What You Can Learn From a Spark Plug – Plus How to Test Them With a Basic Multimeter – YouTube

In this video I show you how you can visually inspect a spark plug and what you can learn about how your engine is working by the different deposits and discolorations you see on the tip of the plug. I also show you how you can use a basic multimeter to perform some basic test to determine whether a spark plug is good or bad.

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