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In this video I will be showing you how to use starter current to determine cylinder compression. First I will show you a known good pattern, then I will simulate a no compression problem in one cylinder by removing a spark plug. Finally, I will show you how to synchronize the starter current waveform with an ignition firing event in order to determine which cylinder in the firing order has the compression problem.
Engine Performance Diagnostics chapter 1 pages 17-23
- check engine light (code 26)
- no driveability complaints
- replaced engine computer and all 6 fuel injectors
- cranking compression test with a scope and high amp probe
- how to synchronize a compression waveform to ID the no compression cylinder
- how to perform a clear flood crank
- how to use a single trigger setting on a scope
- how to set a filter on a scope waveform
- Picoscope Automotive 4 Channel Scope
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium. There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!