Motor Age Technical Editor, Brandon Steckler is Back again! And this time with his third video in the series of “Learning how to learn.” His approach this time is to create an engine mechanical fault and use the relative compression test to discover which of the six cylinders is faulted.
Once again, the Pico 4-trace labs scope and High current amp probe will be used to capture a relative compression trace. A second channel of the scope will be used to capture an ignition sync waveform from one of the cylinders. This data is acquired using a secondary ignition capacity probe around one of the spark plug cables.
Stick with Brandon as he first studies the vehicle’s configuration, just like he does when he is facing a challenge in the shop. Pay attention as he walks you through (in real-time) the setup and operation of the lab scope. Witness Brandon capture the effect of cylinder compression on the starter motor and how it is reflected in the “Relative Compression” waveform.
After capturing the data from the engine when it is healthy, Brandon removes a spark plug and re-captures the same data. This is what experimentation is all about! This is the stuff Brandon used to get “GOOD”! Grab a chair and watch how easy it is to begin your journey to being a more efficient, knowledgeable, and confident diagnostician.
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