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Location: Kita-Ku, Sapporo, Japan
Registered: January 2003
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Re: Spark Plug Tea Leaf Reading ?
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Tue, 10 May 2005 07:15

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problem is, most of those spark plug charts were back in the days of leaded fuel, and running unleaded doesn't give rise to as nice a colour change (afaik) black is still rich, but apart from that..
since you have one black one, that cylinder is either getting more fuel, more oil (from rings etc), or the other three have air leaks 
compression test?
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