2004 Mercury Marquis how to determine if catalytic converte

2004 MERCURY MARQUIS
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PLAD2CARPROS
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Noises problem
2004 Mercury Marquis V8 Two Wheel Drive Automatic 99k miles

in an earlier post and reply it was suggested i bang the converter with a rubber mallet to see if the heat shiled is loose vs the converter being bad - stupid question but once i do this how do i interpret the sound (i hear a slight buzzing or tinging after i bang on it)
Nov 4, 2009 at 4:51 PM
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MHPAUTOS
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Hi there,

Yes this is a bit difficult to determine, normally a heat shield will be a tinny sound and a failed core of the converter if broken away will be a more solid rattle, as the core is of a honeycomb construction it will break up into sizable lumps and this will give a heavier sounding rattle

mark (mhpautos)
Nov 5, 2009 at 12:02 AM