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2004 chevrolet tahoe v8 has a rattling noise metal in a coffee can?

(2004 Chevrolet Tahoe)
in San Diego, CA on March 30, 2013
2004 chevy tahoe v8 z71 has on the underside middle front of car a rattling noise at low speeds during acceleration. Sounds more like a piece of metal rolling in a coffee can. Its a metal clanking sound like loose piece of metal inside some metal compartment. I cannot see any loose heat shields or loose bushings. Read about something with an O2 sensor does not make sense. Someone suggested possibly the catylitic converter honeycomb breaks down causing a rattling metal clanking sound. Has anyone heard of this issue or any suggestions as to what is causing this?
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Popular Answer
on March 31, 2013
if it isnt a loose heat shield then try hitting the converter with a rubber hammer to see if you can get it to rattle
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