Originally Posted by Adriel

Headed home last night and a sound like a buzzing, almost like a playing card on a bicycles spokes came from the turbocharger. It got really bad getting onto the freeway, but when we pulled off, it quit. That is when the boost gauge which is loose separated from the hose. Could a manifold leak cause this? Went away once I bent over the tube and taped it that way so no more leaks.

Further, have a performance issue after the engine has run at 85*C for a while. Keep at it and becomes really sluggish until you get off the freeway and get the temperature below for a while. Any ideas?