Anyone having problems with a vibration on G8 GT? - G8Forum.com

ryadsumata · 10-04-2008, 02:14 PM

Hi,

I have a 2009 G8 GT, 1SC options package, had it for about 40 days and the GM dealer I bought it from has been trying to diagnose a vibration. They've re-balanced, done a road-force balance, switched out different tires/rims, etc, but it still persists, sometimes you feel it in the steering wheel, sometimes the whole car vibrates, speeds vary at which it occurs, but is generally from 70km/h and up. Could this be a driveshaft issue? Anyone else experiencing this? The Dealer is going to help for sure, but just thought I might not be the only one... Thoughts?

Other than that, car is an overall amazing value and vehicle, I love the space as I am quite tall and people can still fit in the back, and hey.... gotta love the V8. (Getting decent gas mileage, too!)

Also, has anyone added subs/amp? I don't want to mess with the dash, but it defintely needs a more well-rounded stereo.

Thanks!

chiefpontiac · 10-06-2008, 09:39 AM

Most vibration issues have been cured with what has already been done to your car. Considering they swapped out wheels/tires I would tentatively eliminate that as the problem. Driveshafts also are balanced when manufactured, that would be a place to look. Also this is a wild-out-there suggestion but it has happened on at least one vehicle - the cars come with shipping blocks in the suspension that are supposed to be removed possibly before they get to dealer, maybe by dealer. Also the tires come overloaded with air for shipment, which also at some point needs adjustment.

That's all I've got, welcome to the forum.

ryadsumata · 10-15-2008, 02:37 PM

Thanks for the feedback. GM recently issued a service bulletin that indicates there may be a driveline issue of some kind, but I don't know specifics, the car is in the shop today and will hopefully be all good.

Thanks,
Ryad

ryadsumata · 10-30-2008, 07:35 PM

Hi all,

I've seen several posts on the internet from G8 GT owners having the same issue of a vibration, and as mentioned in my previous posts, GM issued a bulletin relating to the drivetrain, but it did not fix my G8. After 2 Road Force Balances and several adt'l trips to the dealer for other attemps to repair, they have finally acknowledged that there are 2 faulty tires, Goodyear Eagle RS-A's and as per many other posts online, the tire problem appears to be quite prevalent. This is eaither due to the 60 day shipping process from Austrailia or the tires are just poor quality, but either way my dealer is replacing 2 tires asap, and I am thinking this should solve the problem based on all the info out there and based on my G8's vibration.

Anyways, just wanted to update, as it's been a frustrating 2 months of ownership thus far, but other than that the car is amazing.

Ryad

Valkim · 11-13-2008, 11:11 AM

I had the same issue, I never reported he problem to the dealer, I just assumed it was poor balancing on the factory wheels. I really didn't care much since I had new wheels on order for it anyway. However, now with the new wheels, it still has the same issue.

Any updates on this issue before i take it in???

ryadsumata · 11-14-2008, 01:00 PM

Hi,

The 2 tires they ordered for me are finally in, I am booked in for Monday to have them installed and will update this post to verify if it fixed the problem.

Ryad

fcsuperY · 11-15-2008, 01:42 PM

How bad is the vibration?

ryadsumata · 11-15-2008, 05:53 PM

Quite bad. I guess some drivers might not notice it depending on the road conditions, but it gets better/worse depending on air temp, tire temp, etc.
They've re-balanced the driveshaft, done road forces, switched wheels, etc, but thankfully they finally were able to condemn two tires. It is most noticeable at speeds of 70km/h up and generally gets worse at higher speeds. Sometimes the entire car shakes, sometimes it is felt in the steering wheel, sometimes both. Just glad the dealership is not giving up and won't give up. There are many other posts online pertaining to this on G8's, which is interesting.

Are you having the same problem?

