I have a 2007 GMC Yukon XL. It has 90,000 miles on it. Oil pressure started going down and the engine made a ticking noise. Took it to a mechanic and he replaced the oil pump and the cam shaft, and the oil injector nozzles. Soon I had more problems and the mechanic found one of the valve springs broken. The engine started emitting blue smoke and the engine rattles. A computer diagnosis showed # 6 plug not firing. The plug was covered with oil. I changed the valve seals, piston rings, etc but the diagnosis kept showing # 6 not firing and there is still oil on the spark plug.
have the same problem?
Monday, September 14th, 2009 AT 6:32 PM