Quote Originally Posted by UR LOSN View Post
clean the threads out. I would look for any exhaust leaks from the TOG's...

if not.....you may have some blow by.....
If the TOG's were leaking there wouldn't there be black on the outside of the plug? The black is only on the threads but it is completely covered. Just as if you taped off the rest of the plug and spray painted the threaded portion.