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01-17-2012, 11:12 PM | #1 |
Drives: yaris yx Join Date: Feb 2010
Location: KSA
Posts: 14
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spark plugs problem
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01-17-2012, 11:45 PM | #2 |
Drives: 2013 Yaris Join Date: Oct 2011
Location: Portland, OR
Posts: 914
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I've always thought it's burnt oil, but i could be wrong. is your engine clean or does it have grime?
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01-18-2012, 02:47 PM | #3 | |||
Drives: yaris yx Join Date: Feb 2010
Location: KSA
Posts: 14
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01-19-2012, 12:59 PM | #4 |
Drives: Yaris 1.33 litre 2011 Join Date: Dec 2009
Location: Wigan
Posts: 124
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It is not a big problem because it is no problem at all! It is worse on cars where the plugs are buried deep in the engine which is most cars these days, and covered either by HT lead caps or as in the case of the Yaris coilpacks. Also as stated the service interval for plugs is being extended, in some cases to 100,000 miles whether plugs are serviceable at this mileage remains to be seen.
Regards Geoff Peace |
01-20-2012, 04:57 AM | #5 | |
Drives: yaris yx Join Date: Feb 2010
Location: KSA
Posts: 14
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01-18-2012, 09:23 AM | #6 |
Drives: 2007 Yaris Liftback Join Date: Sep 2006
Location: Chicago
Posts: 129
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that is the result of hot gas's leaking between the metal spark plug body and the ceramic center part.
It is normal and should not be an area of concern but your pictured plugs have more discoloration than I have seen before. It is seen more and more on the "high mileage" spark plugs because they are in service much longer compared to older designs. How many miles are on the plugs? |
01-18-2012, 12:55 PM | #7 | |
Drives: Yaris 1.33 litre 2011 Join Date: Dec 2009
Location: Wigan
Posts: 124
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Regards Geoff Peace. |
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01-18-2012, 03:15 PM | #8 | |
Banned
Drives: yaris Join Date: Jan 2011
Location: earth
Posts: 364
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if it was blow-by, it'd have carbon black on it. |
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