Some of you may have experienced this.  The 84GL doesn't do it when I am
trying to listen for the thump.  When I start it (maybe 40% of the time), I
get a single thump and sometimes two thumps.  Everything starts fine and the
van runs pretty good.  I am trying to attack some problems still remaining.
There doesn't seem to be anything loose but I have been wrong on that before
(and found a bolt or something missing on a bracket).  What it sounds like
is maybe the motor mount is bouncing (for lack of better words to describe
it).  There does not appear to be hard metal contact (like slamming two bars
together) but it is more like two pieces of metal banging together through a
piece of rubber.  Could the starter be causing this problem?

William