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  #1  
Old 05-26-2005, 01:46 PM
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Join Date: Feb 2002
Location: east coast
Posts: 1,255
what is this on my plugs?

anyone know what causes the brown caramel like substance on the ceramic portion of the spark plug as shown in the picture?
The substance will scrape off.
My spark plug wells were nice and clean when I removed the plugs.
I saw nothing that revealed a coolant or oil leak?




Scott
1998
C-230
75Kmiles on car
40K miles on spark plugs

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what is this on my plugs?-spk-plg.jpg  
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  #2  
Old 05-26-2005, 03:33 PM
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Join Date: Jul 2004
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That is blow-by on that plug. Small leak between the ceramic insulator and the surrounding metal.
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  #3  
Old 05-26-2005, 04:03 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
Quite normal.
I see that on my plugs, when I change them at 30 k miles.

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2007 C 230 Sport.
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