Quote:
Originally Posted by Tcoat
Not to mention that no mater what injection system they use there should be no combustion nor carbon build up in the intake.
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There shouldn't be, but on directed injected engines it's pretty tough to avoid unless you delete the EGR (if it has an external EGR valve and isn't done through camshaft timing like our engine) and install an air oil separator. The build up on the intake ports/valves in my friend's WRX wasn't exactly carbon. It was more of a thick, black, oily goop.