Diagnosing misfire complaints is a common job in the bays. In this class, we will discuss a practical and effective approach to misfire diagnostics. The instructor will discuss air: fuel, ignition, and mechanical misfire testing procedures. We will also discuss modern day “ghost misfires”. A variety of vehicle case studies will be used to assist in explaining the use of misfire diagnostic techniques. A strong emphasis will be placed upon scan data interpretation in order to determine what type of misfire is to be diagnosed.