A couple of things can ease your mind. First off, you can do a compression check on all of the cyliners and see if they are all about the same. If the two that have a build up on the plugs are lower than the other 4, you may have a major engine problem. If they all test ok, then I would turn my attention to fuel delivery. It sounds like you are running rich, atleast on those two cylinders. A bad fuel injector could be a couse, or a bad fuel regulator. The engine computer controls the flow of fuel to mix with the air for proper burn. If one of the sensors giving the computer has gone bad, it can give false reading to the computer causing it to make more fuel than it needed.
I would say though, since only two plugs show signs of running rich, it may be a problem with the injectors at those cylinders.
Monday, July 31st, 2006 AT 8:54 PM