The Audi 90 B3 1986-1991 Service Repair Manual provides comprehensive repair and service information for your vehicle. This detailed manual is designed to be a valuable resource for both do-it-yourselfers and experienced mechanics. It includes step-by-step instructions based on complete vehicle disassembly, accompanied by numerous photos and illustrations to guide you through each procedure.

This manual covers a wide range of topics, including:

* General Maintenance
* Troubleshooting
* Engine Service / Repair
* Transmission Service / Repair
* Brake System
* Wiring Diagram
* Electrical System
* Suspension
* Periodic Lubrication
* Steering
* Cooling System
* Fuel Injection
* Fuel System
* Emission System
* Heater / Air Conditioner
* Engine Control System
* Chassis / Body
* Restraint System
* Interior
* Differential / Drive
* Axle

The information in this manual is designed to help you keep your Audi 90 B3 running smoothly. You'll find everything you need to perform routine maintenance, diagnose and fix problems, and even complete more complex repairs.

The Audi 90 B3, produced from 1986 to 1991, marked a significant step forward for Audi in the mid-sized executive car segment. It was the successor to the Audi 80 B2, and while sharing some platform components, represented a significant departure in design and technology. The B3 generation 90 sported a more aerodynamic and modern design, with a longer wheelbase, wider track, and a more spacious interior. It was also the first Audi to feature a fully galvanized body, which significantly enhanced its resistance to corrosion.

Under the hood, the 90 B3 offered a range of powerful and refined petrol engines, including the iconic 2.0-liter 115 hp engine from the Audi 80, as well as more powerful 2.3-liter and 2.6-liter units. The top-of-the-line 2.6-liter engine, paired with Audi's Quattro all-wheel-drive system, provided exhilarating performance and exceptional handling. The 90 B3 also introduced several innovative features, including an advanced multi-link rear suspension for improved ride and handling, a more sophisticated dashboard with improved ergonomics, and an optional ABS system for enhanced braking performance. The 90 B3 was a testament to Audi's engineering prowess and its commitment to building cars that were both stylish and technologically advanced, paving the way for the success of future Audi models.