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1999 Pontiac Grand Am Catalytic Converter?

Tiny
SMVIEGAS
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
Our car makes a 'vibrating' noise. It is worse when the car is cold and just started. Once it warms up and is driven a bit, it lessens. We have had one person tell us that the entire manifold and catalytic converters needs to be replaced. However, after do ing a bit of research, I believe that the only thing that needs to be replaced are the catalytic converters. What are your suggestions?
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Monday, April 28th, 2008 AT 1:03 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
If what your describing is a metal on metal rattling or a soft rattling sound that goes away when you rev it up then it probably is a catalytic convertor problem or an exhaust heat shield problem.
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Monday, April 28th, 2008 AT 8:26 PM

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