water in ECU

[Q]

Water causes the corrosion but it will also evaporate with heat.
In the tube days we would use soap and water to clean the oily dust off
of radio and amplifier parts, the tubes resistors and capacitors.  Then
stick the unit into an oven at about 150 to 200 for several hours.

I've done that with S4 ECUs just be careful of the relay. And keep the
heat around 150.

Ned

-----Original Message-----
From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com] On
Behalf Of Nicholas Lawrence
Sent: Wednesday, May 29, 2002 5:16 PM
To: Audi (E-mail)
Subject: water in ECU

    Car is a '90 200 TQA.  Tuesday it wouldn't start during a rain
shower.
Didn't connect at the time because it has had difficulty starting
before.
Later in the day it started right away and I began driving. I noticed
the
digital guage did not match the mechanical boost guage and it began to
read
higher and higher.
    It stopped running and while I was waiting on rescue I removed trim
cover to see ECU.  It had a plastic bag around the wires and a large
amount
of water sitting on the connector. I dried it off and drove home,
digital
guage still climbing.
    I removed the ECU and opened it up to find water and small amount of
corrosion  one chip's pins. I'm cleaning it up with contact cleaner and
a
brush. Haven't reinstalled yet.
    So... any experience with this problem?  First I'll attempt to track
down source of water leak.
    What is the likely hood of permanent damage to the ECU?
TIA
Nick