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1999 Pontiac Grand Prix wheel bearing

Tiny
USAF_FF43
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
Tires and Wheels problem
1999 Pontiac Grand Prix 6 cyl Two Wheel Drive Automatic 124, xx miles

I replaced both wheel bearings on the front and I still hear a "humming noise"while driving. It goes away when turning either direction. What else could this be? Please any help would be great. Thanks!
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Sunday, September 6th, 2009 AT 5:18 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Can you tell where it is coming from? It could be a rear bearing too. Also, what is the condition of the tires? Are they cupped or worn irregularly?
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Tuesday, September 8th, 2009 AT 10:40 AM
Tiny
USAF_FF43
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It is definetly coming from the front. I cannot tell from which side. I am not sure about the tires. But I figured that if the tires were bad I would get vibration which I do not.
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Tuesday, September 8th, 2009 AT 2:42 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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One way to check for wheel bearings is to turn from side to side. If the sound changes, you can determine where the noise is coming from. Also, check the tires for feathering. They can make noise and still not be felt. I realize that you replaced the front bearings, but you may have gotten a bad one Also, make sure the backing plate for the front rotors isn't bent or rusted and rubbing the rotor.

Let me know what you find.
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Tuesday, September 8th, 2009 AT 2:51 PM
Tiny
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As I stated above, it goes away when I turn right or left. The tires looked ok to me. As far as the rotors, I did not notice alot of rust when I changed wheel bearings. I forgot to mention that when I changed the passenger side bearing, my hand got covered in "oil" I could not tell where it was coming from. Is it common for bearing to make noise until you drive it a little?
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Tuesday, September 8th, 2009 AT 3:32 PM
Tiny
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I had a shop look at it. Both bearings are good. Rotars, cv joints, brakes, all good. I rotated all the tires but that did not help. I cannot figure out what is making this noise9 seems to be dead center of engine compt). I drive 106 miles to work and it is killing me. Pleae give me an idea. THanks
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Tuesday, September 15th, 2009 AT 7:16 AM

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