🏷️ Basic Information

Make:

Audi

Model:

80 / 90 / Coupe

Production Years Covered By Manual:

1988, 1989, 1990, 1991, 1992

Vin Locations:

Driver's side of instrument panel visible from outside; Identification label in luggage compartment

Engine Number Location 4 Cylinder:

Stamped on the left-hand side of the cylinder block

Engine Number Location 5 Cylinder:

Stamped on the left-hand side of the cylinder block

👋 Introduction

Positioning:

A comprehensive, official workshop manual catering to owners and independent repair shops seeking in-depth technical information for maintaining and repairing their 1988-1992 Audi 80, 90, or Coupe. It targets enthusiasts and professionals who value accuracy and completeness in repair documentation.

Value Proposition:

Offers a complete, intact, and official resource at a competitive price point, providing instant access and cross-platform compatibility, differentiating itself from potentially incomplete or less official third-party guides.

Features:

2,027 pages of detailed repair information, all models and engines covered, printable PDF format, DRM-free, instant download, comprehensive system coverage, detailed illustrations, and troubleshooting guidance.

📋 Manual Details

Covered Models:

All Audi 80, 90, and Coupe models

Covered Body Styles:

All body styles

Covered Engines:

All engine variants

Total Pages:

2,027

Type:

Workshop Repair & Service Manual

Language:

English

File Format:

PDF

Platform Compatibility:

Windows, Mac, Linux

📖 Manual Coverage

Engine Mechanical:

Detailed diagnosis, repair, and overhaul procedures for all engine variants, including timing belt replacement, cylinder head service, piston and connecting rod assembly, crankshaft and bearing service, lubrication system, and cooling system.

Fuel System:

Diagnosis and repair of fuel injection systems (K-Jetronic, KE-Jetronic, CIS-E), fuel pumps, fuel lines, fuel pressure regulators, and fuel filters.

Ignition System:

Ignition timing, spark plugs, ignition coils, distributor, ignition control module, and electronic ignition troubleshooting.

Transmission Manual:

Repair and overhaul of manual transmissions, clutch system service, shift linkage adjustment, and gearbox fluid specifications.

Transmission Automatic:

Diagnosis and repair of automatic transmissions, including torque converter service, valve body inspection, transmission fluid and filter change, and electronic control unit (ECU) diagnostics.

Drivetrain:

Front-wheel drive axle shafts, CV joints, transaxle service, and rear axle assembly (for Quattro models).

Suspension:

Front and rear suspension component diagnosis and replacement, including struts, shock absorbers, control arms, ball joints, tie rod ends, bushings, and wheel bearings.

Steering:

Power steering system diagnosis and repair, including steering rack, power steering pump, fluid lines, and steering column.

Brakes:

Front and rear brake system service, including brake pads, rotors, calipers, brake lines, master cylinder, brake booster, and anti-lock braking system (ABS) diagnosis.

Electrical System:

Comprehensive coverage of the vehicle's electrical system, including battery, charging system (alternator, regulator), starter motor, lighting systems, horn, wipers, and all control modules.

Climate Control:

Air conditioning system service, heater core replacement, blower motor, and climate control unit diagnosis.

Bodywork Exterior:

Door repairs, panel replacement, bumper service, glass replacement, sunroof operation, and exterior trim.

Bodywork Interior:

Seat removal and repair, dashboard disassembly, interior trim panel replacement, and carpeting.

Safety Systems:

Seat belt mechanisms, airbag system (if equipped), and general safety component checks.

Maintenance:

Oil change intervals and specifications, filter replacements, fluid checks and top-offs (coolant, brake fluid, power steering fluid, transmission fluid), spark plug replacement, air filter replacement, belt inspections and replacement.

Troubleshooting:

Systematic diagnostic procedures for common and uncommon problems across all vehicle systems, including pinpoint tests for electrical faults.

Repair:

Step-by-step repair instructions for component replacement, overhaul, and adjustment for virtually all mechanical, electrical, and body components.

