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  #1  
Old 04-18-2014, 09:58 PM
weatherman07 weatherman07 is offline
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Vibration when coasting at highway speed

Hi all,

I'm new to the forum, but have a question about my new (used) '08 328xi. I purchased it in the middle of February and so far have experienced a few issues, so I'm a little stressed out over the whole thing; especially since I came from a 2012 Chevy with a full warranty.

Right now I am getting a vibration and noise when I let off of the gas pedal completely when traveling at highway speeds. I can look at the passenger seat and the headrest is moving back and forth slightly, but I can also feel the vibration in my feet and the steering wheel.

I took it back to the dealer I bought the car from (a Hyundai dealer - stupid I know) and they took it to a BMW dealer to get it aligned after putting new tires and brakes on. That BMW dealer also replaced a bad coil in cylinder 3. Going from the worn run-flat tires to new ones made an improvement; the car no longer vibrates when driving along, only under deceleration/coasting now.

So, I'm wondering if it is a bent or unbalanced rim, or something more serious like a CV joint, differential, or transfer case. I think it is a drivetrain issue as the vibration only noticeably occurs while coasting.

Thanks!
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  #2  
Old 04-19-2014, 09:11 AM
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pointandgo pointandgo is offline
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Quote:
Originally Posted by weatherman07 View Post
Hi all,

I'm new to the forum, but have a question about my new (used) '08 328xi. I purchased it in the middle of February and so far have experienced a few issues, so I'm a little stressed out over the whole thing; especially since I came from a 2012 Chevy with a full warranty.

Right now I am getting a vibration and noise when I let off of the gas pedal completely when traveling at highway speeds. I can look at the passenger seat and the headrest is moving back and forth slightly, but I can also feel the vibration in my feet and the steering wheel.

I took it back to the dealer I bought the car from (a Hyundai dealer - stupid I know) and they took it to a BMW dealer to get it aligned after putting new tires and brakes on. That BMW dealer also replaced a bad coil in cylinder 3. Going from the worn run-flat tires to new ones made an improvement; the car no longer vibrates when driving along, only under deceleration/coasting now.

So, I'm wondering if it is a bent or unbalanced rim, or something more serious like a CV joint, differential, or transfer case. I think it is a drivetrain issue as the vibration only noticeably occurs while coasting.

Thanks!
IMO, if it was a wheel/tire issue you would feel a vibration at various cruising speeds as well...but you don't, right?

Are your wheels original BMW wheels intended for your car? After a visual inspection do they seem damaged in any way (bent flange)?
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  #3  
Old 04-19-2014, 10:00 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by weatherman07 View Post
I'm new to the forum, but have a question about my new (used) '08 328xi. I purchased it in the middle of February and so far have experienced a few issues, so I'm a little stressed out over the whole thing; especially since I came from a 2012 Chevy with a full warranty.

Right now I am getting a vibration and noise when I let off of the gas pedal completely when traveling at highway speeds. I can look at the passenger seat and the headrest is moving back and forth slightly, but I can also feel the vibration in my feet and the steering wheel.

I took it back to the dealer I bought the car from (a Hyundai dealer - stupid I know) and they took it to a BMW dealer to get it aligned after putting new tires and brakes on. That BMW dealer also replaced a bad coil in cylinder 3. Going from the worn run-flat tires to new ones made an improvement; the car no longer vibrates when driving along, only under deceleration/coasting now.

So, I'm wondering if it is a bent or unbalanced rim, or something more serious like a CV joint, differential, or transfer case. I think it is a drivetrain issue as the vibration only noticeably occurs while coasting.

You now know why the vehicle was for sale.
  • Mileage?
  • Pre-purchase inspection with 3rd party?
  • Maint history?
  • Have you checked suspension components?
  • Alignment?
  • Collision history?
Yup, you have homework. These are routine pre-purchase checks most don't do...purchases are often an emotion.
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  #4  
Old 04-19-2014, 11:14 AM
fdriller9 fdriller9 is offline
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The seat vibrating is pretty normal.

This issue can be worn bushings, warped rotors (unlikely), out of balance wheels, cupped tires, or wheel bearings.

Bad wheel bearings don't really cause vibrations unless they are really bad though. You would hear the noise much sooner than you would feel vibrations.
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  #5  
Old 04-19-2014, 11:21 AM
weatherman07 weatherman07 is offline
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Location: Connecticut, USA
 
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Quote:
IMO, if it was a wheel/tire issue you would feel a vibration at various cruising speeds as well...but you don't, right?
I do not. A slight vibration, maybe, but since I don't know how a perfectly normal 328xi drives, I can't say. My previous cars were perhaps a bit smoother.

Quote:
Are your wheels original BMW wheels intended for your car? After a visual inspection do they seem damaged in any way (bent flange)?
Yes, they are the regular 2008 328xi wheels. They don't look bent to me, but seeing as the car had run-flats before and I live in CT (the car was also from CT) where the roads are full of potholes, it isn't out of the realm of possibility that they could be bent.

Quote:
You now know why the vehicle was for sale.
Yeah, you could say that again. My dad always said people don't trade in cars until they start nickel-and-diming them. I don't learn.

