I have a noise coming from the front end

Tiny
GTPCOMPG
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 97,000 MILES
I have a whirring/fast vibration noise coming from my front right when the car is going over 20 mph. The pitch changes with wheel speed but not rpm. The sound is not affected by steering. The transmission was replaced right after the noise started but did not affect it. The brake rotors and pads as well as the hub bearing have been replaced, but the noise is still there. It is not coming from the alternator or the steering pump. I am completely out of ideas because nothing looks obviously damaged or worn.
Saturday, October 1st, 2011 AT 11:28 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Wow! You checked basically everything. Check to make sure the backing plate behind the rotor isn't rusted and rubbing the rotor. Also, are the tires worn evenly? Are you sure the hub bearing wasn't over tightened?
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Saturday, October 1st, 2011 AT 11:35 PM
Tiny
GTPCOMPG
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  • 3 POSTS
Backing plates were replaced with the rotors. Tires and rims were replaced the same time as the brakes. Everything was tightened by torque wrench to factory specs.
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Saturday, October 1st, 2011 AT 11:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Does the noise change with vehicle speed or engine speed? You've replaced everything. It has to be something on the engine.
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Tuesday, October 4th, 2011 AT 3:22 AM
Tiny
GTPCOMPG
  • MEMBER
  • 3 POSTS
The noise changes with vehicle speed not rpm. My next step is to tear down the entire front end again and replace everything else that has not been replaced.
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Tuesday, October 4th, 2011 AT 6:21 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
What haven't you already replaced? It sounds like you hit everything.
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Tuesday, October 4th, 2011 AT 9:13 PM

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