[s-cars] Boost leak - update, what am I missing here?

[Mike Claire]

Outstanding generous offer Chris, and I've had similar offers from others.
I really couldn't own this car without this list.

I'm in southern NH, and things got bad enough a couple days ago that I
reached out to my buddy Keith Schofield (QU4TRO on Audiworld) who lives in
the town right next to me.  I went over to his place yesterday to swap coil
packs (another issue, thankfully behind me).  I think if I had a particular
thing to swap he'd be happy to oblige.



Mike



On 4/21/07, chris chambers <fastscirocco_2000 at yahoo.com> wrote:
>
> Mike,
>
> I second the suggestion that you may have a bad WGFV (or failing)
>
> What type of boost gauge do you have, is it possible the gauge is
> failing and you've convinced yourself you have lost power? You might
> want to consider borrowing a gauge from someone to test.
>
> Where does your gauge hook up to read boost? Perhaps the problem
> lies there??
>
> Where are you located? With my S4 down for now I'll be glad to
> loan you any parts you need that might help you diagnose this.
> My car has a new WGFV on it (and other parts), and I'm in Kalamazoo
> MI and get to the Toledo/Sylvania OH area every week.
>
> HTH
> Chris
>
>
> --- Mike Claire <mike.claire at gmail.com> wrote:
>
> > A bunch of you guys replied to me last week with ideas, and I
> > appreciate the
> > help.  I've gone through everything suggested, and have read
> > everything
> > about these issues I could find on Scott Mockrey's site,and STFA with
> > abandon.  I'm pretty much tapped - nothing to show for it.  I was
> > distracted
> > this week by new symptoms - and ultimately #3 coil just failed
> > entirely.
> > Dead short.  That's fixed now and the car runs great again - except
> > it's
> > still low on boost.
> >
> > (subject is a '93 S4, MTM 1+ (Pastore) chip.  Used to indicate 22 lbs
> > on
> > A-pillar gauge.  Now it peaks at 16 or 17, and backs down from
> > there.)
> >
> > I'm either losing boost - or not making enough of it.  I don't know
> > where
> > else to look - what am I missing here?
> >
> > 1.  Pressure tested main intake plenum to 15 lbs with a compressor
> > and PVC
> > cleanout plugged into the intake boost.  Closed off Samco where it
> > enters
> > the intake, and the ISV - PASSED
> >
> > 2.  Pressure tested all the small hoses in the PCV circuit, water
> > trap, ECU
> > connection, boost gauge connection, etc. etc.  PASSED
> >
> > 3.  Removed BPV, plugged the Samco, plugged vacuum line (eliminate
> > possibility of BPV leaking pressure).   PASSED
> >
> > 4.  Removed silicone line from wastegate, plugged it shut (to test
> > for
> > possibility of wastegate opening prematurely)  PASSED
> >
> > I can only think of two possibilities - either the turbo is no longer
> > capable of building normal boost, or the intake plenum is leaking at
> > pressures higher than 15 lbs.
> >
> > Could the turbo be failing?  It sounds the same and drives the same
> > as ever
> >
> >
> > I can take the Samco off the turbo outlet and pressure test from
> > there, but
> > I don't have compressor plug handy for that.
> >
> >
> > Before I do that - any ideas?
> >
> >
> > Mike
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> >
>
>
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>
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