my wife's eco boost had to have a new short block at 50,000 miles , luckily she had an extended warranty on it , wouldn`t buy a Ford without it !!!FORD ECO-BOOST = Cheaply made engines to Boost FORDS Economy.
From what I understand, many direct injection engines (at least gasoline) suffer from carbon buildup, but on the backs of the intake valves and valve stems. If I understand it right, a port injected, throttle body or carbureted engine all have fuel vapor as it goes past the back of the intake valves, and this has a cleaning effect. On a direct injected engine there is no cleaning effect and thus, carbon buildup.I've been reading some white papers from SAE media describing many GDI engines require head removal and valve blasting with walnut shells at 50 to 70K miles because of massive carbon buildup. Cost estimate is like $2,000 for this service.
From what I understand, many direct injection engines (at least gasoline) suffer from carbon buildup, but on the backs of the intake valves and valve stems. If I understand it right, a port injected, throttle body or carbureted engine all have fuel vapor as it goes past the back of the intake valves, and this has a cleaning effect. On a direct injected engine there is no cleaning effect and thus, carbon buildup.