🏷️ Basic Information

Make:

Audi

Model:

Cabriolet

Year:

1991

Chassis Code:

B4-8G

👋 Introduction

Market Position:

Targeted at Audi Cabriolet B4-8G owners and independent repair facilities seeking comprehensive, factory-level diagnostic and repair information.

Competitive Analysis:

This manual offers a significant advantage over generic repair guides by providing the exact, vehicle-specific information used by dealership technicians, ensuring accuracy and completeness.

Key Features:

Vehicle-specific content, complete A-Z repair coverage, detailed step-by-step instructions, comprehensive diagrams and schematics, digital format for easy access and printing.

Ease Of Use:

Designed for ease of use, with the ability to print specific pages or diagrams, preventing damage to a physical manual and allowing for targeted information access.

📋 Manual Details

Coverage Areas:

All models and all repairs A-Z

Model Year Coverage:

Specifically 1991 models, with the potential to cover minor variations for closely related years within the B4-8G generation.

Manual Type:

Service and Repair Manual

Language:

English

Format:

PDF

Digital Compatibility:

Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible

📖 Manual Coverage

Systems Covered:

Engine, Control System, Mechanical, 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, Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering, Air Conditioning, Supplemental Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/Door, Exterior & Interior, Electrical, Multiplex/CAN Communication

Procedures Included:

Maintenance, Service, Diagnosis, Repair, Troubleshooting, Component Replacement, System Adjustments, Wiring Schematic Interpretation

Engine Repair Procedures:

Complete engine overhaul, cylinder head service, piston and ring replacement, valve timing adjustment, crankshaft and bearing inspection, engine mounts replacement.

Transmission Repair Procedures:

Detailed steps for manual transmission gear selection cable adjustments, clutch hydraulic system service, and automatic transmission solenoid testing and replacement.

Suspension And Steering Procedures:

Front and rear suspension component replacement (struts, control arms, bushings), wheel bearing service, steering rack diagnosis and repair, power steering pump and hose replacement.

Brake System Procedures:

Brake pad and rotor replacement, brake caliper service, brake line inspection and replacement, ABS sensor testing, parking brake adjustment.

Electrical System Procedures:

Comprehensive wiring schematics for all electrical circuits, troubleshooting guides for common electrical faults, component testing (starter, alternator, battery), lighting system repair, diagnostic connector access.

Body And Interior Procedures:

Convertible top mechanism troubleshooting and repair, door panel removal, seat adjustment and replacement, instrument panel removal and repair, exterior trim component replacement.

Technical Depth:

Factory high-detail, vehicle-specific, step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications for complete repair

Diagnostic Procedures:

In-depth diagnostic trees and troubleshooting flowcharts for identifying and resolving various mechanical and electrical issues.

Calibration And Adjustment:

Procedures for calibrating systems like throttle position sensors, idle control valves, and ensuring correct ignition timing.

📊 Manual Specifications

File Format:

PDF

Print Quality:

Printable pages, high-resolution diagrams and illustrations, zoomable images

Searchability:

PDF format allows for text searching within the document for specific terms or components.

Binding Type:

Digital (PDF), no physical binding

Paper Type:

Not applicable (digital format)

⚙️ Engine Specifications

Primary Engine Options:

Likely includes naturally aspirated inline-four and V6 engines common to the Audi 80/90 platform of this era. Specific engine codes (e.g., ABK, ACE, ACK, ADR) would be detailed in the manual.

Performance Data:

The manual will provide detailed specifications for horsepower, torque, RPM ranges, and performance-related adjustments for all covered engine variants.

Fuel System Details:

Comprehensive coverage of fuel injection systems (e.g., Bosch Motronic), fuel pump operation, pressure regulation, injector testing, and troubleshooting.

Emission Control Systems:

Detailed explanations and repair procedures for emissions control components such as catalytic converters, oxygen sensors, and EVAP systems.

Engine Management System:

Detailed information on the engine control unit (ECU) and its functions, sensor data interpretation, and diagnostic trouble codes (DTCs).

🔧 Transmission

Standard Transmission:

Likely a 5-speed manual transmission.

