This comprehensive workshop repair service manual provides detailed information for the 1986-1991 BMW 3-Series (E30) M3 (US) model. It is designed to be a complete resource for anyone working on these vehicles, including mechanics, enthusiasts, and DIYers. The manual covers all aspects of repair and maintenance, from basic troubleshooting to complex rebuilds.

You'll find detailed instructions and diagrams for every system, including:

* **Engine:** This section covers everything from mechanical components and lubrication to cooling, control systems, fuel delivery, and the exhaust.
* **Transmission/Transaxle:** This section includes information on clutches, manual and automatic transaxles, and related components.
* **Driveline/Axle:** This section details the front and rear axles, covering components and repair procedures.
* **Suspension:** This section covers the front and rear suspension systems, including road wheels and tires.
* **Brakes:** This section details the brake system, parking brake system, and brake control system.
* **Steering:** This section provides detailed information on power steering and steering systems.
* **Restraints:** This section covers seat belts and the supplemental restraint system (SRS).
* **Body:** This section includes information on the body, locks, and security systems; glass, window systems, and mirrors; roof; exterior and interior; the instrument panel, seats, and more.
* **Air Conditioner:** This section covers the air conditioner system.
* **Electrical:** This section provides comprehensive wiring diagrams and detailed information on starting and charging systems, lighting, driver information systems, wipers, washers, horns, the body control system, the LAN system, audio-visual, navigation and telephone systems, auto cruise control, power supply, grounds, and circuit elements.
* **Maintenance:** This section provides guidance on routine maintenance procedures.
* **Index:** A comprehensive alphabetical index makes it easy to quickly find the information you need.

The 1986-1991 BMW E30 M3, a homologation special designed for Group A racing, epitomized the essence of the "ultimate driving machine." This iconic model stands as a testament to BMW's dedication to motorsport and its engineering prowess. The E30 M3's distinctive features, including flared wheel arches, a prominent rear spoiler, and a wide, aggressive stance, set it apart from its standard 3-Series counterpart. Under the hood, a 2.3-liter S14 four-cylinder engine, a masterpiece of engineering, provided exhilarating performance. This high-revving powerplant, capable of producing 192 horsepower and 170 lb-ft of torque, was matched to a precise five-speed manual gearbox, allowing for both spirited driving and a rewarding connection between driver and machine. The E30 M3's suspension was meticulously tuned for exceptional handling, while its lightweight construction ensured exceptional agility and responsiveness.

More than just a performance car, the E30 M3 represented a pinnacle of automotive engineering. Its meticulous design and construction, combined with its potent engine and finely-tuned handling, made it a true driver's car. The E30 M3's influence extended beyond the track, inspiring a generation of enthusiasts and collectors. Today, the E30 M3 remains a coveted classic, prized for its timeless design, exceptional performance, and historical significance. Its legacy continues to influence the modern-day BMW M3, ensuring that the spirit of the original E30 M3 lives on.