I have a noise coming from the front end

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.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 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

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

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

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

GTPCOMPG

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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

JACOBANDNICKOLAS