Optional Transmission:

Likely a 4-speed automatic transmission (e.g., ZF 4HP18).

Transmission Features:

Manual provides repair and maintenance procedures for both manual and automatic transmissions, including clutch replacement, gearbox overhaul, torque converter service, and transmission fluid specifications.

Gear Ratios:

Specific gear ratios for both manual and automatic transmissions will be provided for optimal performance and diagnostic reference.

📐 Dimensions

Exterior Dimensions:

The manual will contain precise exterior dimensions, wheelbases, track widths, and ground clearance specific to the B4-8G Cabriolet chassis.

Curb Weight:

Specifications for curb weight and Gross Vehicle Weight Rating (GVWR) will be available for different configurations.

Towing Capacity:

Towing capacity information, if applicable, will be detailed.

Wheelbase:

The manual will detail the exact wheelbase measurement for the B4-8G chassis.

Wheel Bolt Pattern:

Information on standard wheel sizes, offset, and the bolt pattern (e.g., 5x112mm) will be included.

Recommended Tire Sizes:

Factory-recommended tire sizes and pressure specifications for optimal handling and safety.

🛡️ Safety Features

Safety Ratings:

While specific NHTSA or Euro NCAP ratings for this specific model and year might be scarce, the manual will detail the vehicle's safety features as designed and implemented by Audi.

Active Safety Features:

Information on ABS (Anti-lock Braking System) operation and diagnostics, and other active safety systems of the era.

Seat Belt Systems:

Details on pre-tensioning seat belt mechanisms and their service requirements.

Passive Safety Features:

Detailed guidance on Supplemental Restraint Systems (SRS), including airbag system diagnostics and replacement procedures, seat belt mechanisms, and body structure integrity.

💡 Technology Features

Infotainment Systems:

Coverage for the original factory audio systems, including radio, cassette player, and speaker diagnostics and repair. Information on instrument cluster readouts and warning lights.

Instrument Cluster Diagnostics:

Troubleshooting for gauge failures, warning lights, and the central information display.

Driver Assistance Features:

Details on cruise control systems and their troubleshooting. ABS system diagnostics are also covered under safety features.

Connectivity Features:

Basic electrical system schematics will detail wiring for accessories and control modules of the period, not modern connectivity.

🔧 Maintenance

Service Intervals:

The manual provides factory-recommended service intervals for oil changes, filter replacements, brake inspections, fluid checks, timing belt replacements (critical for these engines), and other routine maintenance tasks.

Timing Belt Replacement Interval:

Crucial interval for timing belt replacement, typically around 60,000 miles or 4-5 years, including associated tensioners and idler pulleys.

Fluid Specifications:

Detailed specifications for engine oil (viscosity grade and API service classification, e.g., VW 500 00), coolant (type and mixture ratio), brake fluid (DOT rating), power steering fluid, and transmission fluid (type and capacity).

Engine Oil Capacity:

Specific oil capacity for various engine displacements covered.

Coolant Capacity:

Total engine cooling system coolant capacity.

Known Issues:

The manual will likely address common wear items and potential issues for the era, such as suspension component wear, electrical connector corrosion, aging rubber hoses, and convertible top mechanisms.

Convertible Top Maintenance:

Specific guidance on hydraulic fluid levels, seal maintenance, and motor operation for the power convertible top system.

📚 Vehicle History

Brand Heritage:

The manual is for a model from an era where Audi was solidifying its reputation for engineering and luxury, building on the foundation of the Quattro lineage.

Model Evolution:

The B4-8G Cabriolet is a convertible variant based on the Audi 80/90 (B4) platform, known for its robust chassis and refined styling, representing a significant step in Audi's convertible offerings.

Platform Basis:

Based on the Audi 80/90 (Typ 89/8C) platform, known for its transverse engine mounting and front-wheel or all-wheel drive (though Cabriolet is typically FWD).

Production Years:

The B4-8G Cabriolet was produced from 1991 to 2000, with the 1991 model being the first year of this generation. The manual specifically covers the 1991 model year and likely extends to related years within this generation.