Audi just shuts off no warning while driving and won't

[Marc Boucher]

When I mentioned that the tachometer drops to zero, it was my way of saying 
that the car shut off.  My passenger described it as watching all the 
instruments go to zero, and I just tried to be a bit more precise since of 
course some of the instruments such as the speedometer would have glided to 
zero, and other such as the gas level would have been unchanged.  In short, 
the engine cut out very abruptly.

The multi-function temperature sensor which sends signals to the temperature 
gauge, has been behaving inconsistently during warm-up for a while.  But it 
does it rarely, and in this instance it had been working and the car was at 
full operating temperature and the needle was straight up.  The radiator 
temperature sensor and related relays had previously been verified to give 
the all the correct modes of operation (off, stage1 for AC, stage 2 for heat 
or if ac high-pressure trips, stage 3 for extreme heat).



--------------------------------------------------
From: <TWFAUST at aol.com>
Sent: Saturday, August 13, 2011 8:41 PM
To: <quattro at audifans.com>
Subject: Re: Audi just shuts off no warning while driving and won't

> I am not sure whether I read your note correctly. When the "tachometer
> drops to zero", is the motor still running? I realize that a '90 100 has a
> distributor, but for what it is worth, the ignition module on my car is
> failing.  As part of the ongoing failure, the car will drop a few 
> cylinders and the
> "tachometer will fall to zero". I think my suggestion is that you
> investigate  the electronics before they get to the tachometer sender/pick 
> up.
>
> I am puzzled by trouble with the temperature gauge. Are there any other
> electrical anomalies? Could there be a common source?
>
> Tom Faust
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