Colour of spark plugs

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Oct 3, 2007 | 11:04 PM

JjCoDeX75

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From: Exeter

Colour of spark plugs

Hi gurus

So what does it mean when the tops of your sparks are brown in colour? (kinda like rusty colour brown)?

JJ

Oct 4, 2007 | 05:55 AM

tabetha

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From: uk

Brown ring around the base of the Porcelain(sp) is normal caused by high voltage micro frying oil particles, mist in the air attracted to the plug, nothing to worry about.
It is called CORONA DISCHARGE.
Have a close look for STREAKS up the porcelain as this indicated bad leaks of electric, normal for some bosch plugs as they are crap, and the streaking is tracking, will be all around the base of the plug .
tabetha