Re: Octane vs. carbon buildup?

["Milan B. Milojevic" <milanb@earthlink.net>]

I tend to agree with your assessment but there must have been lot more 
incidences than what we see here if Audi issued a Technical Bulletin.  At 
least it must have shown a spike on their statistical analysis of 
problems.  As far as "external causes" I also have no clue.  Of course the 
latest recall of TT for loss of control in "extreme" conditions makes me 
wonder how much testing goes on particularly with the fuel changes in 
US.  Again, my paranoia may be showing.:)

At 02:05 PM 10/20/99 -0700, you wrote:
>Milan B. Milojevic writes:
> > The later may be more accurate.  Audi knew of the carbon build up as early
> > as March 1996 when they issued a Technical Bulletin regarding the
> > problem.  I bought my A6 in July 1996.  Interesting thing is that there 
> are
> > literally millions of cars on the road that do not suffer aforementioned
> > problem, and the A6 engine is not stressed at all within the parameters
> > they work with.  In my opinion Audi is counting on most of their customers
> > being ignorant and insensitive to unexplained noises.  Than the 
> warranty is
> > over and it is your baby now.  In all fairness to Audi, I have heard that
> > they have picked up tabs on carbon removal with vehicles way out of
> > warranty period.
>
>Your engine is the venerable 2.8 V6 12-valve used in not just your
>model year A6 but all 96-97 A4 2.8, 1995-97 A6, 1992-94 100,
>1993-95 90 and all US Cabriolet cars.  If there is a real design
>issue with this engine we would hear much more about it on this list,
>and most people on this list are certainly not ignorant about their cars.
>It's more likely some external factor that causes some engines to
>experience the problem but not others.  What is it?  I have no clue.
>
>-Ti
>96 A4 2.8 quattro (with the same engine, but no carbon buildup)
>84 5000S 2.1 turbo
>80 4000 2.0
>--
>     ///  Ti Kan                Vorsprung durch Technik
>    ///   AMB Research Laboratories, Sunnyvale, CA. USA
>   ///    ti@amb.org
>  //////  http://metalab.unc.edu/tkan/
>///