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Message: <blockquote data-quote="96blak54" data-source="post: 1438452" data-attributes="member: 14727">That does look like coolant residue on the ground strap. Scrap it with your finger nail? Both plugs should look the same. The dirty ceramic is a clear indicator of a sparkplug not getting to self cleaning temperature but thats not saying the plug with coolant scabs is cleaning. Moisture in the cylinder will clean out the carbon. Take out all the plugs, keep the numbered to the cylinder. All plugs should look very similar. A small coolant leak may only happen when into the rpm's causing the head to lift. Might be improper deck surface roughness finish for the headgasket not letting the headgasket do its thing. Headgaskets require a certain roughness finish of both deck surfaces to maximize holding potential. A combination of headlift and gasket release lets water weep into the cylinder.</blockquote>