1988 Audi 90 Quattro

[Richard J. Andrews]

sounds like a bad fuel pup relay.
next time pop open the fuse box and feel the relay that you can put a fuse in.
This is the fuel pump relay. If so, replace it.
but when the tach drops to zero on the audi's it's usually ignition system,
but the fuel pup relay also does have controls for the ignition system

anyways, my bet's on bad fuel pump relay,

HTH!
rich
'86 4kq

-At 09:10 PM 3/15/02, you wrote:
-Help, please! My Audi has an awful problem - it is intermittently losing 
power, sometimes just
-totally losing power and leaving me stranded. -- snip -- I experience total
-engine failure. If I wait, the engine will eventually restart. And, run as 
if nothing is wrong.

this does indicate the relay cooling then working again. all or nothing 
kind of thing.