grinding sound in rain - '91 200q

["Gaidos, A." <agaidos@got.net>]

All,
 I was driving the '91 200q home in a heavy down poor doing about 55-60 mph
when I started hearing a grinding like sound from the driver's side front of
the car. It would come and go with no regularity. Everything seemed fine -
brakes worked, engine was running fine, etc..
 Once in a while it would start coming from the center of the engine
compartment too. This was very much out of the blue having never made such
sounds before so it may be something related to the rain? It seemed to
happen more when I lifted off the throttle and quite down when I'd get back
into it.
 I even switched the ABS on and off wondering if that was the problem. Every
odd.
Thanks
Anton J. Gaidos, III

1991 200 quattro 20 valve Turbo
1990 90 quattro 20 valve
1985 quattro Turbo Coupe - Top 26 of the Century?