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#4785543 - 06/13/18 07:23 AM 2008 Subaru Legacy Vibration at wits end!
racin4ds Online   content


Registered: 05/07/10
Posts: 1049
Loc: Ocala, Florida
Hi guys, I'm looking for some advice. I consider myself a pretty decent mechanic, been turning wrenches for around 20 years and have many certs to go with it but I don't do it as a trade anymore.

Anyway, my wife's 2008 Legacy GT has had a vibration or "shimmy" that has been there since we acquired the car. I thought new tires and good balance would fix it but I was wrong. It occurs exactly at 62-65mph and seems to come and go... I've rotated the tires, checked for bent wheels etc. I've went up with air pressure and down. I've checked for wheel bearing play and tie rod play. Nothing in the front end seems loose. I'm convinced it is NOT the wheel/tire as it is still occurs exactly the same speed no matter which tire it where and done it with the old tires.

The only fault thats visible that I haven't addressed yet is a torn CV boot on the passenger side. I have a new axle and plan to do that this weekend.

Brakes and rotors were replaced with new powerslot kit about 10k miles ago. I'm getting ready to just rip the entire front end apart and replace everything but I'd like to avoid that if necessary...
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#4785557 - 06/13/18 07:38 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
Chris142 Online   content


Registered: 06/05/03
Posts: 17151
Loc: Deplorable in apple valley, ca
Bent or worn axle
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#4785563 - 06/13/18 07:44 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: Chris142]
racin4ds Online   content


Registered: 05/07/10
Posts: 1049
Loc: Ocala, Florida
But in my years of experience, a bad CV axle usually only rears its head on hard acceleration or sharp turns, neither of which mine does.
_________________________
Just say NO to thin oils and M1!
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#4785576 - 06/13/18 07:59 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
Trav Offline


Registered: 11/20/06
Posts: 19658
Loc: MA, Mittelfranken.de
Inner CV joint problems can cause this on some Subaru, the boot looks perfect but the grease has turned to oil and the joint worn out. Did you check for rack play, internal movement and the mounting bushings?
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#4785589 - 06/13/18 08:15 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
Oily_Thing Offline


Registered: 03/16/18
Posts: 46
Loc: Missouri
Bad engine mount.
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#4785603 - 06/13/18 08:27 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: Oily_Thing]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1578
Loc: wv
Could be a few things..im a subaru guy..or was.

If its an aftermarket CV shaft there were issues with them not being balanced properly that was yrs ago.

Sticky or frozen caliper/piston

Bad hub or wheel bearing

Ball Joints

Bent Rim

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#4785612 - 06/13/18 08:36 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
Danno Offline


Registered: 10/07/12
Posts: 2055
Loc: Northern Ontario, Canada
I would listen to the 2 answers from the seasoned mechanics - and they point to an axle related issue.
Chris142 and Trav
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#4785750 - 06/13/18 10:46 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 3040
Loc: Wet side WA
This problem has been on going since the car was new and the Stealership never fixed it? I guess that's just one more reason not to buy a Subaru they ignore to many warranty issues.
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#4785807 - 06/13/18 11:43 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: JohnnyJohnson]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1263
Loc: Winchester, Indiana
Originally Posted By: JohnnyJohnson
This problem has been on going since the car was new and the Stealership never fixed it? I guess that's just one more reason not to buy a Subaru they ignore to many warranty issues.


Johnny, way to jump off the cliff without reading the details... he said it was present "since we acquired the car". Nothing mentioned at all about buying it new. And Subaru obviously isn't as horrible as you make them out to be, they've been awarded the vehicles with highest resale value like 3 times out of the past 5 years... people aren't willing to pay top dollar for used pieces of junk. Not like a new Dodge minivan, which loses something stupid like 83% of its value in the first 5 years...

OP, I had the same issue on my Odyssey two years ago, which showed up when I had snow tires on. At first, I thought it was the tires, so I rotated and rebalanced them to no avail. I called my brother who is also a mechanic, and said essentially the same thing as Trav; inner CVs. I checked and none of the boots were torn, but the vibration was getting pretty bad. I had both axles replaced, and voila, no more vibration at any speed.

