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Re: 92 100CS oil pressure warning - Auto System Check

To:   quattro

I have a printed TSB that I can fax to you, it's entitled, "Dynamic Oil
Pressure System - Troubleshooting tips"

It contains some helpful tips and possible causes for the oil pressure
light illumination. It appears that there are 2 switches, a low pressure
and a high pressure switch. The low pressure switch is checked below 2k
rpm, and the high pressure switch is checked above 2k rpm (I guess there's
no check right at 2k ;->), and one of them could be bad. Do you recall if
the warning is consistently above or below 2k rpm?

Other causes could be diluted or contaminated oil (doubtful in your case),
a defective oil pump or pressure relief valve, or, get this, "mechanical
engine problems". Sure, that's vague enough.

In comparison to my car, your idle oil pressure is lower than mine; I seem
to hover just around 2 bar, maybe a bit higher, and any bit of throttle
sends it directly to 5 bar or pegs it.

Anyway, send me a fax number and the tsb is yours.

Sean Ford
'92 Audi 100CS 5-spd 36k mi (getting redline tranny oil tomorrow. Yaaaay!)

Original Message----------------
Date: Wed, 06 May 1998 20:58:48 -0400
From: Scott 20191668 Bermes <scottb2460@earthlink.net>
>Well, if it ain't one thing it's another!  The oil pressure warning on
>my auto check display keeps going off ever since I ran over a blown tire
>tred last month. I took it to the dealer who fixed the engine cover
>under the car, checked the oil level and everything looked ok, but they
>couldn't replicate the warning.
>Last week, the dealer changed the oil on Friday and everthing was fine
>(including a 350 mile drive) until yesterday. Now the warning is going
>off quite a bit. The gague reading is almost at the top reading
>(4.8?)when I am driving and around 1.5-1.8 when stopped.  I am taking it
>to the dealer tomorrow and wanted to know what you all think about what
>they might say.
Are there sensors under the engine which could have been effected by
running over the tire treds?  The manual says to not drive the car when
the warning comes on, but I have driven over 100 miles since the warning
started yesterday.  Appreciate any info.