This comprehensive workshop repair service manual provides a wealth of information for the BMW 3 series E21, covering models from 1975 to 1984. It offers detailed instructions, diagrams, and illustrations to guide you through all aspects of maintenance, repair, and troubleshooting. The manual encompasses a wide range of topics, including general maintenance procedures, troubleshooting guides, engine service and repair, transmission service and repair, brake system diagnostics and repair, wiring diagrams, electrical system information, suspension analysis and repair, periodic lubrication schedules, steering system maintenance, cooling system repair, fuel injection and fuel system repair, emission system diagnostics, heater and air conditioning service, engine control system troubleshooting, chassis and body repair, restraint system maintenance, interior components, differential and drive system repair, and axle maintenance. This meticulous manual is a valuable resource for both experienced mechanics and DIY enthusiasts. It is written in a clear and concise manner, making it easy to understand and utilize. By leveraging the comprehensive information within this manual, you can confidently tackle a variety of repair tasks, saving time and money in the process.

The BMW 3 Series E21, produced from 1975 to 1984, marked the beginning of BMW's iconic 3 Series lineage. This compact executive car, known for its sporty handling and elegant design, was a significant departure from its predecessor, the 1800/2000 series. While the previous models were based on the Neue Klasse platform, the E21 introduced a new, lighter, and more rigid chassis designed by Paul Bracq. This allowed for a more agile driving experience, a key element of the 3 Series identity. The E21 was originally offered with a range of four-cylinder petrol engines, including the legendary M10, known for its power and durability. The E21 was lauded for its exceptional handling and performance, thanks to its well-balanced chassis and precise steering. Its rear-wheel drive layout provided a more engaging driving experience, particularly for enthusiasts. Despite its relatively small size, the E21 offered a comfortable and well-appointed interior, with a focus on driver-centric ergonomics. These features, combined with its attractive styling and practicality, made the E21 a popular choice for both young professionals and seasoned drivers. The E21, however, was not without its drawbacks. Its build quality was known to be inconsistent, and some early models suffered from rust issues. Nonetheless, its sleek design, performance, and handling characteristics cemented its place as an early classic and a significant milestone in the evolution of the BMW 3 Series.