The Porsche 928 S4 1987-1991 Service Repair Manual provides comprehensive and detailed information on all aspects of servicing and repairing your vehicle. This manual covers every system and component of your Porsche 928 S4, including the engine, transmission, suspension, brakes, electrical system, and more. The manual features clear and concise instructions, accompanied by numerous illustrations, exploded diagrams, drawings, and photos, guiding you through every procedure with ease. You'll find thorough explanations of all installation, removal, disassembly, assembly, repair, and check procedures, laid out in sequential order for optimal clarity. The manual also includes special notes, important points, service data, precautions, and adjustment and repair operations referencing service tool numbers. Where tool usage isn't obvious, the tool is illustrated in use. This manual is a valuable resource for both professional mechanics and DIY enthusiasts, providing everything you need to maintain and repair your Porsche 928 S4, ensuring optimal performance and longevity. The manual also includes a periodic maintenance chart for scheduled maintenance, ensuring your vehicle remains in top condition.

The Porsche 928 S4, produced from 1987 to 1991, was a high-performance grand touring coupe that marked the pinnacle of the 928 model line. This generation retained the iconic, sleek design of its predecessors, but with substantial improvements in both power and handling. Sporting a larger 5.0-liter V8 engine, the S4 boasted an impressive 316 horsepower, catapulting the car to a top speed of 157 mph. This engine was coupled with a five-speed manual or a four-speed automatic transmission, offering drivers a choice between spirited engagement and effortless cruising. The S4's handling dynamics were also improved with a revised suspension system, featuring new spring rates, shock absorbers, and anti-roll bars for enhanced stability and precision. Beyond its powerful performance, the 928 S4 offered a luxurious and comfortable interior. Leather upholstery, wood trim, and a well-appointed dashboard were standard, creating a plush and well-rounded driving experience. The 928 S4 also came standard with a suite of safety features, including anti-lock brakes, power steering, and multiple airbags. While the 928 S4 was a remarkable car in its time, it ultimately faced challenges in the marketplace. The decline in popularity of grand touring coupes in the late 1980s, coupled with the emergence of the immensely popular Porsche 911, led to a decline in 928 sales. However, the 928 S4 remains a highly sought-after classic, praised for its potent performance, elegant design, and luxurious amenities.