Engine Controls - Theory & Operation: Introduction

This article covers basic description and operation of engine performance-related systems and components. Read this article before diagnosing vehicles or systems with which you are not completely familiar.

NOTE: Some states in the Northeast have adopted California emission standards. Refer to Underhood Vehicle Emissions Control Information Label for specific emission specifications and setting procedures.

NOTE: Metro is equipped with standard or upgraded emission systems. Standard emission systems include all XFi models and base models with automatic transaxle and Federal emissions. Upgraded emission systems include base models with manual transaxle and base models with automatic transaxle and California emissions. Refer to Underhood Vehicle Emissions Control Information Label for specific emission specifications and setting procedures.