🏷️ Basic Information

Make:

Audi

Model:

90 Quattro

Year:

1990

Chassis Code:

Type 89

👋 Introduction

Positioning:

Targeted at DIY enthusiasts and independent repair shops seeking authorized and accurate repair information.

Target Audience:

Audi enthusiasts, owners performing DIY maintenance and repairs, independent mechanics.

Competitors:

Comparable to official Audi factory service manuals (if available digitally), Haynes, and Chilton manuals, but with the advantage of digital convenience and potentially more current updates within the licensed scope.

Features:

Licensed OE materials, instant online access, user-friendly interface, comprehensive coverage, cost-effective compared to traditional printed manuals or dealership service.

📋 Manual Details

Primary Coverage:

Comprehensive Service and Repair

Estimated Page Count:

Varies by specific software version, but typically hundreds of pages for full coverage.

Type:

Digital Service and Repair Manual Software

Licensing:

Officially Licensed, derived from OE (Original Equipment) materials.

Language:

English

Format:

Online Access (Web Browser)

📖 Manual Coverage

Engine:

Engine mechanical, lubrication system, cooling system, fuel system, ignition system, emission control systems, engine management (ECU).

Drivetrain:

Manual and automatic transmissions, clutch, driveshafts, differential, Quattro all-wheel-drive system.

Suspension Steering:

Front and rear suspension components, shock absorbers, springs, steering rack, power steering system.

Brakes:

Hydraulic brake system, disc brakes (front and rear), ABS (Anti-lock Braking System) components, parking brake.

Electrical:

Battery, charging system, starting system, lighting system, instrumentation, body control modules, wiring diagrams.

HVAC:

Heating, Ventilation, and Air Conditioning (HVAC) system, components, and service procedures.

Body Chassis:

Body panels, doors, windows, interior trim, chassis components, rust prevention.

Fuel System:

Fuel pump testing, fuel pressure regulation, injector diagnosis and cleaning (if applicable to CIS-E).

Cooling System:

Radiator, water pump, thermostat, cooling fans, heater core, pressure testing.

Exhaust System:

Catalytic converter, mufflers, exhaust pipes, emission control components.

Maintenance:

Routine maintenance tasks, fluid changes, filter replacements, spark plug replacement, belt adjustments.

Repair Rebuild:

Component removal, installation, overhaul, and repair procedures for all major systems.

Diagnostics Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting, electrical system diagnostics, component testing.

Engine Management:

Engine control unit (ECU) diagnosis, sensor testing, actuator testing, fuel injection system adjustments.

Chassis Alignment:

Front and rear wheel alignment specifications and procedures.

Electrical Schematics:

Detailed wiring diagrams for all major electrical systems, crucial for troubleshooting.

Torque Specifications:

Precise torque values for all critical fasteners during assembly and disassembly.

Special Tools:

Identification and usage instructions for specialized tools required for certain repair procedures.

Depth:

Comprehensive, covering everything from basic maintenance to complex diagnostics and full component rebuilds.

📊 Manual Specifications

Digital Format:

Web-based application accessed via standard web browser.

Digital Quality:

High-resolution text and diagrams, clear and legible.

Digital Access:

Yearly subscription with renewal discounts.

Digital Platform:

Compatible with PC, Laptop, Smartphone, Tablet with internet access.

⚙️ Engine Specifications

Engine Type:

Naturally Aspirated Inline-5 Cylinder (I5)

Displacement:

2.3 Liters (2309 cc)

Engine Code:

NG

Bore X Stroke:

82.5 mm x 92.8 mm

Compression Ratio:

10.0:1

Horsepower:

Approximately 130 hp @ 5700 rpm (may vary slightly by market)

Torque:

Approximately 140 lb-ft @ 3500 rpm (may vary slightly by market)

Fuel Delivery:

Bosch CIS-E (Continuous Injection System - Electronic) or later Bosch Motronic fuel injection.

Fuel Type:

Unleaded Gasoline (Premium recommended)

🔧 Transmission

Transmission Type:

5-speed Manual Transmission

Transmission Type:

4-speed Automatic Transmission

Drivetrain:

Permanent All-Wheel Drive (Quattro)

📐 Dimensions

Body Styles:

Sedan (4-door), Coupe (2-door)

Curb Weight:

Approx. 3000-3200 lbs (depending on body style and options)

🛡️ Safety Features

Crash Testing:

Information on 1990 safety standards and any available crash test data would be in the manual.

Braking System:

Anti-lock Braking System (ABS) often standard on Quattro models.

Restraints:

Seat belts, potentially driver-side airbag (depending on market and options).

💡 Technology Features

Audio System:

Factory-installed AM/FM stereo with cassette player. Options for upgraded sound systems were available.

ABS:

Anti-lock Braking System (ABS) as a key driver assistance feature for enhanced braking control.

Features:

Limited by era; primarily focused on vehicle systems rather than external connectivity.

🔧 Maintenance

Oil Change:

Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions. Manual will specify exact intervals and oil type.

Timing Belt:

Crucial interval, typically around 50,000-60,000 miles or 5 years. Failure can cause severe engine damage. Manual will detail replacement procedure.

Engine Oil:

API SG or higher, SAE 5W-40 or 10W-40. Capacity ~4.5 liters. Manual provides precise specification and capacity.

Coolant:

G11 coolant (blue/green) or equivalent with antifreeze properties. Capacity ~7.0 liters. Manual specifies type and capacity.

Brake Fluid:

DOT 3 or DOT 4. Manual provides exact specification.

Transmission Fluid:

Manual: Gear oil SAE 75W-90 GL-4. Automatic: ATF Type 'T' or equivalent. Manual specifies exact type and capacity.

Common Problems:

Degradation of coolant hoses and O-rings, premature wear of suspension bushings, ABS sensor failures, potential for head gasket issues if overheated, aging electrical connectors, distributor cap/rotor wear.

Cis E Issues:

Serviceability of the Bosch CIS-E system can be complex; proper diagnosis and adjustment are critical. Manual details diagnostic procedures.

📚 Vehicle History

Heritage:

Audi, a German manufacturer, has a long history of engineering innovation, particularly known for its Quattro all-wheel-drive system, which revolutionized rallying and road cars.

Evolution:

The Audi 90 Quattro was a premium compact executive sedan/coupe in Audi's lineup, representing the higher-spec variant of the Audi 80/90 family (Type 89 generation). It succeeded earlier Audi models and paved the way for future Audi performance sedans.

Production Period:

The Type 89 generation, including the 90 Quattro, was produced from roughly 1986 to 1995, with the 1990 model year falling within this period.