Quote:
Mileage?
about 97,000. I am the third owner. The first owner was a lessee who drove it up to 30,000 miles. The second owner had the car for 2 years and went anothe 60,000 miles, so I assume they're all highway.

Quote:
Pre-purchase inspection with 3rd party?
Strictly speaking, no. It had a 60 day warranty, but after I took delivery I took it to two indie BMW specialists who said it was fine and I should easily get another 100,000 miles.

Quote:
Maint history?
I have no idea; I know it was serviced at BMW of Darien, CT. I can call them to get the records

Quote:
Have you checked suspension components?
Short answer - no.

Quote:
Alignment?
Yes, supposedly just done at BMW of Ridgefield, CT

Quote:
Collision history?
According to the Carfax, nothing.

Thanks!
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  #6  
Old 04-19-2014, 11:24 AM
weatherman07 weatherman07 is offline
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Quote:
The seat vibrating is pretty normal.
Really?

Quote:
This issue can be worn bushings, warped rotors (unlikely), out of balance wheels, cupped tires, or wheel bearings.
It's not the rotors, they were just replaced. The tires too. The weird thing is, I only notice the noise and vibration when I let off of the gas pedal.

Thanks everybody for your replies.
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  #7  
Old 04-19-2014, 03:14 PM
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CALWATERBOY CALWATERBOY is offline
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[QUOTE=weatherman07;8287627]It's not the rotors, they were just replaced. The tires too. The weird thing is, I only notice the noise and vibration when I let off of the gas pedal./QUOTE]


Look at suspension components. Shocks, front struts, bushings; ball joints.

Important! Re-torque everything! Then decide.
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  #8  
Old 04-19-2014, 03:32 PM
hondo402000 hondo402000 is offline
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Your girlfriend would like the experience in the passenger seat
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  #9  
Old 04-19-2014, 08:01 PM
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Greggl52 Greggl52 is offline
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I have the 08 328xi as well and i do not have the same problems. Like the others said it could be the allignment or tire psi. Maybe its just the run flatts??

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  #10  
Old 04-19-2014, 08:43 PM
marc0 marc0 is offline
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Do you get the same vibration when on neutral? if not, then most likely the cause is in the drive train. Check the joints in the drive shaft -- http://www.fcpeuro.com/products/bmw-...t-26117573276l
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  #11  
Old 04-19-2014, 08:59 PM
fdriller9 fdriller9 is offline
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Originally Posted by weatherman07 View Post
Really?



It's not the rotors, they were just replaced. The tires too. The weird thing is, I only notice the noise and vibration when I let off of the gas pedal.

Thanks everybody for your replies.
Yes next time you are driving in your car, look at the passenger headrest. It will shake slightly.

My passenger seat has always vibrated a bit since new.

If a passenger is sitting in the seat, it doesn't shake nor can the passenger feel any vibration.

EDIT: I thought you were another poster. Didn't realize this was your thread
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  #12  
Old 04-20-2014, 06:37 AM
roadkillrob roadkillrob is offline
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Originally Posted by marc0 View Post
Do you get the same vibration when on neutral? if not, then most likely the cause is in the drive train. Check the joints in the drive shaft -- http://www.fcpeuro.com/products/bmw-...t-26117573276l
I would lean towards this - if you don't get the vibration when power is being applied, but only when you let off the power, I would say either driveshaft or guibo (flex joint in driveshaft) or possibly a transaxle. I would check all those items for play - guibo's are a wear item and do cause a vibration when they wear out - not sure your mileage, have seen those go from 100k on up. Axles you can usually hear either the bearing if it is faily or the CV joint also typically starts to make a noise if it is failing.
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  #13  
Old 04-20-2014, 09:52 AM
asmonroe asmonroe is offline
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I had a similar issue in my '08 328i. It turned out to be a bent rim that could not be seen until the tire was removed from the rim. The dealership had a rim specialist correct it and I didn't have any problems after that. As far as the passenger seat headrest vibrating, I agree that it seems pretty normal (has occurred in pretty much every car that I've had).
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  #14  
Old 04-20-2014, 11:29 AM
Wilson1911 Wilson1911 is offline
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Rule out the wheels first is my thought. Perhaps you could install another set for testing purposes. It sounds like new tires corrected part of the issue so a slightly bent rim is still possible. I also live in CT and the roads are terrible.
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  #15  
Old 07-14-2014, 06:24 PM
weatherman07 weatherman07 is offline
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Sorry to revive this old thread, but I just wanted to follow up, since I'm appreciative of the help I got on this.

I ended up taking the car in to an excellent indie for a drive belt tensioner and while it was there I had him look into the vibration. He noticed there were no weights on the driver's side front wheel (which I had noticed long ago and TOLD the dealer) and he balanced them. This solved the vibration to about 50% of what it was. He admitted he was unable to resolve it all, but he assured me everything else on the car looks solid.

The BMW dealer put different wheels/tires on the car and said the vibration was completely resolved, so I would guess that the rim is bent and it just isn't noticeable with the tires on.

Anyway, that's the official prognosis, so I just wanted to close out this thread solidly.
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