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#4785832 - 06/13/18 12:12 PM Re: 2008 Subaru Legacy Vibration at wits end! [Re: SubieRubyRoo]
SatinSilver Offline


Registered: 01/24/08
Posts: 10488
Loc: OH
Looks like car was purchased 1/15/17:

Originally Posted By: racin4ds
Hi All,

Just picked up a nice little 08 Subaru Legacy GT 2.5 Turbocharged. Very nice little ride! I have no previous experience with a turbocharged gasoline car. It calls for 5W30 but I'm wondering since it is likely to abuse the oil more than a standard engine if I shouldn't run a 5W40 or 0W40 syn? In the diesel world most cars/trucks are running a 40W I guess due to viscosity breakdown from the extra heat.

Looking for thoughts and opinions from others with small, turbocharged vehicles. I could care less about CAFE/MPG. I want PROTECTION!

Also Subaru experts, anything I should be on the lookout for? Are these things reliable?

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#4785851 - 06/13/18 12:34 PM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
Oldmoparguy1 Online   content


Registered: 01/21/05
Posts: 5631
Loc: Charlotte, NC
I had a similar issue on my 2000 Dodge GC some years ago. Was the original axle with 120k on the van. It looked fine. Finally, the boot cracked and it started slinging grease. Replaced with a new shaft and there was no more weird stuff. In my case it was the right shaft.

YMMV

Wayne
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#4785984 - 06/13/18 03:36 PM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
racin4ds Online   content


Registered: 05/07/10
Posts: 1049
Loc: Ocala, Florida
Yes car was purchased used- not new so no dealers involved.

I'm going after the axles this weekend so we'll see what that brings, thanks for the tips/advice gents!!

Overall, I love the car, it has 150k on the clock now and nothing has been done other than the turbo replacement when I bought it. (why I got it so cheap) It handles great, runs very well and is a blast to drive with the 5 speed.
_________________________
Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
2008 Kawasaki Ninja 650R

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#4786005 - 06/13/18 04:04 PM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
Trav Offline


Registered: 11/20/06
Posts: 19658
Loc: MA, Mittelfranken.de
I have 3 of those OE axles sitting right in the garage waiting for new inner joints (outer are perfect just reboot job with poly) I ordered from Europe. Every one of them a lube fail on the inner, perfect boots.
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#4786347 - 06/14/18 01:41 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: Trav]
sxg6 Offline


Registered: 05/23/04
Posts: 2487
Loc: Northeast
Just a heads up.. If it's an AT legacy, I've heard that people have vibrations at idle with aftermarket cv axles. I understand that's not your current issue, but if you're putting an aftermarket in this weekend, that could happen. The vibration occurs when stopped in drive, but goes away if you shift into neutral.

Not sure what the culprit might be for your current vibration issue.

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#4786402 - 06/14/18 05:37 AM Re: 2008 Subaru Legacy Vibration at wits end! [Re: racin4ds]
ccs368 Offline


Registered: 06/13/18
Posts: 16
Loc: NYC, NY
I replaced both left and right side torn inner boots with Dorman universal silicone CV boots as they claim silicone is more heat resilient to poly boots. So far it has not torn after 1 year or 12K miles. It was for a 06 Outback with 95K at the time. The reason for boot replacement and not entire axle replacement was for the reasons posters mentioned above with aftermarket axles creating vibration or fitment issues plus cost. Allwheeldriveauto.com has an excellent write up just for this repair. Also, two well respected youtubers, south main auto and pine hollow diagnostics have videos depicting using OEM and not aftermarket axle replacements too. I followed pine hollow diagnostics video to separate the joint but keeping the green cup coupled to the transmission case. Maybe investigate if your axles were replacements with aftermarket too before you purchased car and systematically eliminate potential causes of your vibration issues.


Edited by ccs368 (06/14/18 05:38 AM)
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