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Hello Oh Powerful and Wise Phil:
Maybe I was not clear enough but here is the situation:
Plug 1 - Black with traces of brown (a bit too rich)
Plug 2 - White with traces of brown (too lean)
Plug 3 - Black with traces of brown (a bit too rich)
Plug 4 - White with traces of brown (too lean)
All colors are uniform throughout the plug including the ceramic and both center and side electrodes.
Since plugs 1 and 3 do not share a carburetor or an exhaust manifold (nor do plugs 2 and 4) I do not think it has anything to do with that. Any other thoughts?
Cheers,
Jeff Pucillo
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