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Orange light comes on...Help

In message <> Vytautas Reipa writes:
> Whenever my 86 5kcst(103k miles) hits 3k rpm under full-throttle
> acceleration, the orange light on the dashboard comes on. This light,
> according to my owners manual means that the octane rating for the fuel is
> too low or there is a problem with the ignition system. The ignition works
> fine on my car ...

No, it doesn't.  That's what the light is saying.
To work out exactly what it means, you need to dump the error codes out of the 
ECU and look them up in the tables Audi provide.  This is a fiddly procedure,
but quite easy to follow if you have the instructions.
On the ur-quattro "MB" engine, there are 12 reasons why this light can come on 
- on the later 20V "RR" engine, there are around 50 reasons.

I've done a version of the instructions for the "MB" engine.  Perhaps someone 
with access to the 86 5kcst engine documentation could modify it and post it 
for you?  It's probably pretty similar.
If someone would like to email me, I'll send a copy of the ur-quattro version 
for use as a skeleton.  It's 4.5KB, 122 lines.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club