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Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

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Old February 15th, 2005, 15:39
TBLimited TBLimited is offline
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Spark plug?

What does it mean when a brand new set of plugs turn coal black after running the engine three times? Also does anyone know how to test fuel injectors with an ohm meter?
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Old February 15th, 2005, 16:58
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RichP RichP is offline
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Re: Spark plug?

Black means rich or you did not let it warm up and come out of it's cold cycle. Could also mean bad rings. Usually in the back of say a chiltons manual they have color pics of plugs with a caption under it about possible causes. Here is an onling pic of plugs and problems
http://www.buckeye-illinois.com/sparkplugs.htm
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