🏷️ Basic Information Identification Make: Audi Model: 90 Model Variant: Coupe / Quattro / Sedan Generation: Type 85 / Type 89 Codes Model Code: Type 85 (pre-facelift), Type 89 (facelift) 👋 Introduction Market Position Segment: Compact executive car / luxury compact sedan and coupe. Target Audience: Individuals seeking a premium, performance-oriented compact vehicle with advanced (for the era) technology and German engineering. Competitive Analysis Key Competitors: BMW 3 Series, Mercedes-Benz 190E, Acura Integra, Honda Prelude, Ford Sierra (Europe). Key Features Unique Selling Points: Standard Quattro all-wheel drive (on many models), refined 5-cylinder engine, premium interior appointments, advanced aerodynamic styling. Manual Value Proposition Utility For Owner: Essential for identifying correct replacement parts, understanding part numbers, and performing DIY maintenance or repairs efficiently. Utility For Professional: Indispensable tool for parts departments and independent workshops to quickly source correct Audi components. 📋 Manual Details Coverage Areas Covered Years: 1988, 1989, 1990, 1991, 1992 Covered Models: Audi 90 Coupe, Audi 90 Sedan, Audi 90 Quattro Covered Regions: Primarily North America (US DM/Canada specifications) Page Count Estimated Pages: Varies by specific catalog, typically 500-1000+ pages Manual Type Type: Parts List Catalog / Parts & Service Catalog Language Language: English Format Format: Printed 📖 Manual Coverage Systems Covered Engine: All engine variants (2.3L 5-cylinder). Engine Mechanical: Engine block, cylinder head, pistons, crankshaft, camshafts, valvetrain, timing belt, oil pump, cooling system components, intake and exhaust manifolds. Fuel System: Fuel tank, fuel pump, fuel filter, fuel injectors, fuel lines, fuel pressure regulator, intake manifold, throttle body, fuel injection control unit (ECU). Ignition System: Distributor, ignition coils, spark plugs, spark plug wires, ignition control module (ICM). Transmission Manual: Clutch assembly, gearbox components, shift linkages, drive shafts, differentials (manual transmission variants). Transmission Automatic: Automatic transmission internals, torque converter, valve body, transmission control unit (TCU), cooler lines (automatic transmission variants). Drivetrain Quattro: Front differential, rear differential, center differential (viscous coupling unit), drive axles, CV joints (Quattro models). Brakes: Brake calipers, brake discs (rotors), brake pads, brake lines, master cylinder, ABS components (if equipped), parking brake assembly. Suspension Front: MacPherson struts, control arms, ball joints, sway bar, bushings, wheel bearings. Suspension Rear: Trailing arms, coil springs, shock absorbers, bushings, control arms, sway bar. Steering: Steering rack, power steering pump, steering column, tie rods, power steering hoses. Electrical System: Battery, alternator, starter motor, wiring harnesses, fuses, relays, lighting system (headlights, taillights, interior lights), horn. Body Panels: Hood, fenders, doors, trunk lid, bumpers, grille, rocker panels, quarter panels. Interior Trim: Dashboard, door panels, headliner, seat upholstery, carpeting, center console, climate controls. HVAC: Heater core, evaporator, blower motor, air conditioning compressor, condenser, refrigerant lines, climate control modules, vents. Wheels Tires: Wheel designs, tire sizes, bolt patterns, lug nuts. Procedures Included Part Identification: Detailed illustrations of all components with corresponding part numbers and descriptions. Assembly Disassembly: Lists all parts required for specific assemblies and provides order of disassembly/reassembly. Cross Referencing: Cross-references for superseded or updated part numbers. Accessory Installation: Parts for factory-installed and dealer-installed accessories. Technical Depth Depth: Highly detailed for parts identification, interchangeability, and exploded views. Does not typically include detailed repair procedures or diagnostic flowcharts, which would be found in a separate Service Manual. 📊 Manual Specifications File Format Digital Quality: N/A (Printed format) Print Quality Print Quality: Professional, clear line drawings and text. Binding Type Binding: Typically bound for durability (e.g., spiral-bound, perfect-bound). Paper Type Paper Quality: Durable, often glossy paper for longevity in a workshop environment. ⚙️ Engine Specifications Primary Engine Engine Code: NG (2.3E), KU (2.2E, pre-facelift) Configuration: Inline 5-cylinder, SOHC (Single Overhead Camshaft) Displacement: 2309 cc (2.3 L) Performance Horsepower: 130 hp @ 5700 rpm (2.3L NG) Torque: 137 lb-ft @ 3000 rpm (2.3L NG) Fuel System Fuel Delivery: Bosch KE-Jetronic or CIS-E (Continuous Injection System - Electronic) Fuel Injection Fuel Type: Unleaded Gasoline Engine Features Timing Belt Part Number: 034 109 119 E (example, verify with catalog) Spark Plug Specification: NGK BCPR7ES-11 or equivalent (example, verify with catalog) Oil Filter Part Number: 037 115 561 A (example, verify with catalog) 🔧 Transmission Standard Transmission Type: 5-speed Manual Transaxle Optional Transmission Type: 4-speed Automatic Transaxle Features Quattro Integration: Integral part of Quattro all-wheel-drive system, featuring a center differential. Fluid Specification Manual Manual Transmission Fluid: API GL-4, SAE 75W-90 (example, verify with catalog or specific manual) Fluid Specification Automatic Automatic Transmission Fluid: G 052 162 A1 (Dexron III equivalent, example, verify with catalog or specific manual) 📐 Dimensions Exterior Wheelbase: 2500 mm (98.4 in) Length: 4400 mm (173.2 in) Width: 1700 mm (66.9 in) Height: 1380 mm (54.3 in) - Coupe, 1400 mm (55.1 in) - Sedan Weights Curb Weight: Approximately 1300-1500 kg (2866-3307 lbs), varies by drivetrain and trim. Gross Vehicle Weight Rating: Varies by model, typically around 1800-2000 kg 🛡️ Safety Features Ratings NHTSA Ratings: Ratings for this era are not directly comparable to modern standards; focus on passive...