Your classic Coupe de Ville is a thing of beauty, design and engineering - and you depend on your Cadillac repair manual to keep it running smoothly. If you are a classic car lover - or want to keep your new SUV running - you'll find the repair manual to be the most valuable tool in your garage. A dedicated DIYer will have the same kind of information that the repair shops use for routine maintenance and repair jobs. By consulting the repair manual, you'll get the specs on the smallest details of car parts. If you are struggling to diagnose an intermittent problem, the repair manual will provide charts to help you troubleshoot that glitch in your fuel system that is sapping your gas mileage and creating lean misfires. That same manual will provide you with wiring diagrams to check the circuitry between your Engine Control Unit, the oxygen sensor and the fuel injectors. If you must diagnose if the oxygen sensor is, indeed, being sluggish, then a diagnostic chart will help you as you check the voltage on the component and its wiring. A manual that helps you with diagnosis and troubleshooting is invaluable when struggling to pinpoint a problem that could come from multiple components. An index and a glossary will make the process easier and quicker for a dedicated DIYer like yourself.