🏷️ Basic Information

Make:

Audi

Model:

80

Year:

1991

Chassis Code:

B4-8C

👋 Introduction

Target Audience:

Audi 80 owners, independent repair shops, DIY enthusiasts seeking dealership-level technical information.

Vehicle Segment:

Compact executive car, competing with models from BMW, Mercedes-Benz, and other European manufacturers, known for its solid build and refined driving experience.

Value Proposition:

Provides vehicle-specific, factory-authorized repair data, unlike generic repair guides, empowering users to perform maintenance and repairs with confidence and accuracy.

Accessibility:

Single PDF manual, easily navigable, printable pages, compatible with various operating systems.

Data Organization:

Comprehensive, one-stop resource, eliminating the need to consult multiple physical manuals.

📋 Manual Details

Primary Coverage:

1991 Audi 80 (B4-8C) all models and all repairs A-Z

Estimated Page Count:

Varies by specific Audi documentation, but described as 'complete' and 'everything you will ever need'.

Type:

Service and Repair Manual

Language:

English

Format:

PDF

Compatibility:

Compatible with Windows Vista 32/64, XP, ME, 98, NT, 2000, and Mac operating systems.

Software Requirements:

Requires Adobe PDF Reader and Winzip (or equivalent unzipping software).

📖 Manual Coverage

Powertrain:

Engine, Fuel Service Specifications, Emission Control, Intake/Exhaust/Cooling, Lube, Ignition/Starting/Charging, Auto Transmission/Clutch, Manual Transmission, Transfer/Propeller Shaft, Drive Shaft, Differential, Axle/Suspension

Chassis And Body:

Brake Control, Brake, Parking Brake, Steering Column, Power Steering, Tire & Wheel, Engine Hood/Door, Exterior & Interior, Windshield/Glass/Mirror, Instrument Panel, Seat

Electrical And Electronics:

Electrical, Control System, Suppl Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter/Audio/Visual, Horn, Multiplex/CAN Communication

Maintenance:

Scheduled maintenance, fluid changes, filter replacements, lubrication

Diagnostics And Repair:

Step-by-step repair instructions for all listed systems, troubleshooting guides, wiring schematics, diagnostic procedures

Engine Overhaul:

Comprehensive procedures for engine disassembly, inspection, repair, and reassembly, including piston ring replacement, bearing services, cylinder head work, and valve adjustments.

Suspension And Steering:

Detailed instructions for servicing ball joints, tie rod ends, wheel bearings, shock absorbers/struts, power steering pump, and rack and pinion.

Brake System Repair:

Service of brake calipers, master cylinder, wheel cylinders, parking brake mechanism, and hydraulic line replacement.

Electrical Troubleshooting:

Extensive wiring schematics for all circuits, diagnostic steps for common electrical faults, starter motor, alternator, battery service, and lighting systems.

Body And Interior Repair:

Procedures for door panel removal, window regulators, seat adjustments, instrument cluster removal, and minor body panel repairs.

Air Conditioning Service:

Procedures for diagnosing and repairing the A/C system, including refrigerant handling, compressor service, and leak detection.

Engine Immobilizer Service:

If equipped, includes details on the function, diagnosis, and potential repair of the engine immobilizer system.

Depth:

Factory-level detail, equivalent to dealership technician manuals, covering everything from basic maintenance to complete overhauls and complex diagnostics.

Troubleshooting Guides:

Includes diagnostic flowcharts and symptom-based troubleshooting to identify and resolve problems efficiently.

📊 Manual Specifications

File Type:

PDF

Searchability:

PDF format allows for text searching, aiding in quick location of specific information.

Printability:

Fully printable, allowing for enlarged images and printing of specific pages.

Image Resolution:

High-resolution diagrams and illustrations suitable for detailed viewing and printing.

Binding:

Digital (PDF), eliminating physical wear and tear.

