2002 Chevy Trailblazer Sudden change in smoothness

Tiny
BHOLLIS
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
My 02 Trailblazer suddenly changed in how smooth it drives overnight meaning that now it sounds a bit like a lawn mower. When you are inside the car, lite vibrations can be felt through the floor on your feet. When you are outside of the car, it seems that the noise is coming from the exhaust pipe. I took it to a mechanic and they said there was nothing wrong with the muffler. They apparently did a back flow test. I just don't think they tried hard enough. Any ideas as to what could be wrong?
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Tuesday, February 5th, 2008 AT 10:46 AM

3 Replies

Tiny
JACK42
  • MEMBER
Has the check engine light come on while it is running? If so it needs to be scanned for codes. Does it feel like the engine is running rough or it feels rough when moving?
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Tuesday, February 5th, 2008 AT 2:50 PM
Tiny
BHOLLIS
  • MEMBER
No, the check engine light has never come on. The engine was checked by the mechanic anyway and he said all was fine. I would say that the noise from the tailpipe and slight vibration are both present when the car is idling but they both get worse as the car moves. Speeds from 25 to 40 MPH is when it is the worst.
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Tuesday, February 5th, 2008 AT 3:02 PM
Tiny
JACK42
  • MEMBER
Not sure what you are feeling that does it at idle and worse at 45 when the engine isnt missing. Has the exhaust system been inspected?
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Tuesday, February 5th, 2008 AT 3:19 PM

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