Diagnosing Injector Knocking in Diesel Vehicles: A Comprehensive Guide to Engine Noise Diagnosis and Injector Testing. Injector knocking is a prevalent issue in diesel vehicles, resulting in excessive engine noise, vibration, power loss, and decreased fuel efficiency. This video provides a detailed explanation of how to identify injector knocking on a running vehicle, common causes of injector knock, and the appropriate diagnostic method without removing injectors. Key topics covered include sym