Is it a sickness??

[Huw Powell]

> My 90 Quattro has been running really well- 

[what year?]

> I also cleaned out the ISV and tightened up the connector prongs which 
> were a bit loose. While I was doing this I noticed the insulation has 
> burnt off the wire that comes out of the vacuum diaphragm that is 
> mounted on the firewall.

What does it go to?

> I found another burnt wire 
> under the dash, it goes back to a control box / relay with the part 
> number: 443 907 393M, I am not sure if it is the same wire or not. Does 
> anyone know what that relates to?

according to http://www.humanspeakers.com/audi/relays.htm it is probably 
the idle stabilization relay...

I agree that fixing these corroded/burnt wires is probably a good idea. 
  If you happen to have the Bentley shop manual for the car it might 
help you trace these circuits from beginning to end.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/