Writern

Thank you everybody for spending time on this puzzle. I think vacuum leak of some kind might be in the line here, but I will also try with a stetoscope or something to locate the source. Problem is that the car is at the garage that performed the overhaul at the moment. They cant figure it out, so I try to get input from others to help them get this fixed. They even called a specialist on Porsche, and let him listen to the noice over telephone. He suggested vacuum leak, but wasnt sure, because he had never heard that kind of sound from a Porsche engine before.

DGaunt

how 'bout a tensioner going south and occasionally the chain is running loose?