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Old 11-18-2013, 07:10 AM   #1
kenizzle36
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Weird humming noise from rear.

Hey guys. I have a loud ad annoying humming noise coming from the rear of my car. I've changed out both wheel bearings/drum and it hasn't stopped. Any ideas?


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Old 11-18-2013, 09:04 AM   #2
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Its your tires
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Old 11-18-2013, 09:52 AM   #3
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Ok. Well I was thinking that. Just wanted more input on other possibilities.
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Old 11-18-2013, 11:06 AM   #4
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Forgot to mention that when I turn left the sound goes away. When I straighten out it's back.
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Old 11-18-2013, 11:15 AM   #5
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Its your tires
this

if your tires are cupped/feathered bad enuf to make noise, you can probably see the alternating wear pattern if you kneel down behind the car and look at the tread face, it's pretty obvious.

In which case you're likely due for new shocks and an alignment (using the revised specs often quoted on this forum), and probably new tires (I was never able to find a shop that still offers a shaving service).
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Old 11-18-2013, 11:46 AM   #6
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Forgot to mention that when I turn left the sound goes away. When I straighten out it's back.
Are you sure its not a front wheel bearing?
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Old 11-18-2013, 12:28 PM   #7
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^yep, that's what I'm thinking now, too.

originally, I glanced at his profile and thought it said "03 ZX3", but now I realize it was your profile! I know that the hatchbacks suffer cupping problems, but not sure if the sedans have the same problem since the weight distribution is probably better.
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Old 11-18-2013, 02:45 PM   #8
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Definitely coming from the back. I sat in the back seat to be sure. But I have only one more bearing left which is the driver front. Also tires are wearing really bad on the inside of the tire. Also kinda wavey. Changed the rear shock obsorbers was told they were wearing like that from the bad shocks
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Old 11-18-2013, 02:56 PM   #9
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yeah, I guess cupping could be described as "wavey". if you kneel along the side of the car facing the wheel, you'll probably see an "up-down-up-down" pattern to the treads.

Based on what I've seen on this forum over the years, abnormal tire wear on a Focus seems to occur only in the rear and appears as cupping and/or inner wear. I had both and it sounds like you do, too.

The inner tire wear is due to excessive camber and/or toe. Excessive camber is a frequent topic of conversation here; a new set of LCA's and new coil springs fixed mine.
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Old 11-18-2013, 04:24 PM   #10
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yeah, I guess cupping could be described as "wavey". if you kneel along the side of the car facing the wheel, you'll probably see an "up-down-up-down" pattern to the treads.

Based on what I've seen on this forum over the years, abnormal tire wear on a Focus seems to occur only in the rear and appears as cupping and/or inner wear. I had both and it sounds like you do, too.

The inner tire wear is due to excessive camber and/or toe. Excessive camber is a frequent topic of conversation here; a new set of LCA's and new coil springs fixed mine.
I highlighted toe because that is going to be a bigger killer than camber
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