What causes a thugging sound in the right front end while driving?

10

Asked by Jul 30, 2014 at 07:21 PM about the 1998 Pontiac Grand Prix 2 Dr GT Coupe

Question type: Maintenance & Repair

Already checked tires-rotated, already replaced CV joint shaft, already replaced wheel hub assembly.....running out of ideas here.

8 Answers

10

I forgot to add we replaced the brakes as well about 2 mths ago no issues there.

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60,085

Did you check the brake rotor on that side for warpage?

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2,965

check suspention could be a broken coil sring,sway bar or other suspention component.

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2,965

i wanted to write coil spring.

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10

The rate of thugging increases with the speed of the car, we can't really isolate the sound from right or left as it is becoming louder and more centered. We put brand new complete strut on all four 3 yrs ago, but will check. No pulsing in the brakes for warped rotor. Thanks for your ideas I will monitor for any new ideas.

2,815

If you got a remanufactured cv joint, it could still be bad. Also, jack up the car and poke around to make sure all the nuts and bolts are tight and that everything was installed properly.

2,815

Also, if there is up and down vibration, you could have a dented wheel. Try swapping it out and drive with a wheel you know drives smooth to see if that makes any difference.

4,425

If the noise is only under load (that is, when coasting there isn't any noise) it's a bearing/driveline problem. Get the car on a lift, or a set of reliable jacks, all four wheels off the ground. Start the engine, put the car in gear, and with your foot lightly on the brakes, apply a little gas. Turn the steering wheel all the way left to right. You should be able to isolate the noise easily. I'm guessing it's one of the output shaft bearings - maybe both. When the CV joints go bad the bearings are often the next to fail. They can make a pretty serious heavy-metal noise because the CV joint is 'flopping' as the shaft turns instead of being held firmly on its centerline.

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