Pedal and seat wobble/vibration 32-45mph - not a tire/wheel issue - Volvo Forums - Volvo Enthusiasts Forum

Go Back  Volvo Forums - Volvo Enthusiasts Forum > Volvo Vehicles > Volvo XC60
Reload this Page >

Pedal and seat wobble/vibration 32-45mph - not a tire/wheel issue

Volvo XC60 This smaller crossover offers the capabilities of an SUV with less size - ideal for city driving.

Pedal and seat wobble/vibration 32-45mph - not a tire/wheel issue

  #1  
Old 12-31-2018, 12:47 PM
Junior Member
Thread Starter
Join Date: Dec 2018
Posts: 3
Default Pedal and seat wobble/vibration 32-45mph - not a tire/wheel issue

Hi all, I'm at my wits end with an issue I've been trying to trace for the last 6 months with my 2015 XC60 T6 AWD so hoping you might be able to provide some direction. I've searched the depths of the internet including this forum, and have some other suspects, but nothing is matching my issue exactly.

About the car:
-Bought used in Oct 2017 with about 18k miles on it
-Mostly driven around town + a couple road trips - now has 26k miles on it
-Dealer service history shows regular maintenance intervals completed yearly
-Wheels are factory 20" 255/45R20 with Pirelli tires at time issue started

Issue:
-Vibration / wobble appeared suddenly in the 32-45mph range - follows a rotational pattern so I've been focused on wheels and tires mainly
-Felt in gas pedal and in seat - steering wheel has no vibration
-Felt mostly when trying to maintain speed in that range under light acceleration, coasting, and braking
-Under heavy acceleration through that range, very minor vibration felt if any
-Easiest to isolate on freshly paved roads
-When coasting (with foot on gas) or when lightly accelerating after coasting, sometimes it feels like the start of a stall where it's like something is resisting the car's movement in pulses
-Smooths out after 45mph and then you can start to feel a lighter version above 60-65mph
-Some times feels like it gets better the longer I drive

What I've done:
-July 2018 - took car to dealer for 4 year/40k service also complaining of brake vibration and vibration around 70mph in steering wheel. Front rotors were warped so they were replaced, but pads were in fine shape. For vibration, they road force balanced all 4 tires and said 2 were out of spec.
-July 2018 - took car back to dealer a few weeks later with the 32-45mph wobble/vibration*. Again, road force balanced tires (at their cost) and said 3 were out of spec.
-Oct 2018 - Issue was still present since July so took to local mechanic for help. Told me that 2 wheels were bent and told me to have them repaired.
-Nov 2018 - Took car to local wheel shop and they straightened 2 rear wheels + road force balanced tires. Confirmed other wheels were fine.
-Dec 2018 - Took car back to dealer to look at issue. Could not replicate issue despite having car for 2 days. I test drove with them and it wasn't very present (maybe due to a lot of driving prior to test run).
-Dec 2018 - After 12 hour road trip, problem seemed worse so took to Firestone and replaced all 4 tires to Michelin Pilot Sport A/S 3+ All Season + balance + alignment.

Issue still persists after all this and I've ruled out the wheels and tires given the work I've completed. Can't recall now if the issue was present immediately following my first dealer appt in July 2018 where they balanced tires and replaced front rotors or if it just popped up around the same time. I do recall hitting a really nasty pothole around this time too, but may have been in my wife's car.

From everything I've been reading, here are other possible culprits...
-trans/engine mounts, spark plugs, out of balance/bent driveshaft, bad u-joint(s), bent axle, failing CV joint(s), torque converter

Thanks in advance for any advice or help!
 
  #2  
Old 01-02-2019, 02:00 PM
Moderator
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 4,303
Default

Add worn wheel bearing to your list and you pretty much have a complete list of things that can vibrate at road speed. I'd probably rule out thinkgs like the mounts and the torque converter since you reported that the vibration persists while coasting. Same for spark plugs - if you had a misfire, you'd feel it under power not light throttle. So I'd probably focus on axles, suspension components and wheel bearings. Do you notice any change in vibration when turning left or right vs going straight? Does the handling seem normal? any odd sounds or feel going over speed bumps? I'm guessing that your car has about 50K miles now - did they also work on the rear brakes? One time I thought I had warped front rotors and after some testing and inspection work, it turned out to be the rears...
 
  #3  
Old 01-02-2019, 03:48 PM
Senior Member
Join Date: May 2012
Location: Kingsport, TN
Posts: 1,448
Default

I am very skeptical, usually, of sources of vibration posted on the internet. When a car shakes at 55 mph, it's always a tire. Your car doesn't do that. It's not a tire. The speed is all wrong.

I think I might be tempted to take the AWD driveshaft out of it. If you want to look for something mounted to the floor that would shake the pedals and seat, I sure think that's it. It doesn't need to be out of balance to shake (and it's not). Rather, the central u-joint is bad and the resistance in that joint causes reactions each revolution.
 
  #4  
Old 01-02-2019, 04:32 PM
Junior Member
Thread Starter
Join Date: Dec 2018
Posts: 3
Default

Originally Posted by mt6127 View Post
Add worn wheel bearing to your list and you pretty much have a complete list of things that can vibrate at road speed. I'd probably rule out thinkgs like the mounts and the torque converter since you reported that the vibration persists while coasting. Same for spark plugs - if you had a misfire, you'd feel it under power not light throttle. So I'd probably focus on axles, suspension components and wheel bearings. Do you notice any change in vibration when turning left or right vs going straight? Does the handling seem normal? any odd sounds or feel going over speed bumps? I'm guessing that your car has about 50K miles now - did they also work on the rear brakes? One time I thought I had warped front rotors and after some testing and inspection work, it turned out to be the rears...
Appreciate the reply and have wheel bearings added to the list.

To answer your questions: vibration seems consistent going straight or turning. Handling and acceleration seems normal otherwise. No sounds or strangeness going over bumps besides the typical roughness of 20" wheels. Car only has 26k miles on it so still a baby. The brake vibration I was getting was corrected by replacing the front rotors and have been solid since.

Have an appt with a reputable shop this Friday (Jan 4th) to help in the hunt so will update the thread with any findings.
 
  #5  
Old 01-02-2019, 04:36 PM
Junior Member
Thread Starter
Join Date: Dec 2018
Posts: 3
Default

Originally Posted by firebirdparts View Post
I am very skeptical, usually, of sources of vibration posted on the internet. When a car shakes at 55 mph, it's always a tire. Your car doesn't do that. It's not a tire. The speed is all wrong.

I think I might be tempted to take the AWD driveshaft out of it. If you want to look for something mounted to the floor that would shake the pedals and seat, I sure think that's it. It doesn't need to be out of balance to shake (and it's not). Rather, the central u-joint is bad and the resistance in that joint causes reactions each revolution.
Thanks for the thoughts here. I've got a appt in 2 days with a shop here and will be asking for them to take a look at the driveshaft and joints. Fingers crossed I come away with a path to make this go away.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Aredd95
Volvo 240, 740 & 940
7
08-15-2014 07:39 PM
garysvolvo
Volvo S70
2
07-02-2014 02:58 PM
SouthernSwap
Volvo S60 & V60
4
01-08-2014 09:37 PM
threedukes
Volvo 240, 740 & 940
10
07-03-2013 06:24 PM
professor
Volvo 260, 760 & 960
6
11-28-2005 11:17 PM


Thread Tools
Search this Thread
Quick Reply: Pedal and seat wobble/vibration 32-45mph - not a tire/wheel issue


Advertising
Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.