>>
>> Where is the ECU ?
>
> On a 164 I'm afraid I have no idea
>
>> & how much is that to replace ?
>>
>
> See above. When I said 'ecu related' I meant to imply that the reason the
> spark is not happening could be a simple electrical issue that is
> preventing the spark from happening (bad connection on the LT side of the
> coil for example) or, (and this will be much harder to track) that some
> kind of sensor fault is making the ECU 'decide' there is no need to spark.
> Or the ECU could be dead. Not really much more I can do to help. ISTR
> that the manuals are available for download on the web, but you may have
> to do some hunting.


May not be of any help but my Renault had the same/similar problem.
Turned out to be the Crank Position Sensor. This was stopping the spark as
the ECU didn't know WHEN to spark.