Spark plug analysis

peeeot

Well-known member
I have been noticing some funny colors on my spark plug insulators for a while now. Attached are three photos from cylinder 1's plug: back, front, and front again after using a fine dremel wire brush on the insulator. I though it strange that the insulator turned silvery because I used the same wire brush on the external white ceramic and it polished it clean. Any thoughts on what you see here?





 
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