This comprehensive workshop service manual is specifically designed for the Porsche 928 S4, covering model years 1987 through 1991. It's a valuable resource for both professional mechanics and knowledgeable car owners seeking detailed guidance on maintaining and repairing their vehicles. The manual delves into a wide range of topics, providing step-by-step instructions for various procedures. From routine maintenance like tune-ups and oil changes to complex repairs involving engine and transmission disassembly, this manual covers it all. Its detailed information encompasses areas like fuel systems, ignition systems, lubrication systems, exhaust systems, electrical systems, and bodywork. The manual also includes detailed diagrams, illustrations, and specifications to aid in understanding and completing repairs correctly. Whether you're troubleshooting a minor issue or tackling a major overhaul, this service manual provides the essential information to confidently address any repair need for your Porsche 928 S4.

The Porsche 928 S4, produced from 1987 to 1991, was a high-performance grand touring car that marked a significant evolution of the 928 series. The S4 inherited the elegant, aerodynamic design of the earlier 928 models, characterized by its sloping front end, distinctive pop-up headlights, and a long, flowing rear. This sleek profile offered a blend of sportiness and practicality, providing ample space for four occupants and luggage. Building upon its predecessor, the 928 S4 incorporated a powerful 5.0-liter, 32-valve, naturally aspirated V8 engine. Generating 310 horsepower and 310 lb-ft of torque, this engine propelled the 928 S4 from 0 to 60 mph in just over 5 seconds, with a top speed exceeding 150 mph. The S4 also benefited from refined suspension and steering systems, allowing for precise handling and a comfortable ride. Beyond performance, the 928 S4 offered a luxurious and well-equipped interior. High-quality materials and craftsmanship were evident throughout the cabin, featuring comfortable leather seats, a comprehensive instrument panel, and advanced features for its time. The 928 S4's innovative transaxle layout, placing the transmission at the rear axle, provided exceptional weight distribution, contributing to the car's balanced handling and dynamic performance. This combination of power, comfort, and sophistication made the 928 S4 a desirable and sought-after grand touring car. Despite its limited production run, the 928 S4 established itself as a worthy successor to its predecessors, cementing its place in Porsche's rich automotive history. Today, the 928 S4 remains a collectible and appreciated classic, attracting enthusiasts with its distinctive design, potent engine, and refined driving experience.