spark plugs problem

[Geoff Peace]

Originally Posted by momo-yx

what causes this problem ???
this brown color in all 4 plugs
Is it big problem or not ???

This is caused by minute oil particles suspended in the atmophere sticking to the plug because of high voltage. No gas is escaping and it is no detriment to the performance of the plug. If it is very bad (much worse than yours) the spark can track up the face of the insulator, known as corona discharge. Can best be seen as blue flashes in the dark.
Regards Geoff Peace.

[A-Dingo-Ate-My-Baby]

Originally Posted by Geoff Peace

This is caused by minute oil particles suspended in the atmophere sticking to the plug because of high voltage. No gas is escaping and it is no detriment to the performance of the plug. If it is very bad (much worse than yours) the spark can track up the face of the insulator, known as corona discharge. Can best be seen as blue flashes in the dark.
Regards Geoff Peace.

I was waiting for this post.

if it was blow-by, it'd have carbon black on it.