Miata Mailing List: August 1992, Message #36
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   From: (none)
Subject: Factory Defects (was RE: suspension promblems)
   Date: (none)

It might be interesting to come up with a list of problems officially
noticed by Mazda, or perhaps anything fixed under warranty for
everybody on the list.

On this subject, I have been have trouble with the factory exhaust
system.  Specifically, a nasty buzzing at 3300-3500 rpm.  Dealer #1
insisted it was the muffler (I was dubious), replaced it under
warranty, and the noise was still there.  At that point I did some
crawling around and tracked it to what looks like a heat guard in the
form of a sleeve wrapped around the exhaust pipe as it descends from
the engine.  I pointed this out to dealer #2 (which had bought out
dealer #1 in the mean time), who stated that no, it was actually the
muffler that needed replacing (sound familiar?).  I bowed to their
superior knowledge, had the _3rd_ muffler (since new) installed on
the car, and the problem is still there.  I have yet to go back again.
If anyone else has had this problem and has discovered what exactly is
causing it and what the fix is, I'd be really happy to hear from you.

Gordon.