[s-cars] Boost problem

[Kirby Smith]

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:
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> 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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