Burned spark plug ceramic

Mallory PSW Ceramic 135° Univ/Wire Set 947C

Burnt ceramic on spark plugs

Cache Valley Autocare - Burn marks around the bases of the ceramic of your spark plugs indicate issues with your plugs and motor; no worries, we can help! #CacheValleyAutocare #LOGANutah

A Burnt Spark Plug: How Do I Know Symptoms?

Spark plug ceramic burnt? : r/BmwTech

Spark plug question

What are the consequences of a spark plug breaking off inside the engine? - Quora

A Burnt Spark Plug: How Do I Know Symptoms?

Burned spark plug ceramic