Humming/roaring

2007 PONTIAC GRAND PRIX
209,338 MILES • 3.8L • 6 CYL • 2WD • AUTOMATIC
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LUCKY86BAMA
  • MEMBER
  • 2 POSTS
When accelerating and let off the noise get louder but when turning it almost stops.
Dec 14, 2019 at 9:41 AM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
More than likely this is a wheel bearing or another bearing. By turning you are loading and unloading the bearing and the fact that it makes the noise when accelerating and decelerating, I suspect it is a bearing in the differential. However, the wheel bearings are easiest to check so I would start with those.

https://www.2carpros.com/articles/how-to-replace-front-wheel-bearings-and-seals

https://www.2carpros.com/articles/car-howling-noise
Dec 14, 2019 at 6:20 PM
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