[s-cars] Chasing a boost leak -

Sun Apr 15 19:52:08 EDT 2007

Mike,

there is a rubber seak on the cap, check and see if it is soft and
pliable or hard like plastic. It's fairly commong for this seal to
harden from age/heat and leak.

If I recall correctly the seal is replacable, you may not have to
purchase the entire cap.

HTH
Chris

--- Mike Claire <mike.claire at gmail.com> wrote:

> I hope you're right, I'd be catching a break if just changing the oil
> cap
> would fix it.  Does the valve cover actually build pressure to 22 lbs
> (in my
> case, with a 1+ chip)?  I thought pressure would just leave via the
> rubber
> hose that connects to the intake bellows, on the engine side of the
> MAF.
> That wouldn't hold pressure, it goes straight back to the air filter.
> 
> 
> 
> Mike
> 
> On 4/15/07, Vincent Frégeac <s.sikss at gmail.com> wrote:
> >
> > Mike,
> >
> > I think you found the culprit: valve cover oil cap. Mine was the
> > crankshaft
> > breather hose rubber elbow at the back of valve cover, or should I
> say the
> > first leak was... Now it's leaking at the spark plug #3 valve cover
> > gasket... until I repair it and boost find another place to leak.
> >
> >
> >
> > Vincent
> >
> > -----Message d'origine-----
> > De: s-car-list-bounces at audifans.com
> > [mailto:s-car-list-bounces at audifans.com] De la part de Mike Claire
> > Envoyé: 15 avril 2007 11:10
> > À: Ingo Rautenberg
> > Cc: s-car-list at audifans.com
> > Objet: Re: [s-cars] Chasing a boost leak -
> >
> > re: the WGFV - I ran the Motronic diags described on Scott
> Mockrey's site,
> > which includes the WGFV.  I'm talking about the test that checks
> the
> > throttle pot, the injectors, the carbon canister valve, ISV, etc. 
> The
> > WGFV
> > clicks the same as it always has.  Is that good enough to eliminate
> it as
> > a
> > suspect?
> >
> > I have Samcos with breeze clamps.  The entire intake system
> including PVC
> > system pretty much holds 10 or 15 lbs pressure (using a 3 inch PVC
> pipe
> > cleanout with a compressor quick connect tapped into it.  It
> doesn't hold
> > pressure indefinately, it does leak down very slowly.   Mostly
> through the
> > valve cover oil cap.  I had to push down pretty hard on it to build
> > pressure.
> >
> > Bob Myers reminded me to check the ECU connection in the cabin -
> good call
> > because somehow I overlooked it.
> >
> >
> >
> > Thanks again guys, I'm out of ideas of my own.
> > Mike
> >
> > On 4/15/07, Ingo Rautenberg <ingo.rautenberg at gmail.com> wrote:
> > >
> > > Faulty WGFV?  Have you actually removed and examined all of the
> hoses
> > > for possible tears?  Improperly-torqued-down hose clamps - rips
> at
> > > the hose clamps (if oem hoses).  That lower hose at the passenger
> > > side at the turbo seems to be the culprit more often than not
> IME.
> > > One that really threw me off at the track at Road America in
> 2001:
> > > boost leak at the aftermarket VDO boost gauge!
> > >
> > > Hope you find it sooner rather than later!
> > >
> > > Ingo
> > >
> > > On Apr 15, 2007, at 2:26 AM, s-car-list-request at audifans.com
> wrote:
> > >
> > > > From: "Mike Claire" <mike.claire at gmail.com>
> > > > Date: April 15, 2007 2:26:42 AM GMT-04:00
> > > > To: "S-car list" <s-car-list at audifans.com>
> > > > Subject: [s-cars] Chasing a boost leak -
> > > >
> > > >
> > > > Gents:  After spending some time in the Home Depot plumbing
> > > > department, I
> > > > figured I'd make short work out of my boost woes.  But, no joy.
> > > >
> > > > The subject is a '93 with a metal crossover, all-metal
> intercooler,
> > > > Samcos,
> > > > and Pastore 1+ chip.  I'm used to seeing 22 lbs on full boost
> with my
> > > > Autometer boost gauge.  Now it reads more like 16 or 17 lbs,
> and
> > > > there are
> > > > some new boost-related noises coming from under the hood.
> > > >
> > > > Here's my main question:  If I'm missing 5 or 6 lbs of boost,
> is
> > > > that a big
> > > > enough leak to easily find when I pressurize the plenum with
> about
> > > > 10 or 15
> > > > lbs with my compressor?  Because I'm not hearing it.  I figured
> a 5
> > > > lb leak
> > > > would be easy to hear.
> > > >
> > > > Now I'm wondering if it's even a leak at all, or if it's the
> ECU
> > > > backing off
> > > > boost.  I pulled the codes by blinking them out.  Results are
> > > > inconsistent.
> > > > I've seen 2212 (throttle potentiometer), and 2111 (RPM sensor),
> > > > intermittently.  I've had no symptoms of problems with these. 
> I read
> > > > everything on Scott Mockrey's site, and ran the Motronic
> > > > diagnostics (which
> > > > includes the throttle pot), no problems.
> > > >
> > > > I've been chasing this issue for weeks now, and sometimes I see
> codes,
> > > > sometimes I get no codes at all.  I'm not convinced the
> spurious
> > > > codes are
> > > > even related to the low boost problem - for all I know the
> car's been
> > > > throwing codes a long time.  The car's running well, but not
> perfect.
> > > > Occasionally I get slight misfiring under full boost.  I've
> been
> > > > suspecting
> > > > a weak coil - but who knows.    16 lbs boost is way higher than
> > > > limp home
> > > > mode, so I don't know - can the ECU even be involved here?
> > > >
> > > > One more thing about the codes - I haven't seen any since I
> > > > replaced the
> > > > little rubber tee hose that connects the PCV to the underside
> of
> > > > the intake
> > > > - it was split wide open.  (I only picked up a pound or 2 of
> boost
> > > > after
> > > > fixing it.  But the boost needle doesn't flutter anymore).
> > > >
> > > > In general, the car pulls strong and smooth, but boost is low.
> > > >
> > > > So - boost leak, ECU backing off boost?  Or 3rd option - is a
> > > > failing turbo
> > > > a possibility?  There's a weird noise under there between 8 and
> 10
> > > > or 11 lbs
> > > > when under WOT.  I can't even describe it, but I pictured a
> split hose
> > > > making that noise.  There are no split hoses.  But the noise is
> > > > fairly new,
> > > > and it's only heard at WOT, when boost is building fast.  I
> hear
> > > > the turbo
> > > > whistle just like always.
> > > >
> > > >
> > > >
> > > > Thanks
> > > > Mike
> > >
> > > _______________________________________________
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