Theory & Operation
WARNING: This page does not describe the selected car, but rather 2388 other vehicles, including the 2003 Volvo XC90, 2003 Volvo XC70, 2003 Volvo V70, 2003 Volvo V40, and 2003 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
This article is generic in nature and all information does not apply to all vehicles. For vehicle specific information, see the appropriate articles in the ENGINE PERFORMANCE category.
This article covers basic THEORY & OPERATION of engine performance-related systems and components. Before diagnosing vehicles or new systems with which you are not completely familiar, read this article.