Garage Gurus | How to Perform a Relative Compression Test with a Scope

If you suspect that your vehicle’s engine is losing pressure in a cylinder, it can be helpful to perform a relative compression test to determine if all the cylinders have equal compression. Follow along as Master Trainer Mark Kenyon of Garage Gurus demonstrates how to set up an oscilloscope to perform a relative compression test. With the scope and a high-amp clamp hooked up, Mark shows how to navigate to the proper menus and execute the test. He then generates a waveform pattern and explains how to read it. Count on Garage Gurus to help you get your vehicle repair done right.
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The content in this video is for informational purposes only. You should consult with a certified technician or mechanic if you have questions relating to any of the topics covered herein. Tenneco will not be liable for any loss or damage caused by your reliance on any content.

[@marcjones744]

Are those results indicative of a healthy engine? Thanks

[@CarlosSilva-gc8ny]

It's not a healthy engine. Cilinder 1 fail.

[@pantelis241]

Thanks a lot😊

[@samdeamer4535]

Does this work on a diesel?

[@CarlosSilva-gc8ny]

Yes, this method is very usefull in diesel