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

[Huw Powell]

The tach is counting spark from the coil.

No spark, tach reads zero, whether the engine is still spinning or not.

On 8/14/2011 4:11 PM, Marc Boucher wrote:
> 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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