Help ! no spark!

[Conci Stelian]

Hello!
I have a big problem: intermitent no spark.
Now the engine start...after a few hours no start.
Distribuitor new!
Rotor new!
Ignition coil tested > OK!
Ignition wires NEW!
Hall senzor tested OK!
I have consulted the archives....please tell me where is located the
"Engine Speed sensor"????
Today I will try to get the error cods.
Any sugestions are welcome!
Thanx in advance!

Audi 90 Quattro 20v 1990 (Hitachi unit)

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Best regards,
 Conci                          mailto:concistelian at home.ro

!KViST!