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Re: Quattro Digest V2 #665

        Reply to:   RE>Quattro Digest V2 #665

Please remove my name from list.Thank you.

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Date: 12/30/95 1:14 PM
To: Marc Halman
From: quattro@coimbra.ans.net
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Quattro Digest           Saturday, 30 December 1995     Volume 02 : Number 665

In this issue:

	Re: V8 surge problems
	Re: V8 surge problems
	A "Q" Survey
	Air Filter & Toys
	stiffer valve springs
	Changing air filter on 2.0l Audi 80
	stiffer valve springs
	Re: stiffer valve springs
	Re: V8 O2 placement
	Re: stiffer valve springs
	Stages and Theatrix
	High Speed Noise
	Computer / Reset Switch
	Re: help! CV joint repair question
	A4 - Automobile Mag All Star
	Re: Stages and Theatrix
	Audi 80 2.6
	Audi 80 2.6E
	Tranny noise -- part X
	Seat Heater lights
	Re: interior fan going dead

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From: Randall Markarian <asenna@mtvernon1.accessus.net>
Date: Fri, 29 Dec 1995 20:40:12 -0600
Subject: Re: V8 surge problems

Eliot Lim wrote:
> 
> > Today I took my 90 V8 to the dealer for a repair, it is also due for
> > its 90K service so I asked about the Ox sensor because I have
> > noticed the same exact symptoms that you have described.  They
> > explained that a bad Ox sensor would cause surging only at idle.
> > Therefore, this could not be the cause of the problem.  I tend to
> > believe them, because have you ever heard of a dealer *not* wanting
> > to perform a service!
> 
> the reason for this is because there are no official audi factory
> bulletins advising them of the problem.  if they went ahead and
> changed the OXS and did not fix the problem then they would be
> up s*** creek wouldn't they?
> 
> >  They explained that this problem is inherent
> > to the V8 and something that they have narrowed down to a
> > transmission software problem.  Since my car has the original
> > transmission software, possibly that could help?  Eliot might shed
> > some light on that.
> 
> that is crazy.  how could the software cause the surge?  the torque
> convertor is a fully mechanical device.. the electronics do nothing
> more than make shifting decisions.  this problem has nothing to do
> with shifting decisions.
> 
> my car had the problem before and after a complete transmission
> and transmission control unit swap.  the problem disappeared when
> the OXS was replaced.. it is pretty conclusive as far as i'm
> concerned.
> 
> if you looked at the exhaust layout of the V8 it is pretty nutty.
> the pipes coming in from each of the bank meet in a "H".  the OXS
> sits right on the horizontal bar of the "H".  most of the exhaust
> gases just go straight through the "vertical bars".  that's why
> the OXS is doing such a poor job.
> 
Sorry, I was just relaying the information that the dealership 
provided.  But, I did not say that it was absolutely correct or that 
I totally agree with it.  It was food for thought.  Still, I can 
agree with what they told me, that there is so much going on with 
the engine during acceleration (info from all sensors etc.) that it 
could be naive to think that the Ox sensor would correct the problem 
each and every time on every car.  When my V8 had its 60K service, 
it had surging before and after the service even though the sensor 
was replaced!  Either Audi happenned upon a really lousy design for 
the Ox sensor(possible), or it could be a multifactoral problem.

Also, I requested the Ox sensor change and they warned against it 
because it might not work, they had nothing to lose (and money to 
gain) by honoring my request.  Note also, the 92 or later V8's have 
not had this problem(according to the dealer).  Did they 
redesign/relocate the Ox sensor fo