Turbo problem, S4

[Kjell Arild Sandvik <sandvik@nwo.dec.com>]

Hi all,

Got into a problem the other day, and hope some of you out there can help me 
determine what to do. The car is a '93 S4 2,2 20V Turbo wagon. It has 70K 
Kilometers (43.5K miles) on the meter. 

What happened is that the turbo pressure suddenly "stabilized" itself on 1.1 
bar. :-( 
I don't know exactly when this happened, since I had the average fuel 
consumption on the display, and switched over to turbo pressure during a 
takeover. Then I noticed it. I couldn't make it go either up or down, regardless 
of rpm. It was 1.1 bar even on idle. A couple of times it also displayed 1.0 
bar. It feels like the turbo don't work at all, since there is noticeable less 
power at high revs.

Suspecting I could make things even worse using the car, I drove it to a Audi 
dealer that could look at it immediately yesterday. They took a readout of the 
error log. There where 5 errors logged (translated from Norwegian, might not be 
the correct English terms):

1. 65535
Control unit defective

2. 00519
Intake manifold pressure sensor-G71
Weak signal
Randomly occurring error

3. 00515
Hallgiver-G40 (the word means nothing to me, not translated)
Basic adjustment error
Randomly occurring error

4. 0519
Intake manifold pressure sensor-G71
Regulation difference
Randomly occurring error

5. 65535
Control unit defective
Randomly occurring error

The words HOHENESTER SPORT GAIMERSHEIM1 is printed on the top of the error log 
printout. I guess this is the company that made/mod'ed my chip??

After resetting the error log, the #1 error came back immediately, telling that 
the control unit is defective. As far as the dealer could tell, there were no 
leaking hoses. I think it sounds like the turbo is running, and the dealer 
agreed with that. They did not measure the actual turbo pressure. I didn't want 
them to do anything more at the moment, since I find them very expensive and not 
very skilled. They relaxed me saying chances of making any other damage by using 
the car was minimal.

An additional information; It has been extremely cold the last week, together 
with high air humidity. Temperatures from minus 17 to 23 degrees C in my area 
(1.4 to minus 9.5 Fahrenheit), and even then very slippery roads due to the 
humidity. Could this have anything to do with my problem? The car is parked 
outdoors. 

So, I would really appreciate it if anyone could tell me what to do now.... 

Freeeezing Thanx, 

--
/KAS               _\\|//_
                   ( O-O )
|---------------o00--(_)--00o-------------------------------------|
| Kjell Arild Sandvik      Digital Equipment Corporation, Norway  |
| Bamsemums MC #002     http://www.powertech.no/~morteas/bmc.htm  |
| DoD #4344                                                       |
| '93 Suzuki VS1400 Intruder                  '92 Honda CBR600F2  |
| '93 Audi S4 Avant                         "Cave ursem ferocem"  |
|-----------------------------------------------------------------|