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Old 06-28-2002, 11:02 AM
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csnow csnow is offline
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Join Date: May 2002
Location: Mass
Posts: 1,127
It would be a surprise to me if a cat failure would result in any noises. There are no moving parts in a cat.
Typical symptoms of a cat getting clogged is that the engine sort of 'hits a wall' where it just won't produce any power above a certain RPM.
My first thought would be that it has a loose and noisy heat shield on it. This can make a terrible racket, but it is usually easy to fix.
1986 300E 5-Speed 240k mi.
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