bap

have started to notice a rattling noise upon acceleration from dead stop but only when engine is hot and only upon initial acceleration (as in leaving a fast food drive through window). don't hear it when just revving the engine. wondering if it could be catalytic converter. car is 2000 model with 95K miles

HotZ28

Would a better description of this noise be; it sounds like someone shaking a can with BB's in it?

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bap

not the typical catalytic converter bb's in a can sound. more like metal flashing vibrating against other metal. thanks for any advice

HotZ28

Have you checked the heat shield above the cat, and how about the harmonic balancer? The balancer usually makes a hammering sound, may not be the case here! Have you ever had any type of transaxle service?

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rustbucket

There may be a heat shield above the muffler too. I see one edge of mine is rusted off.

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Daily Driver: 2008 Chevy Impala - 30000 mi
Others:1993 Chevy S10 - 85000 mi, 2000 Saturn SL2, 1987 Buick Lesabre RIP, 1999 Buick Lesabre