[s-cars] Boost loss

[Kirby Smith]

...and while pressure testing, be sure to block the hose from the turbo
intake multi-port hose to the crankcase ventillation (goes to the head,
IIRC).  Else, you will not only pressurize the intake, but also the
crankcase, possibly blowing a crankcase seal.  (I thought that happened
to me, but it turned out my slow drip of oil from the clutch area was
due to a tired transmission seal.)

kirby


Richard Tanimura wrote:
> 
> A bit of advice. Visual check for leaks are pretty unreliable.
> Borrow/build a pressure tester and pressurize the system. Then listen
> for the leak. You may find that it is not the hoses but the clamps or
> O-rings that are bad.
> Rich
> 
> On Mon, 28 Jun 2004 10:30:59 +0100, Luke Heathcote
> <lheathcote at tftguildford.com> wrote:
> >
> > Hi Folks,
> >
> > Well, ive had my S4 for a month and the fun has started.....
> >
> > Driving home last week I got a violent pulsing of power under boost, on then off then on again, each pulse lasting under a second. It was fine off boost.
> > Since then any boost results in a huge easily heard pressure leak (pedestrians certainly noticed!!!) and no more than about 1.4bar on the gauge when I tested it. The car sounds like its being blown down the road with compressed air, which it is I suppose:-). Expecting a hose problem, I took off and inspected all three yesterday, and they appear ok other than a small area in the BPV 'feed' hose which looked a bit thin, but I didn't think that was it (I got the first aid kit out and gave it a PTFE and insulating tape bandage to see if it helped). Even so, I can feel a set of Samco's coming on!!:-)
> > I also checked the wastegate diaphram, again no problem.
> > So could it be the BPV stuck open? Does anyone know whether you would hear the boost leaking out (presumably back through the filter box) if the BPV has had it? Any other ideas out there? Sorry if this has been covered before.
> >
> > On a separate vein, how useful is the Bentley manual for european S4s. It seems a lot of money if there are many differences between euro and US cars and it covers the US model only?
> >
> > Thanks in advance for any help and guidance. I'm stuck using the bike for now, in Britain, whilst Wimbledon is on. Who thinks im gonna get soaked!!!! Ahhhh.:-)
> >
> > Luke Heathcote
> >
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