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CC hybrid with 1.8L engine has loud noise that can be heard from inside the cabin(Middle east version)

7.6K views 5 replies 5 participants last post by  Dusty  
US version (2.0lt gas) has both direct fuel injection and port fuel injection. Toyota calls this system the D-4S or Dynamic Force Engine.

Direct injection fires fuel directly into the high compression combustion chamber, which requires very high fuel pressures, much like a diesel engine except for the ignition source (which is why it sounds similar at idle). However it is not disturbing as you have mentioned and it takes around a minute to switch port fuel mode which is pretty much quite.