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Discussion Starter #1
Auto Observer reports that the issue is the tendency of direct injected or DI engines to build up a layer of carbon or soot around the intake valves that can over time significantly affect the performance and economy of the engines. The soot is able to build up in a DI engine because unlike a port injected engine there is no constant spray of fuel that can keep the deposits washed away.

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Boyadjiev said that he paid $1,200 to have the engine cleaned of carbon deposits and when the car went back to the same dyno it put down an extra 41 AWHP. Different engine designs are also having less of an issue with carbon build up so some of the issue lies with the engineers that design the motors.
DailyTech - Direct Injected Engines from Some Automakers are Seeing Reduced Performance
 

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Somaek juseyo?
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is our cars direct injected?
Nah, ours use the more common multi-point fuel injection (MPFI) with the fuel injected near the intake opposed to each cylinder directly. Supposedly the direct version yields more power and fuel efficiency among other benefits, so I guess this article is surprising.
 
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