Overhaul:

Detailed procedures for engine, transmission, and other major component overhauls, including clearances and torque specifications.

Diagnostics:

Guidance on using diagnostic tools and techniques to identify the root cause of issues, particularly for electrical and fuel injection systems.

Installation:

Instructions for the proper installation of replacement parts and accessories.

Towing:

Specific instructions for towing, including hook-up points, safety strap usage, towing clearance (6-12 inches), and maximum towing speed/mileage limitations (50 mph/50 mi for both manual and automatic transmissions).

Lifting:

Detailed procedures for lifting the vehicle using a hoist or floor jack, including designated lift points (below diamond-shaped marks in front of rear wheel wells) and the necessity of using a rubber pad with floor jacks to protect the underbody and chassis.

Depth:

Comprehensive, covering everything from basic routine maintenance and troubleshooting to complete engine and transmission rebuilds, advanced electrical diagnostics, and bodywork repairs.

Detail Level:

High, with detailed sub-steps, notes, cautions, warnings, numbered instructions, bold figure numbers, detailed illustrations, drawings, photos, and enlarged insets for part identification.

Wiring Diagrams:

Includes detailed wiring diagrams for ease of use in diagnosing and repairing the vehicle's electrical system.

📊 Manual Specifications

Format:

PDF

Searchability:

Likely searchable text-based PDF due to digital format and cross-platform compatibility, enhancing usability.

Printability:

Yes, printable

Page Quality:

100% complete and intact, no missing or corrupt pages/sections

Binding:

Not applicable (Digital PDF)

Paper Type:

Not applicable (Digital PDF)

Drm Status:

DRM-free, without any restriction

Delivery Method:

Instant download link on checkout page and emailed after payment

⚙️ Engine Specifications

Engine Types Covered:

Includes coverage for various 4-cylinder and 5-cylinder gasoline engines prevalent in the Audi 80/90/Coupe range during the 1988-1992 model years. Specific engine codes and displacements would be detailed within the manual, likely including variants such as the 1.8L, 2.0L, 2.3L (5-cylinder).

Horsepower And Torque:

Detailed specifications for horsepower and torque output for each engine variant are contained within the manual, essential for diagnosis and performance tuning.

Fuel Delivery Systems:

Comprehensive coverage of both carbureted (less common in later years) and fuel-injected systems, including Bosch K-Jetronic and KE-Jetronic (CIS-E) systems, which were common on these models.

Engine Rebuild Specifications:

Includes critical engine rebuild specifications such as cylinder bore tolerances, piston ring gap, bearing clearances, valve seat angles, valve stem seals, and torque specifications for all internal engine components.

Coolant Type And Capacity:

Specific recommendations for coolant type (e.g., G11 or equivalent) and system capacity are provided, along with procedures for flushing and refilling the cooling system.

Oil Type And Capacity:

Specifies the correct engine oil viscosity grade (e.g., 10W-40, 5W-30 depending on climate and engine) and capacity for oil and filter changes, crucial for engine longevity.

🔧 Transmission

Standard Transmission Type:

Manual transmissions (e.g., 4-speed, 5-speed) were commonly standard on many models within this range.

Optional Transmission Type:

Automatic transmissions were available as an option on many Audi 80/90/Coupe models.

Clutch Service:

Detailed procedures for clutch inspection, replacement, and adjustment, including pilot bearing and release bearing service.

Transmission Fluid Manual:

Specifications for manual transmission fluid type and capacity are provided.

Transmission Fluid Automatic:

Defines the specific Automatic Transmission Fluid (ATF) type (e.g., Dexron II or equivalent) and capacity for automatic gearboxes, along with filter change procedures.

📐 Dimensions

Wheelbase:

Specific wheelbase dimensions for different body styles (e.g., Sedan, Coupe) would be detailed in the manual, contributing to handling characteristics.

Overall Length:

Overall length figures for sedan and coupe variants are provided, influencing maneuverability and cabin space.

