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Discussion Starter · #1 ·
When I replaced spark plugs last time, I noticed that two of the ignition coils have a funny-looking surface. At first I thought they were caked with greasy oil, but the uneven texture is the surface itself and is rock hard. It looks like the plastic has melted or been attacked by a chemical reaction. The spark plug tubes are fine and clean, so I struggle to figure out how this happened. The coils were in the car when I bought it in late 2019, and I have not had any functional issues with them so far.

My question is: what might cause this, and should I worry about it?

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