Misfire faults have been related to conditions like loose/damaged electrical connections, poor circuit grounds and more.
Knock sensors are mounted on the block near the base of the cylinder head.
Any time you’re dealing with a combustion engine, there’s a chance it will develop a misfire. A better understanding of how computer systems analyze a misfire can make your job that much easier as the service tech.
In this tip clip, instructor Jim Wilson talks about P0300 codes and misfire testing using your scan tool. He talks about how you would look at certain things such as RPM, MAP, changes in load, and long term fuel trims. He goes on to mention some things technicians should be aware of on Ford and Chrysler vehicles.
Some of the most frustrating codes for a technician to handle are the p 300s. Do you have the knowledge and confidence needed to handle your next misfire in your bay, by recognizing solutions for misfires and tough codes?
Instructor John Thornton presents this in depth comprehensive case study of a 2002 Ford Explorer 4.0L vin E with a misfire at idle speed. John details the use of his scope and pressure transducer to perform a cranking compression test and goes on to point out the various indicators you should be watching your scope pattern for and how to identify problems.