Probably so as when the engine runs leaner it’s the porcelain that cleans up not the rest, ground strap excluded.
when you look down into the deep part of the plug, what colors are there?
Could not get a good shot of the porcelain down deep.. but it was white as far as I could see.
Looking at the ground strap I might have a bit too much timing in it. Will check and adjust again today. IIRC that coloration should not go all the way to the body of the plug.
