[s-cars] Boost problem - Reading fault codes

[chris chambers]

Tue,

This site tells you how to read the fault codes for all Audi S4/S6 from
1992-1996.

http://www.sjmautotechnik.com/20vcodes.htm

It is easily done, and can provide alot of valuable informaiton on what
may be causing your problem.

HTH
Chris


--- Kirby Smith <kirby.a.smith at verizon.net> wrote:
> The computer is backing off the boost because the computer detects a
> problem.  Reseting the computer by restarting the car allows it to
> try
> for full boost again until the problem occurs.  The question is: What
> is
> the problem it detects.  One possibility is low octane gasoline
> causing
> detonation.  Another is a loose detonation (knock) sensor giving
> false
> readings.  There may be many other causes others on this list could
> better describe.  However, in US cars, at least, Audi provides a
> means
> of finding out what the computer is complaining about.  There is an
> interface to the computer that allows one to find out what trouble
> code(s) have been set by the computer.  I do not know about your car
> in
> particular, but I believe 95.5 cars have the interface somewhere next
> to
> the hand brake.
>
> I also do not know if you can get the codes to show up as a flashing
> light on the dash, as my 95 can, or whether only another computer can
> read them.  You need to find an Audi mechanic who has a suitable
> device
> and a list of the codes and their interpretation.
>
> kirby
>
>
> Tue wrote:
> >
> > This is a multi-part message in MIME format.
> > --
> > [ Picked text/plain from multipart/alternative ]
> > So many problem with my UrS6 (year 95.5)that really get me sick of
> it. First the front shock follow by the ignition coil was bad, the
> fuel pump dead. Now the latest symptom is the motor could run smooth
> from the first start and had shown nothing wrong drive out with very
> powerful, It gone all the way up to 2.1(The stock boost pressure on
> the computer) suddenly its lost the boost to 1.5 then no more boost
> can go up to the same level again till stop the engine and restart
> then I can boost up to 2.1 once more. Any one had a clue where should
> I start with. It seems to me that the ECU tells the waste gate to
> control the boost pressure but it wouldn't stop and back to the
> normal state.
> >
> > Many thanks in advance.
> >
> > SS
> > --
> >
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=====
93 Audi S4 silver, 93 Audi S4 black, 85 VW Scirocco 2.0 not stock :-)
73 Porsche 914 2.0 (67,000 original miles, stock), 67 GMC Long Step pickup 95% complete frame off restoration, 86 VW Scirocco Wolfsburg

"If things seem really under control, you're not going fast enough.  -
Mario Andretti"

"It's not how much you make, but how much you don't spend!"

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