2001 Pontiac Grand Prix Stumped. Please help!

MIGUEL123

MEMBER
2001 PONTIAC GRAND PRIX
6 CYL
2WD
AUTOMATIC
87,000 MILES

I have been hearing a rumbling (buzzing maybe) noise that gets louder as the car accelerates and continues the entire time the car is moving. I know it can't be in the engine since I can put the car in neutral and the noise continues as the car coasts. The noise is louder than the radio now! I noticed when I turn to the right it goes away, but to the left it gets worse, so I replaced the axle/cv joint assembly and the hub assembly on the left side. Now the noise is still there and I also can hear rubbing when I turn. Please somebody help me! It's driving me mad!

5 Replies

MMPRINCE4000

MECHANIC
8,548 POSTS

Raise car put on stands, grasp tire and push/pull both horizontally and vertically, you are looking for any movement, which would indicate a bearing, ball joint, tie rod, or bushing problem. Do this on both wheels.

Also inspect the CV boots on the other axle, look for rips/tears in the boot (inner and outer) and any lubricant leaking from boots.

Also inspect the brakes, make sure calipers bolts are tight as well as bracket is tight.

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Thursday, February 26th, 2009 AT 7:52 AM

MIGUEL123

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5 POSTS

Thanks for your response! I put the car on jacks and there is no movement in the wheel on either side. The brake calipers seemed fine as well as the cv joints on the side I didn't replace. (Right side) The tie rods seem to be very tight with no play in them. I just don't know what else it could possibly be! Any more ideas?

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Thursday, February 26th, 2009 AT 3:58 PM

MIGUEL123

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5 POSTS

I should also tell you that I checked all this after fixing the rubbing problem. The axle I installed wasn't tightened down as far as it could go. So that's no longer a problem, but the buzzing noise I noticed starts around 30 mph and gets very loud as I near 60 mph.

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Thursday, February 26th, 2009 AT 4:01 PM

MMPRINCE4000

MECHANIC
8,548 POSTS

Make sure the fluid level in trans is full. Check the motor mounts, but it sure sounds like a bearing.

Try moving front tires to rear, see if noise moves with them.

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Friday, February 27th, 2009 AT 8:19 AM

MIGUEL123

MEMBER
5 POSTS

I have been swamped at work so I haven't got back to it yet. But I will check on all this, except the transmission fluid since I always make sure that's up to level anyways. I will let you know. What woul d I check on the motor mounts?