Avant stalling

[Ingo D. Rautenberg]

Brandon,

Generally speaking, ISV failure on 3B motors is pretty rare (though their
relatively low production number may partly explain that).  A spirited run
with a defective bypass valve or plumbing followed by a rapid slow down to a
stop and stalled out engine is usually indicative of a faulty BPV IME.  Do
not overlook the small diameter hose from the BPV to the back of the intake
manifold -- original ones tend to deteriorate and so I suggest replacing
with silicone tubing available from various sources (I have red from WMB
dealer).

Simple check on whether or not the ISV is functioning properly would be
simply to unplug it and see if there is any change in idle or stalling.

HTH

-Ingo

----- Original Message ----- 
From: "Brandon Rogers" <brogers at terrix.com>
To: "200 20V List" <200q20V at audifans.com>
Sent: Friday, March 12, 2004 11:46 AM
Subject: Re: Avant stalling


I'm still not totally clear which symptoms point to BPV failure vs ISV
failure.

Any help appreciated.

TIA-

Brandon

  ----- Original Message ----- 
  From: Ben Swann
  To: Brandon Rogers
  Cc: TM ; 20020v at spymac.com ; 200q20v at audifans.com
  Sent: Friday, March 12, 2004 9:40 AM
  Subject: RE: Avant stalling


  I have not had any problems with my stock bypass and am running 2.5 bar
boost.

  I had the problem as you describe and it was remedied by repair/replace
the Idle Stabilizer Valve.

  I sa r/r because I cleaned the original ISV once and the problem resolved
for a time.  Cleaned it with throttle body cleaner.  Eventually I had to
replace it, and the  problem has not recurred.

  You may want to verify operation of both, or at least BPV since this is
the easier to test, before replacing anything.

  Ben

  [Date: Thu, 11 Mar 2004 12:41:01 -0500
  From: "TM" <t44tq at mindspring.com>
  Subject: RE: Avant stalling
  To: "'Brandon Rogers'" <brogers at terrix.com>, <20020v at spymac.com>,
  <200q20v at audifans.com>
  Message-ID: <002d01c40790$06318450$0400a8c0 at TAKA1>
  Content-Type: text/plain; charset="US-ASCII"

  Typical bypass valve failure creates the exact symptoms you describe-
  I've had two stock valves fail on me- the engine stalls when you cut
  the throttle and coast to a stop. Replacement of the valve fixed it
  every
  time. I'm running a Bailey, no problems since.

  Taka

  -----Original Message-----
  From: Brandon Rogers [mailto:brogers at terrix.com]
  Sent: Thursday, March 11, 2004 12:35 PM
  To: TM; 20020v at spymac.com; 200q20v at audifans.com
  Subject: Re: Avant stalling


  OK-why does it seem like the BPV, not the ISV?  Is it because the clutch
  is engaged and failing BPV causes compressor stall..then engine stall?
  And symptoms of a ISV failure would be pushing in the clutch and engine
  stalling instead of falling to idle?

  Thanks for the edumacatin'

  Brandon]

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