Strange buzz/hum

[shilling@txchemcouncil.com (Mark Shilling)]

This is too much, almost 50k with no more than regular maintenence and a
broken signal stalk, and now every seems to be happening at once...

Now I am noticing a strange buzzing/humming noise, the closest I can locate
it is between the gas tank and the back seat, although I suspect its
probably underneath the car, in that general area. Sounds very similar to
the buzz you get for opening a door with the car in gear (automatic at
least), only a little higher-pitched and not nearly as loud.

Anybody have any ideas about this one? Or have I just become paranoid?
Sound is the same regardless of gear or motion, and with accessories on or
off, engine hot or cold.

TIA

Mark Shilling
shilling@txchemcouncil.com

'81 4k 4e (gone but not forgotten)
'82 4k 5+5 (gone and definitely forgotten)
'90 80 2.0 (thankful for honest mechanics)