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Old 09-19-2016, 06:29 PM   #1
Bizoink
Scooby Newbie
 
Member#: 158215
Join Date: Sep 2007
Chapter/Region: NWIC
Location: Placerville, CA
Vehicle:
1997 Impreza Outback
Red

Exclamation Vibration from right rear?

So... I have a vibration coming from the rear... I believe the right. I just bought this 97 Impreza Outback Sport about 2 months ago. Nearly immediately noticed the right rear wheel bearing was bad. Yeah.... it was a rust bucket... had to buy a new knuckle.

During that time I had the bad bearing, I noticed what felt like a vibration from the right rear. Sure enough the wheel bearing was so bad it caused the tired to wobble a smidge.

Well... now my wheel bearing is fixed, but I still have a vibration. It is most noticeable between 10-30mph. It's still there somewhat between 30-55, then starts coming back a bit 60-70mph. It also is really noticeable when weight is on the backend, such as going up a hill or accelerating.

Braking via peddle or e-brake has no difference in it. I was going to take it in for an alignment, but I'm not sure whats the problem.

Also just to clarify the vibration, I feel it mostly in my seat, not the steering wheel.
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Old 09-19-2016, 10:11 PM   #2
Elbert Bass
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Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
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Alignment isn't really a primary cause of vibration.

Possibly look for out of round or out of balance tire. Balance will be most likely cause if it only happens within a specific speed range. It could be your tire treads are severely cupped if the wheel bearing wobble had been there for a long time.

Another thing to look at is the u-joints in the driveshaft. if they go bad the shaft will bind and can cause intermittent vibration.
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Old 09-20-2016, 10:12 AM   #3
Bizoink
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Member#: 158215
Join Date: Sep 2007
Chapter/Region: NWIC
Location: Placerville, CA
Vehicle:
1997 Impreza Outback
Red

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Quote:
Originally Posted by Elbert Bass View Post
Alignment isn't really a primary cause of vibration.

Possibly look for out of round or out of balance tire. Balance will be most likely cause if it only happens within a specific speed range. It could be your tire treads are severely cupped if the wheel bearing wobble had been there for a long time.

Another thing to look at is the u-joints in the driveshaft. if they go bad the shaft will bind and can cause intermittent vibration.
Thanks for the pointers. Thats what I thought on the alignment, I thought I would start there since the steering wheel does sit a little sideways and it pulls just a little.

The tires look totally normal. It's not intermittent, seems pretty consistent. The place I was going to take it does alignment and tires, so maybe they can just look over everything.

Thanks!

**Edit** now im starting to wonder, because I didn't have this vibration before the wheel bearing went out. But now the wheel bearing is good, the wheel is firm, but the vibration is there...

Last edited by Bizoink; 09-20-2016 at 01:44 PM.
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Old Today, 02:42 AM   #4
MedicDG
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Member#: 329822
Join Date: Aug 2012
Location: Rocklin, CA
Vehicle:
2016 WRX STi
WRB

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Try making sure wheel is centered and retorque all lug nuts to spec.
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