Miata Mailing List: March 1995, Message #87
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   From: "Jyri J. Virkki" 
Subject: rattling, heat shield?
   Date: Wed, 1 Mar 1995 23:26:22 -0500


Hello all,

Well after some 24K miles my Miata quite suddenly developed a very
loud, metallic rattle.  From the traffic on this list I believe it
must be the infamous heat shield.  It occurrs at almost exactly
3500rpm, nowhere else.  And while it is a very hard sound to place, to
the best of my guess it seems to come from the general area of the
down pipe so that fits too.  I haven't looked much into it, just too
cold out there still!! ;-( Anyway, what's the best way to approach the
problem, remove the shield or what?  I seem to recall the culprit is
the shield of the downpipe, not the header shield or the ones furher
down, correct?

BTW, it's interesting to note that I find it impossible to replicate
the rattle in my garage!  When driving, it will never fail to rattle
@3500rpm.  It's not speed dependent either, since I can always produce
it by revving up to 3.5K while stopped at a light or whatever.  Once I
get in the garage however... nothing.  Almost as if it knew that at
that moment I can try to pinpoint the source, so it decides not to
make any noise!  Weird. 

-- 
Jyri J. Virkki - Linux: Choice of a GNU Generation - DoD#0561