I never said there was a valid fix I just don't count jumping in technology and having issues as a sign one automaker is better than another. We could apply to same to other features like Ford SYNC.
As for DI from my limited understanding of the subject the issues are caused by design with how fuel is sprayed, Toyota and now Honda with the Earthdream engine series are supposed to include port injection. Reading up port injection is supposed to be useful and primarily for around town low load conditions... which is where carbon buildup may most likely occur.
Again not understanding what your problem is.......















