sounds like.....

I had an interesting sound develope this weekend. It is most evident at 65mph when the engine is pulling, 3000 RPMs or so. It sounds like an air hose is leaking from the engine compartment. A high hissing sound. At low idle & stop & go driving the noise is not noticable. The only thing I can figure that would generate that kind of pressure under high RMP is the turbocharger. There is no loss of power or change in performance of the car. Any advice or ideas would by worth their weight in gold (or deisel fuel).


85 300d 232k