What Causes Spark Plug Deposits

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=7fSRZlu3z0M

A spark plug has a glossy black coating on the insulator of the spark plug. The cause of these deposits could be caused by any of the following except: • A) Worn piston rings • B) Stuck open EVAP purge valve • C) PCV Valve Stuck Open • D) Worn Valve Seals • Tomorrow's Tech: https://www.tomorrowstechnician.com • Autolite: https://www.autolite.com

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