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2004 Mercury Marquis how to determine if catalytic converte

Tiny
PLAD2CARPROS
  • MEMBER
  • 2004 MERCURY MARQUIS
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)
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Wednesday, November 4th, 2009 AT 4:51 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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)
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Thursday, November 5th, 2009 AT 12:02 AM

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