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rseller
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I have a 2004 Cayenne S. It has travelled 67000 KM. It suddenly ran rough recently and after investigation it was discovered that No 7 cylinder had no compression. The top of the piston is immobile in the bore when viewed by a boroscope. It does not move when the engine is tuned over which leads us to believe that the crown of the piston has separated from the body. The car is now with Porsche to work out what :( to do. Any comments?