[urq] intermittent ignition cutout, tach drops to zero

[fdekat]

I too had such a similar problem on my '83 urq.

I've not really 'solved' the problem, but have managed to make the symptoms
go away.

I would get the same tach action, or sometimes it would bounce all over the
place. And if the 'event' happened under good boost, I'd get a most
spectacular loud 'BANG' out the rear. Sort of fun, the first few times. Gets
pretty tired after a while.

Anyway, if it didn't fix itself, it could be cured by a key off/on cycle
(even 'on the fly' on the highway).

Eventually, it started to happen when hitting good bumps, and I could
'simulate' the condition by beating on the right end of the dash. I've
'fixed' it by mounting the ECU back onto the glovebox end, as it was intended
to be. 

(When I got the car, the ecu was sort of hanging on the end of a tiewrap, up
behind the glovebox.)

I was convinced that it was a flaky connection, but no amount of prodding at
the ECU connector, or moving it around could reproduce the fault. I'm
thinking that perhaps something on the ECU itself is the problem, but have
not really pursued the issue further, as it 'seems' to be ok now. 

(OK. So I'm an optimist! Who am I really fooling? The Audi gods will strike
when they see fit!)

Regards,

  =Frank de Kat=