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2001 Pontiac Grand Prix Deposits In Catalytic Converter

Tiny
HSSHAPIRO
  • MEMBER
  • 2001 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
I just had my catalytic converter replaced because it went out. In reviewing the converter, there were metallic deposits in the converter that caused the issue. The deposits looked bronze or brass. Does anyone know where the deposits may have come from in the engine?
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Sunday, November 15th, 2009 AT 3:30 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Was the engine pinging before the CAT replacement?

Did you gradually loose performance or did it happen all of a sudden?
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Monday, November 16th, 2009 AT 8:58 AM
Tiny
HSSHAPIRO
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  • 2 POSTS
It happened all of a sudden. One night leaving work, the power was gone. Really bizarre.
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Wednesday, November 18th, 2009 AT 10:18 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
If engine is running normally now, it may have simply been some spark plug material in convertor.
A plug tip broke off for example, or O2 sensor material.

Convertors generally fail when air/fuel ratio is too lean or rich, or the convertor is impacted with road debris.
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Thursday, November 19th, 2009 AT 8:03 AM

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