After about five minutes of engine run-time, a high-pitched whine will start to emanate from the engine. The noise seems to respond to engine load; it will occur at idle, and when I take off it will briefly pitch down, as if it was responding to the increased load on the engine. However, it isn't regular -- it might stop altogether, and then re-appear, sometimes for just a second or two, or it will stop completely. There doesn't seem to be a predictable pattern, other than the five minute thing. The engine seems to operate exactly as it always does.
I'm thinking maybe it's a pulley or belt tensioner, perhaps. Could it be a vacuum leak, as some have suggested? I'm pretty much at a loss here.
have the same problem?
Thursday, May 8th, 2014 AT 12:54 PM