Zoooosh zoooosh zoooooosh noises

[Gio]

Hi all - and thanks for the replies on the other qs. It's been a long day.... The last one for tonight is a new bloody noise.

 

After getting my Z back from replacing the knock sensor (involves removing / replacing the plenum, turbo downpipes and a lot of other stuff) and the O2 sensors, I am now getting a strange zoooshing ( © N Molesworth) noise on hard acceleration.

 

I'd swear blind it wasn't there before. If I'm tootling around, no noises.

 

If I am firm with the loud pedal, as the boost gauge swings past 0, there's a high pitched zoosh. Then the zoosh fades as the gauge goes back down.

 

I am reasonably certain this is not mechanical - there's no horrible vibration or screeching noises or (thank buddha) smoke.

 

The boost gauge (OEM) seems to go as high as it ever did - perhaps a tad higher.

 

I haven't been able to do too many acceleration *ahem* tests as the other half is, shall we say, unimpressed with such behaviour. But I am going to an airfield tomorrow.....

 

Any ideas? Is this what leaky vacuum pipes sound like?

 

Or has the fiddling under the bonnet fixed something which had been not working up to now and they all sound like that sir.

 

Other than the Code 42, everything seems fine with the ECU and all the PCV gubbins was replaced less than 18 months ago.

 

And I've got a skid-pan booked for Saturday!

 

TIA - Gio

[Guest Jeff TT]

BOOST LEAK! most likely the pipes either in or out of the turbo`s

 

Jeff TT

[Scubie]

like the comment about the other half. av the same problem myself (not the zoooshin). hope u find your noise.

[Gio]

Thanks Jeff,

 

will I break it if I keep driving it? Or is this a "can wait a few days" problem?

[Guest Jeff TT]

Gio, assuming boost leaks, then should be ok.

 

Jeff TT

[Gio]

Thanks Jeff,

 

it's another on the list for the bloke to fix - but if there's a problem, expect a phone call!

 

Cheers - Gio

[Guest andyduff]

Could also be the intake gaskets. Either lower-head or upper-lower gaskets...