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I had that problem 2 years ago and found the solution. If you want to see if your problem is the same I got, do the following test: Open the gaz door. Look at the right side of the door when open. There is a hole. Cover it with a piece of tape and go for a road test. If the noise as disappeared, the problem is related to one or both shutoff valves that are exhausting through that hole. Follow Copy & paste the link below, I already explain what parts are needed (for my 2003, 986, 2.7) maybe different for your year car but the process is probably the same.
Good luck.

Thierry


[url=http://www.renntech.org/forums/topic/33970-strange-whistling-sound/page__p__180569__hl__tolum#entry180569][/url]

I had that problem 2 years ago and found the solution. If you want to see if your problem is the same I got, do the following test: Open the gaz door. Look at the right side of the door when open. There is a hole. Cover it with a piece of tape and go for a road test. If the noise as disappeared, the problem is related to one or both shutoff valves that are exhausting through that hole. Follow the link below, I already explain what parts are needed (for my 2003, 986, 2.7) maybe different for your year car but the process is probably the same.
Good luck.

Thierry


[url=http://www.renntech.org/forums/topic/33970-strange-whistling-sound/page__p__180569__hl__tolum#entry180569][/url]