weird high pitch pinging noise?

[spdracer@mail.utexas.edu]

After sifting throught the archives the past half hour or so, I'm starting to
think it's detonation.... but why would it be detonating at idle?  Running 93
octane gas, have a front mount IC, and it's not hot outside (upper 70's)though
it is really humid.  And it randomly happens around 10-20 seconds or so.  It's
not totally consistent.  When I change the oil, I'm going to check the turbo
shaft for any play.  It's the only easy thing to check right now that I can
think of.  Hmm... guess I'll check the plugs too.

> Spun bearings have always sounds like a low deep knocking noise to me.
> Doubt this is what you are hearing.
> Dave

> > I got home from a drive tonight and noticed a weird metallic high
> pitch> pinging> > noise that hadn't been there before as I was pulling into my
parking> space.