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2001 Forester S auto
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330 Posts
Discussion Starter · #1 ·
Does anyone know what could cause the center electrode of spark plug in cylinder 1 to have this irregular slanted shape after about 35,000 miles? Rest assured, that I was replacing all plugs when I pulled this one, but it just seems so weird compared to all the others. Any advice appreciated.

 

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2013 crosstrek, Forester+
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150 Posts
Might have been improperly gapped when installed. Also notice the ceramic seems to show burnt oil so perhaps plug tube seal is leaking, which may cause arcing thus degraded spark voltage = higher amperage = faster wear. Check also plug wire.
 
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