🏷️ Basic Information

Make:

Audi

Model:

90

Product Name:

1988-1992 Audi 90 Workshop Service Repair Manual

Model Years Covered:

1988, 1989, 1990, 1991, 1992

👋 Introduction

Target Audience:

DIY enthusiasts, independent repair shops, Audi owners seeking in-depth knowledge

Value Proposition:

Provides dealership-level repair information for DIY use, saving on labor costs

Alternative Resources:

Dealership service departments, third-party repair manuals (e.g., Haynes, Chilton, which may be less comprehensive)

Illustrations:

Detailed illustrations to guide repair procedures

Support:

Full product support offered by the seller

Satisfaction:

Commitment to 100% customer satisfaction

📋 Manual Details

Primary Coverage:

Comprehensive repair and service procedures

Secondary Coverage:

Wiring schematics, electrical diagrams, computer diagnostic codes

Estimated Page Count:

Varies by specific edition, typically 1000+ pages for full workshop manuals

Type:

Workshop Service Repair Manual

Distinction From Owner Manual:

Technically detailed repair procedures, not owner operation

Language:

English

Digital Format:

PDF

Software Requirement:

None, viewable with standard PDF reader

Search Functionality:

Searchable content via keywords

Navigation:

Bookmarked PDF for easy navigation

📖 Manual Coverage

Powertrain:

Engine mechanical, engine management, fuel system, cooling system, exhaust system, transmission (manual and automatic)

Chassis:

Suspension (front and rear), steering system, braking system (including ABS if equipped)

Electrical:

Ignition system, starting and charging system, lighting, instrumentation, body electrical, power accessories, climate control (HVAC)

Body And Interior:

Bodywork repair, interior trim, safety systems (airbags, seatbelts)

Maintenance:

Fluid changes, filter replacements, tune-ups, inspections

Repair:

Component removal, disassembly, inspection, repair, reassembly, and installation

Diagnostics:

Troubleshooting guides, fault code interpretation, diagnostic procedures

Special Procedures:

Transmission rebuild, engine overhaul, AC system service, airbag system servicing

Depth:

Detailed step-by-step instructions with illustrations for minor and major repairs

Diagnostic Codes:

Coverage of specific diagnostic trouble codes (DTCs) for computer-controlled systems

Wiring Diagrams:

Comprehensive electrical schematics for all vehicle systems

📊 Manual Specifications

File Type:

PDF

File Organization:

Single file with bookmarks

Quality:

Designed for clear readability and printability (digital format)

Binding:

Not applicable (digital format)

Paper Type:

Not applicable (digital format)

⚙️ Engine Specifications

Engine Code Examples:

JN (2.3L 5-cylinder), NF (2.2L 5-cylinder), KG (2.2L 5-cylinder Turbo)

Engine Type:

Inline 5-cylinder, naturally aspirated and turbocharged

Displacement:

2.2L (2226 cc) and 2.3L (2309 cc)

Horsepower Range:

Approximately 130 hp to 165 hp (naturally aspirated) and 180 hp (turbocharged Quattro)

Torque Range:

Approximately 137 lb-ft to 164 lb-ft (naturally aspirated) and 200 lb-ft (turbocharged Quattro)

Fuel Delivery:

Bosch CIS-E (Continuous Injection System - Electronic) or Motronic EFI

Fuel Type:

Unleaded gasoline

Ignition System:

Electronic ignition, distributor-less ignition (some later models/variants)

🔧 Transmission

Transmission Type:

5-speed manual transmission

Transmission Type:

4-speed automatic transmission (ZF automatic often used)

Drivetrain:

Front-wheel drive (FWD) or Quattro all-wheel drive (AWD)

Manual Transmission Fluid:

GL-4 or GL-5 gear oil (e.g., SAE 75W-90 or 80W-90)

Automatic Transmission Fluid:

Dexron III or equivalent (check specific vehicle documentation)

📐 Dimensions

Body Styles:

Sedan (B3 chassis) and Coupe (Typ 89)

Wheelbase:

Approximately 2600 mm (Sedan), 2545 mm (Coupe)

Overall Length:

Approximately 4500-4550 mm (Sedan), 4340 mm (Coupe)

Curb Weight:

Approximately 1300-1500 kg (depending on drivetrain and equipment)

🛡️ Safety Features

Crash Test Data:

Limited official crash test data available from this era for this specific model, but generally considered robust for its time.

Braking:

Front ventilated discs, rear solid discs. ABS (Anti-lock Braking System) available on some models.

Stability:

Quattro all-wheel drive system significantly enhances stability and traction.

Airbags:

Driver-side airbag became standard in later years of this generation (late 80s/early 90s).

Seatbelts:

Front and rear seat belts. Pre-tensioners on front belts in some variants.

💡 Technology Features

Audio System:

Factory AM/FM/Cassette stereo. Optional CD player available. Speaker configurations vary.

Cruise Control:

Available as an option or standard on higher trim levels.

Bluetooth:

Not available on this model.

HVAC System:

Manual or automatic climate control systems available, with comprehensive diagnostic and repair procedures covered in the manual.

🔧 Maintenance

Oil Change Interval:

Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions and oil type used. Consult manual for specific recommendations.

Timing Belt Replacement:

Critical for 5-cylinder engines. Typically recommended every 50,000-60,000 miles or 4-5 years. Failure can cause severe engine damage.

Spark Plug Replacement:

Approximately every 30,000 miles, depending on plug type.

Engine Oil:

API SG or higher, SAE 10W-40 or 5W-40 synthetic recommended. Check manual for exact viscosity based on climate.

Coolant:

G11 specification (blue coolant) or equivalent OAT/HOAT antifreeze mixed with distilled water (50/50 ratio).

Brake Fluid:

DOT 3 or DOT 4.

Engine Mounts:

Can degrade over time, leading to increased vibration.

Fuel Accumulator:

Can fail on CIS-E systems, causing hard starting or poor performance.

Electrical Connections:

Corrosion on grounds and connectors can cause intermittent issues.

Heater Core:

Can leak, causing coolant loss and a sweet smell in the cabin.

ABS Sensors:

Can fail, triggering ABS warning light.

📚 Vehicle History

Brand Focus:

Audi, a German luxury vehicle manufacturer known for its engineering and quattro all-wheel-drive systems.

Generation:

B3 generation Audi 80/90 (Typ 89 chassis), succeeding the B2 generation.

Positioning:

The Audi 90 was positioned as the more upscale variant of the Audi 80, often featuring more powerful engines and higher trim levels, particularly with the 5-cylinder engines and quattro system.

Production Years For Model:

1986-1991 (B3 generation)

Manufacturing Locations:

Ingolstadt, Germany

🏆 Awards & Recognition

Model Performance:

The 5-cylinder engines and quattro system were praised for their smooth power delivery and all-weather capability.

Safety Perception:

Audi's reputation for build quality and safety was established during this period.

Manual Provider:

Likely produced by a reputable automotive technical publisher or directly from OEM sources.