Cadillac CTS weird grinding/metallic noise under car

Tiny
KEVINRW28
  • MEMBER
  • 2006 CADILLAC CTS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
Alright so I have a 2006 Cadillac CTS which has 128,000 miles on it. I've recently bought it from a dealership around 1 week ago and I've been hearing this grinding/metallic/vibrant noise that is coming from under my car. It only happens when the car gets warmed up and if you accelerate after 1750 RPM. You can sometimes hear when put in neutral and park. I've used my neighbors lift that he has to check if it was a heat shield problem but couldn't find any of them that are loose. I'm not sure if it can be something in the catalytic converter, muffler, transmission or even the engine. Oil has been recently changed, but the transmission says its 41% life remaining.
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Thursday, April 3rd, 2014 AT 1:04 PM

3 Replies

Tiny
KNOWLEDGE IS POWER
  • EXPERT
If you can't find a heatshield that's loose, then I definitely say you probably have a catalytic converter that maybe separating. Does the car run okay? If the catalytic converter separates, the car will not run well. I tried to get a shop to put it on a lift for you so that you can look underneath the car properly to tell what making the noise
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Thursday, April 3rd, 2014 AT 2:42 PM
Tiny
KEVINRW28
  • MEMBER
I just went to a friends house who has a lift and found on there was something loose inside the catalytic converter. It seems to run fine though.
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Thursday, April 3rd, 2014 AT 3:20 PM
Tiny
KNOWLEDGE IS POWER
  • EXPERT
If what's loose is inside the catalytic converter and it runs fine then drive it. But be warned, it won't be long before you'll need to replace that catalytic converter
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Friday, April 4th, 2014 AT 2:49 PM

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