I had a meeting this week with several service managers from a major auto manufacturer (not GM). One of the SMs raised the question whether any of the others have experienced any problems with DI engines? He went on to say that he has seen carbon buildup on the valves (didn't specify intake or exhaust, suspect exhaust) and that the carbon enters the piston cylinder area thus increasing piston/cylinder wall wear because the carbon is like sandpaper.
So far BITOG'ers have been concerned with DI fuel dillution, are there more DI hidden concerns?
So far BITOG'ers have been concerned with DI fuel dillution, are there more DI hidden concerns?