Carbon deposits are a normal occurrence in an engine, but can build up over time, causing problems. Essentially, heat, pressure, and oxidation can transform unburned fuel into a black soot-like ...

Direct-injected engines helped modern vehicles produce better fuel economy and stronger performance, but mechanics are increasingly warning that carbon buildup has become a serious long-term ...

Before the turn of the millennium, you wouldn't find many people complaining about carbon deposits on engine valves. However, all of that changed as gasoline direct injection (GDi) went mainstream in ...