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Road noise? Or sport contact 6?

809 views 3 replies 3 participants last post by  -fritz- 
#1 ·
Bought the car used, and it seems these car have alot of road noise (info I got from the search feature!) anyways.
Also from the search I see the continental sport contact du06 are noisy when they get some miles on them. These look very good and still have very readable DWS on all four tires.
My question is how do I differentiate the two? Or maybe it's even a bad bearing? Or ???

Suggestions on diagnosing the noise? I thought about putting the cars on Jacks, and running the tires while up in the air.
I am figuring if it's road or tire noise I won't hear it while jacked up....right?

But I should still hear the bearing if it's that?
I am in Northeast MD so if anyone is close by I can drive to you if you can help me diagnose this.
 
#2 ·
you might not hear bearing/axle noise with the wheels up b/c there is no load on the suspension and joints so it can be misleading. If you do hear something while it's lifted up, you at least have eliminated front wheel bearings as a possibility.

You can usually tell if it's road & tire noise by listening carefully when you change from one road surface to another (eg. old grey to fresh black pavement). If everything goes quiet when you hit freshly laid black pavement, it's 100% your tires. Noisy tires with tread slap also make noticeable changes or introduce new sounds when you go over painted lines, or that squishy black tar-like material they use to fill cracks in the road (if your area uses that stuff) - you'll hear the tire slap (buzzing or smacking). My Bridgestone RE71-Rs were notoriously loud over everything, my new Pilot Sport 4's are quiet as heck.

On the other hand, a bad bearing or joint may sound pretty much constant and may only vary with speed or load on the axle (eg. during a turn) and will not change depending on road surface. You can easily check some things yourself - get under the car and by each wheel, check the rubber boot where the axle meets the hub (CV Joint Boot) and look for tears/rips or obvious signs of lubricant coming out. Bearings are a little tougher but if you have a joint bearing going, one easy check is lifting the car up and seeing if you can 'shake' any of your wheels - if a wheel has any free play (eg clunks around, even slightly) it means a bearing is probably done. Beyond that, if you have a Track/Ultimate model, your rear diff may just need a flush - mine makes a slight howling noise when it's cold and needs fresh fluid. Other possibilities are your driveshaft U-Joint making noise, or even your accessory belt or an accessory pulley wheel bearing somewhere in the engine bay.
 
#3 ·
Thanks for the info. I don't hear any change in sound while going side to side. The noise seems to come from all 4 corners with the windows down. It was raining so didn't get to jack it up. I was gonna do that to check tire noise. I did try jacking up a few days ago and rocked tire top to bottom and heard nothing. I read that on here, said it could help diagnose a bearing. I'm outside not and will update in a few hours.
Thanks again bro
 
#4 ·
Bad wheel bearings can be checked by feeling the wheels near the center after driving. A bad wheel bearing will make the specific wheel feel much hotter because of the friction. Not a true test, but it may give you an indication of a problem.
 
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