Welcome to RennTech.org Community, Guest
I have a 2006 3.2 Cayenne. When I accelerate normally the engine sounds slightly like a diesel until i reach 1900 to 2000 rpm. If I accelerate fast I also get loud engine rattle noise at around 3000, if I drive normal the rattle is not very prominent. No power loss shifts smooth. The engine rattle noise does increase with rpm but disappears around 4000 rpm when car shifts. No rattle at 3000 rpm normal acceleration. Any thoughts?