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ISV sticking? Try cleaning the electrical plug first.
Here's an interesting observation: the ISV on my '90 CQ was causing one
of the usual dying/sticking symptoms of crummy transition on/off
throttle at low speed.
To confirm that it wasn't something else (how could that be, one asks,
given the simplicity of our beloved Audis?), I unplugged it for my
morning commute through Boston rush hour traffic. On/off throttle
transition problems went away, saying that the ISV was the culprit, but
lousy idle speed (what a surprise) was a problem. I plugged the ISV back
in when I got to work, knowing I'd have to stop on the way home to get
some carb cleaner to bathe the ISV in.
The ride home was my turn for a visit from the Audi Gods. The on/off
throttle lurching went away! The idle speed was rock steady! Seems a
little loving attention to the ISV, like unplugging and the re-plugging,
may be enough to solve my problem! It has so far, X X (that's crossed
fingers on *both* hands).
Ian Duff, New Bedford, MA, USA
1990 Coupe Quattro 20v