Curb Weight:

Curb weight variations depending on engine, transmission, and equipment (e.g., Quattro) are detailed, affecting performance and fuel economy.

Gross Vehicle Weight Rating:

GVWR specifications are included for load capacity considerations.

🛡️ Safety Features

Crash Test Results:

While specific NHTSA/IIHS ratings for this era might be limited or vary by region, the manual would cover the vehicle's built-in safety features and their proper function.

ABS:

Procedures for diagnosis and repair of the Anti-lock Braking System (ABS), including sensor checks and hydraulic unit service, where applicable.

Seatbelts:

Information on seat belt operation, maintenance, and replacement of tensioners or retractors.

Airbags:

If equipped with airbags, the manual would detail their operation, diagnostic procedures for the airbag control module, and safety precautions during service.

💡 Technology Features

Radio And Audio Systems:

Coverage of the factory radio, speaker systems, and potential troubleshooting for head unit issues or wiring harness problems.

ABS System:

Detailed diagnostic and repair procedures for the Anti-lock Braking System (ABS), including wheel speed sensor checks and control module diagnostics.

Wiring Diagrams Electrical Connectors:

The manual's comprehensive wiring diagrams are essential for understanding and troubleshooting the vehicle's electrical architecture, including connector pinouts and wire routing.

🔧 Maintenance

Oil Change Interval:

Typical intervals for oil and filter changes would be around 5,000-7,500 miles (8,000-12,000 km) or 6-12 months, with specific recommendations in the manual based on driving conditions.

Timing Belt Replacement Interval:

Crucial for these engines, timing belt replacement intervals are typically in the 60,000-90,000 mile range (96,000-144,000 km), with replacement of the tensioner and idler pulleys recommended simultaneously. Failure to replace can lead to catastrophic engine damage.

Transmission Fluid Change Interval:

Automatic transmission fluid and filter changes are generally recommended every 30,000-50,000 miles (48,000-80,000 km).

Coolant Specification:

G11 coolant or equivalent (typically a blue or green ethylene glycol-based antifreeze) is generally specified for this era of Audi.

Brake Fluid Specification:

DOT 3 or DOT 4 brake fluid is typically recommended, with regular flushing and replacement every 2-3 years to maintain performance and prevent corrosion.

Power Steering Fluid Specification:

Specific power steering fluid type recommended by Audi, often a dedicated hydraulic fluid, is critical to avoid damage to the power steering system.

Common Audi 80 90 Issues:

Potential issues can include aging rubber components (hoses, bushings, CV boots), fuel distributor leaks on K-Jetronic systems, electrical connector corrosion, heater core leaks, and wear on suspension components. The manual provides diagnostic steps to address these.

Preventative Tips:

Regularly inspecting drive belts, hoses, and vacuum lines for cracks or leaks. Monitoring fluid levels and condition. Checking brake pad and rotor wear. Ensuring proper cooling system operation.

📚 Vehicle History

Audi Heritage:

Audi, a German automobile manufacturer, has a history of producing reliable and technologically advanced vehicles. The 80/90 series represented Audi's push into the compact and mid-size premium sedan segments.

Audi 80 90 Evolution:

The Audi 80 and its upscale variant, the Audi 90, were part of Audi's B3 (Type 8A) and B4 (Type 8C) generations. These models were known for their build quality, sophisticated engineering (including optional Quattro all-wheel drive), and distinctive styling, particularly the aerodynamic 'wind-cheating' design introduced with the B3 generation. The Coupe variant offered a sportier, two-door profile.

Production Period:

The models covered by this manual were produced between 1988 and 1992, representing the latter part of the B3 generation and potentially the transition into the B4 generation, which saw significant styling and mechanical updates.

Manufacturing Locations:

Primary manufacturing plants for Audi vehicles of this era were located in Germany (e.g., Ingolstadt).

🏆 Awards & Recognition

Model Awards:

Audi models from this era often received accolades for their engineering, safety, and design, contributing to Audi's reputation for building premium, well-engineered vehicles.