My BOV(not sure what make as it was on the car when i brought it) makes a ssshhhhhhhhhhhh noise when excelerating before making the swooosh noise when I lift off the excelerater,is this the norm or is it leaking as ive heard it makes more of a mooo noise when leaking?

Thanks

Adam

 

sounds like it is leaking.. get rid of it.

 

so they should make no noise at all untill your foot is lifted off the excellerater?

 

Spot on mate.

 

Adam,
Do u you have an induction kit/filter fitted? If so the 'ssshhhh' will be coming from that as you step on the accl pedal.

Is there a loss in boost?

Imran

 

Northy, from IWOC...

"Q. Why does my 1997 spec. car lose power around 4-5000rpm, plus there I can hear a low resonance hum?

A. There seems to be a recognised problem with the 1997 specification cars blow off valve. This does not shut properly under boost and thus vibrates giving the sound similar to someone blowing across the top of an open bottle. I have also heard that it can also sound like a steam train whistle in extreme circumstances!"


I think the bottle top analogy has also been described as the 'mooing' noise too - so looks like the BOVs stuck partially open with positve pressure in the inlet system. Have you got a mate with a BOV that you could temp swap over so as to cheaply diagnose the problem?