whistling sound from engine

[Tone]

Hi,

Hope someone can help me diagnose this problem, when I rev my engine with lid open there is a clear whistling\poping sound comming from the engine as I lift off and back on.

When driving the revs make a higher pitched sound and power lags before changing up.. seems like a lot more fuel is being burnt..

I have been advised it may be a gasket or valve attached to a vaccum pipe.

Anyone else had any similar issues?

Cayenne V6 -04

Thanks,

T

[70Sixter]

The only whistle I've had was from a burned cylinder head in my 911 that warped from the air leak. It was after a repair and the shop ate the cost of a new cylinder and head. Not cheap when almost nobody carried 90mm pistons/cylinder - even in San Diego.

Recommended getting it checked as soon as you can.