Miata Mailing List: July 1995, Message #141
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   From: a.mccombs3@genie.geis.com
Subject: Re: Exhaust vibration
   Date: Wed, 5 Jul 1995 18:20:37 -0400

Well, Kansei recently encountered the Dread Heat Shield Rattle.  Exhaust
system would buzz at around 4100 to 4400 rpm (this seems to be a resonant
rpm range for the exhaust anyway).  I took a look under the car today,
pounded, tapped, and shook everything, and the only thing I noticed which
was out of the ordinary was a small rock protruding from one of the vent
holes on the bottom of the cat. converter heat shield.  I pried it out (and
pried the shield further away from the cat. converter, where speed bumps had
pushed it up a bit), and voila, no more vibration.  EZ fix, if your heat
shields in other locations are in good shape and not causing the problem.
 
                                                --Jack M. & KANSEi--