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strange hissing noise

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A strange hissing /whistling noise happens when I change gears up above 4.000 rpm or when I release the accelerator pedal abrupty;

The noise comes from the engine bay and from under/behind the dashboard at the same time and gets louder at high rpms

I have been looking for a disconnected hose in the engine and under/behind the dashboard to no avail.

Any ideas ?

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Leaky boost gauge tube?

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Hi Thomas ,

 

Do you mean a tube that is connected to the boost gauge on the dashboard ?

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I think I' found it on the parts list.

Do you know where this pipe connects in the engine bay for I seem to hear the noise coming from the car's rear as well ?

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I was thinking of the noise under the dashboard when I replied. I don't recall where the boost line attaches to the plenum/manifold, but I doubt you'd have the tube leaking audibly in both places. Could you be hearing something from the the waste gate system?

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I will check that asap for the car can't be started for the time being due to a water pump hose issue since yesterday.

(pls see my other post)

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