Transmission Type: 5-speed Manual Transaxle (FWD) Optional Transmission Type: ZF 4-speed Automatic Transaxle (FWD or AWD) Features Drivetrain Options: Front-Wheel Drive (FWD) and Audi quattro All-Wheel Drive (AWD) Clutch Type: Hydraulically actuated single dry-plate clutch (Manual) 📐 Dimensions Exterior Wheelbase: Approximately 2611 mm (102.8 inches) Length: Approximately 4335 mm (170.7 inches) Width: Approximately 1700 mm (66.9 inches) Height: Approximately 1390 mm (54.7 inches) Weights Curb Weight: Approximately 1280-1400 kg (2820-3085 lbs) depending on configuration Gross Vehicle Weight Rating: Approx. 1700 kg (3750 lbs) Cargo Trunk Volume: Approx. 0.42 m³ (14.8 cubic feet) Wheels Tires Standard Wheel Size: 14-inch or 15-inch alloy wheels Bolt Pattern: 4x108 mm Standard Tire Size: 185/60HR14 or 195/60HR15 (varies by trim and year) 🛡️ Safety Features Ratings Crash Test Results: No specific government ratings readily available for this era, but German engineering emphasized safety features for the time. Active Features Braking System: Standard front ventilated discs, rear solid discs. Optional Bosch ABS (Anti-lock Braking System). Steering: Power-assisted rack and pinion steering. Passive Features Occupant Protection: Safety cage construction, padded interior, optional driver's side airbag (late models), seat belts (front and rear). Lighting: Halogen headlights, integrated fog lights (optional/standard on higher trims). 💡 Technology Features Infotainment Audio System: Factory AM/FM cassette radio with optional CD player integration. Driver Assistance ABS: Optional Bosch Anti-lock Braking System (ABS) was available on some models. Comfort Features Climate Control: Manual HVAC system with optional automatic climate control on higher trims. Windows Mirrors: Power windows and power-adjustable mirrors were common options. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 7,500 miles (12,000 km) or 12 months, whichever comes first. Timing Belt Replacement: Recommended every 60,000 miles (96,000 km) or 5 years due to interference engine design. Coolant Flush: Every 2-3 years or as per manual recommendation. Fluid Specifications Engine Oil: API SG/SH, SAE 5W-30 or 5W-40 (check specific manual for exact grade and viscosity based on temperature). Coolant: G11 (Blue) or G12 (Pink) antifreeze (ethylene glycol-based) mixed with distilled water (50/50 ratio). Transmission Fluid Manual: VW G 052...