bucking above 1.1 bar, max boost 1.3

Charles Baer Charlie at DCSi.com
Mon Feb 25 16:02:29 EST 2002

Methinks we are beginning to see some correlation here:

The Avant I bought two weeks ago had just been washed when I
went for the test drive where bucking hit hard at 1.3bar.  The
ECU also reported an overboost code (2224 I think, no notes here)
My sedan just plain died when driving in a massive downpour
(1"+ standing water on the crowned higway).

Not to say other causes don't exist, but this seems far too
coincidental to dismiss.  I trailered the Avant to Boulder from
Fort Collins in a high wind that may have helped dry out the
moisture that was(maybe) causing the problem.  Did some trivial
fiddling that night then drove to Georgetown and back the next
day with no apparent problems other than the BPV.


> -----Original Message-----
> From: Jeff.Bernstein at pneumaticscale.com
> [mailto:Jeff.Bernstein at pneumaticscale.com]
> Sent: Monday, February 25, 2002 11:39 AM
> To: malth at umich.edu
> Cc: 200q20v at audifans.com
> Subject: RE: bucking above 1.1 bar, max boost 1.3
> Chris,
> I am completely convinced that the steam cleaning was the cause of the
> problem.  I have cleaned my engine twice and have had exactly the same
> problem both times.  It is a pretty violent bucking as compared to MAF
> sensor problems which I have also experienced.
> I have not cleaned my engine for a long time due to this
> exact problem.  I
> plan to try cleaning it this spring and I am going to go to
> extremes to keep
> the distributor dry and see if this is the source of the problem.
> I don't think you will have any more trouble with the bucking since it
> usually took several days of driving and then the problem
> would disappear as
> mysteriously as it appeared.
> Jeff Bernstein
> -----Original Message-----
> From: Chris Covington [mailto:malth at umich.edu]
> Sent: Monday, February 25, 2002 1:06 PM
> To: Jeff.Bernstein at pneumaticscale.com
> Cc: 200q20v at audifans.com
> Subject: Re: bucking above 1.1 bar, max boost 1.3
> Jeff,
> Yes I did steam clean the engine on Thursday.  It was a
> little rough on
> Friday with similar symptoms, but I also drove 400 miles this
> weekend and
> didn't experience anything Saturday on the first leg of the trip.
> So I thought all the moisture would've gotten out of the system.
> Today the problem was completely gone, 1.8 bar, no hesitation, which
> leads me to definitely think the problem is electrical of
> some sort.  All
> the hoses, including that Michelin man are fine.  If it
> remains fine I'll
> assume it was moisture.>

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