Mitsubishi do a machine for cleaning the backs of the valves for there GDI engines that suffered with valve carbon build up , it is a air fed pressure nozzle that uses .... wait for it ...... crushed nuts .... crushed Brazil nut cases to be exact , close the valves give em a blast then vaccum out any debris .
Don't want dirty valves or dirty manifolds ?? Get rid of the Black Death maker ..... EGR
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