I have a 2004 Porsche Cayenne S v8 4.5l 200000 km in Calgary, Alberta - Canada and have the same issue with the knocking noise. The knock is coming from the 8th cylinder, I have checked / swapped knocking sensors, replaced crankshaft followers, spark plugs and ignition coils as well but no luck. Everything online has been pointing to a scored cylinder; have anyone been able to get it fixed by any means other than replacing the whole motor?
Any recommendations to who can actually rebuilt the engine in Alberta, Canada?
Thanks & Cheers,