[s-cars] Boost leak help!

[Chad Frederick]

> Did you remove and plug the breather hose when you pressurized
> the system?

Ah Dan,
We for that step.  We will disconnect the breather hose tommarrow and try it
again.  I know that no damage was done since your car still makes boost.
But the leak still should of still made itself apparent.

This is like the same exact problem Stacy's buddy Dave is having with his
green urS.

Chad




> Dan -
>
> Here's the list of things to test:
>
> http://www.sjmautotechnik.com/20vboost.html#chklist
>
> Did you remove and plug the breather hose when you pressurized
> the system? If not, that could cause the leakage around the
> oil cap (and possibly cause some seal issues)
>
> Steve Powers
> 95.5 Avant
> Seattle
>
> >  -----Original Message-----
> >  From: s-car-list-admin at audifans.com
> >  [mailto:s-car-list-admin at audifans.com] On Behalf Of Daniel Hussey
> >  Sent: Friday, August 08, 2003 12:49 AM
> >  To: s-car-list at audifans.com
> >  Subject: [s-cars] Boost leak help!
> >
> >
> >  This is a multi-part message in MIME format.
> >  --
> >  [ Picked text/plain from multipart/alternative ]
> >  Ok, I'm having some trouble with a boost or vaccum system
> >  leak and can't seem to find the source.
> >
> >  Here's the rundown...  car is a 1995 Audi S6 Avant.  Never
> >  had any problems, car ran great, but started noticing loss
> >  of some boost power after installing a TAP 2.5 bar chipset
> >  and AutoMeter boost guage.  Car was only pulling 10 psi,
> >  then it petered out and you heard rushing air.  Otherwise,
> >  the car drove fine and under normal conditions you would not
> >  notice any problems.  So, I figured I had a split in my
> >  lower boost hoses somewhere.  So, I ordered a Samco Michelin
> >  man hose (everyone was out of stock on the turbo to
> >  cross-over pipe one at the time).
> >
> >  Anyways, without replacing any hoses (while waiting for my
> >  Samco to arrive), the problem seemed to go away!  I was
> >  pulling 15-16 lbs of boost normally (which seemed about
> >  right for a 2.5 bar sensor car and stock position of the
> >  wastegate spring).  No rushing air sound.  Car drove great.
> >
> >  Then, all of a sudden last week, the problem came back.
> >  Same symptoms.  Car pulls a good 10 psi, then I hear air
> >  rushing out and that's as much boost as it can pull.  So, I
> >  decided to actually replace my cross-over to IC hose with
> >  the Samco unit.  Nope, problem still there.  I inspected all
> >  other boost hoses carefully (including the one I pulled off
> >  when I replaced it).  All in great shape.
> >
> >  So, next step, I pressurized the entire intake system to
> >  15-20 psi.  At about 10 psi the only air I could hear
> >  rushing out was through the oil cap...  it was loud too!
> >
> >  Is this normal?  Should the oil cap let air pass through?
> >  I've never heard of this as a source of boost leaks, but I'm
> >  wondering if anyone else found this to be a pressure leak
> >  causing low boost?
> >
> >  BTW, I have also replaced the bypass valve with an upgraded
> >  unit (993TT factory part), and replaced the lead hose with
> >  Gates fuel hose with good hose clamps, and car pulls no codes.
> >
> >  Any ideas???  Should I replace the oil cap?  And, if this is
> >  not my source of air leak, where else should I be looking?
> >  I think I've been checking all the obvious places.
> >
> >  Thanks,
> >  Dan
> >  '95 S6 Avant (factory "Sport" suspension)
> >  '87 Jeep Cherokee 4x4 (aka "Ski Bitch")
> >  Seattle, WA
> >
> >  --
> >
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> >
>
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