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Message: <blockquote data-quote="Zoggee" data-source="post: 36710" data-attributes="member: 43">Originally posted by CAJ19@Dec 7 2004, 02:24 PM When I hit hard on the gas pedal, a very high hissing sound comes from the engine bay. Tried to check for loose air hose connections but all were in order. Even took out the intake manifold, still could not trace the source of sound. It happens only when the rev reaches >2500rpm. Issit normal for a 525 single vanos to sound like that when you rev hard???? Sifus, please help  huh...you took out the intake manifold by urself hah??? and you still asking question here....I guess you must be one heck of a D.I.Y khaki too.I dun think there's any vacum or hose leak la bro...better have ur mech to look at it.</blockquote>