[s-cars] Boost leak - update, what am I missing here?
mike.claire at gmail.com
Sat Apr 21 19:11:01 EDT 2007
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.
On 4/21/07, chris chambers <fastscirocco_2000 at yahoo.com> wrote:
> 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.
> --- 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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