Physical Format:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Options:

The 1991 Audi 80 (B4-8C) was typically offered with a range of inline-four cylinder engines. Specific displacements and power outputs would vary by market and trim level, commonly including 1.6L, 1.8L, and 2.0L configurations. The manual would cover these variants.

Engine Code Examples:

While specific codes aren't provided, typical Audi engines of this era included codes like NP, PM, JN for petrol engines, and AAZ for diesel variants if applicable to the market.

Power And Torque:

Specifications for horsepower and torque outputs for each engine variant will be detailed within the manual.

Fuel Delivery And Management:

Includes fuel injection systems (e.g., Bosch KE-Jetronic, Motronic), fuel pump specifications, injector testing, fuel pressure regulation, and related diagnostics.

Emission Control Systems:

Details on catalytic converters, oxygen sensors, EGR valves, and related emission control components and testing procedures.

🔧 Transmission

Standard Transmission:

Likely a 5-speed manual transmission for many models.

Optional Transmission:

Often available with an automatic transmission (e.g., 3-speed or 4-speed automatic).

Transmission Overhaul And Service:

Covers clutch replacement, transmission fluid specifications and change intervals, gearshift linkage adjustments, and overhaul procedures for both manual and automatic transmissions.

Transfer Case And Differential:

Service and repair procedures for front and rear differentials, including fluid changes and seals.

📐 Dimensions

Body Styles:

The B4 platform was primarily offered as a 4-door sedan (8C) and a 5-door Avant (station wagon). Specific dimensions would be listed in the manual.

Cabin Features:

Details on interior components, seating adjustments, and dashboard layout would be included.

Curb Weight:

Curb weight specifications for different engine and body style configurations would be present.

Towing Capacity:

If applicable, towing capacity specifications would be included.

🛡️ Safety Features

Crash Test Information:

While official crash test ratings from the early 1990s may be limited, the manual would detail the vehicle's safety structure and components.

Braking System:

Details on ABS (if equipped), brake rotor and pad specifications, brake fluid types, and bleeding procedures.

Steering System:

Details on power steering fluid, pump, hoses, and steering rack maintenance and repair.

Restraint Systems:

Information on seat belts, pretensioners, and the Supplemental Restraint System (SRS) which would include airbags if fitted.

💡 Technology Features

Audio Systems:

Information regarding factory radio/cassette systems, speaker replacement, and antenna systems.

Instrument Cluster Diagnostics:

Information on diagnosing and repairing warning lights, gauges, and indicator functions within the instrument panel.

Cruise Control:

Details on the operation, diagnosis, and repair of the cruise control system.

Electrical Systems Integration:

Coverage of various electrical control modules and their integration within the vehicle's systems.

🔧 Maintenance

Recommended Maintenance:

Detailed schedule for oil changes, filter replacements, timing belt inspections/replacements, spark plug changes, coolant flushes, brake fluid changes, and other routine services.

Engine Oil:

Specifies recommended SAE viscosity grade (e.g., 5W-40, 10W-40) and API service classification for engine oil.

Coolant:

Type of antifreeze/coolant (e.g., G11, ethylene glycol-based) and recommended mixture ratio.

Brake Fluid:

DOT specification for brake fluid (e.g., DOT 3, DOT 4).

Transmission Fluid:

Specific ATF type for automatic transmissions and manual transmission oil specifications.

Common Wear Items:

Likely includes information on potential wear points such as suspension bushings, CV joints, exhaust systems, and aging electrical components. Timing belt service is critical.

Timing Belt Failure:

Critical importance of timely timing belt replacement to prevent catastrophic engine damage.

Cooling System Leaks:

Potential for coolant leaks from hoses, radiators, and water pumps due to age.

📚 Vehicle History

Audi Legacy:

Audi's reputation for quattro all-wheel drive (though many 80 models were front-wheel drive), build quality, and refined engineering.

B4 Generation:

The B4 generation (1991-1994) represented a significant update over the B3, featuring a more modern design, improved chassis, and updated powertrains.

Manufacturing Details:

Information on assembly locations and production timelines for the 1991 model year.