[jatabe]

Hello Folks.


My 944 N/A is having another temper tantrum. Aa a a a gh!!!!

There was this loud whistle which appeared to be coming from the vacuum check valve (I believe that is what its called). This valve is blue on one end and black on the other. One end has a Y piece.

I was advised to replace the vacuum check valve. I replaced both the Check valve and the Y piece. When ever I drive my car, the system starts this loud sharp whistle that I can hear even while my windows are closed.
I got home yesterday and disconnected the vacuum check valve and the whistling stopped then I reconnected it again(Note: the engine was still running while it did this). I got in the car again and after driving for a few minutes, the whistling started again.

Any ideas?