Ryad

fcsuperY · 11-17-2008, 09:21 AM

No, I'm only getting get the DoD vibration which I feel in the steering wheel. Also, I heard that drive train related vibration (sounds like what you are experiencing) was in the non-sport package G8's.

ryadsumata · 11-25-2008, 07:11 PM

Hi all,

Just updating my post...Got 2 new tires, same make, etc, and the vibration is almost gone so it is clearly the tires, 100%. Unfortunately, the 2 new tires are of such a different quality than the old ones (Goodyear Eagle RS-A 18's) that it now feels like there are 2 completely different sets of tires on the car. They're going to try and install both of them on the back, then the front to make extra sure, as they installed one on the back and one on the front initially. Either way, I am pleased to announce that it has nothing to do with anything mechanical, and the dealer is going to continue to make it right.

I'll update when it's all good!

Long live the North American Auto Industry!

Ryad

10-04-2008, 02:14 PM	#1 (permalink)
ryadsumata Junior Member Join Date: Jun 2008 Posts: 9 :	Anyone having problems with a vibration on G8 GT? Hi, I have a 2009 G8 GT, 1SC options package, had it for about 40 days and the GM dealer I bought it from has been trying to diagnose a vibration. They've re-balanced, done a road-force balance, switched out different tires/rims, etc, but it still persists, sometimes you feel it in the steering wheel, sometimes the whole car vibrates, speeds vary at which it occurs, but is generally from 70km/h and up. Could this be a driveshaft issue? Anyone else experiencing this? The Dealer is going to help for sure, but just thought I might not be the only one... Thoughts? Other than that, car is an overall amazing value and vehicle, I love the space as I am quite tall and people can still fit in the back, and hey.... gotta love the V8. (Getting decent gas mileage, too!) Also, has anyone added subs/amp? I don't want to mess with the dash, but it defintely needs a more well-rounded stereo. Thanks!

10-30-2008, 07:35 PM	#4 (permalink)
ryadsumata Junior Member Join Date: Jun 2008 Posts: 9 :	Getting there.... Hi all, I've seen several posts on the internet from G8 GT owners having the same issue of a vibration, and as mentioned in my previous posts, GM issued a bulletin relating to the drivetrain, but it did not fix my G8. After 2 Road Force Balances and several adt'l trips to the dealer for other attemps to repair, they have finally acknowledged that there are 2 faulty tires, Goodyear Eagle RS-A's and as per many other posts online, the tire problem appears to be quite prevalent. This is eaither due to the 60 day shipping process from Austrailia or the tires are just poor quality, but either way my dealer is replacing 2 tires asap, and I am thinking this should solve the problem based on all the info out there and based on my G8's vibration. Anyways, just wanted to update, as it's been a frustrating 2 months of ownership thus far, but other than that the car is amazing. Ryad

11-15-2008, 01:42 PM	#7 (permalink)
fcsuperY Junior Member Join Date: Oct 2008 Posts: 14 :	How bad is the vibration? __________________ - fcsuper fcsuper's unofficial Pontiac G8 experience Magnetic Grey Metallic Stock with Premium/Sports/Moonroof packages Splash guards and various other trimmings Silicon Valley, CA

11-17-2008, 09:21 AM	#9 (permalink)
fcsuperY Junior Member Join Date: Oct 2008 Posts: 14 :	No, I'm only getting get the DoD vibration which I feel in the steering wheel. Also, I heard that drive train related vibration (sounds like what you are experiencing) was in the non-sport package G8's. __________________ - fcsuper fcsuper's unofficial Pontiac G8 experience Magnetic Grey Metallic Stock with Premium/Sports/Moonroof packages Splash guards and various other trimmings Silicon Valley, CA

11-25-2008, 07:11 PM	#10 (permalink)
ryadsumata Junior Member Join Date: Jun 2008 Posts: 9 :	Getting there... Hi all, Just updating my post...Got 2 new tires, same make, etc, and the vibration is almost gone so it is clearly the tires, 100%. Unfortunately, the 2 new tires are of such a different quality than the old ones (Goodyear Eagle RS-A 18's) that it now feels like there are 2 completely different sets of tires on the car. They're going to try and install both of them on the back, then the front to make extra sure, as they installed one on the back and one on the front initially. Either way, I am pleased to announce that it has nothing to do with anything mechanical, and the dealer is going to continue to make it right. I'll update when it's all good! Long live the North American Auto Industry! Ryad

10-06-2008, 09:39 AM	#2 (permalink)
chiefpontiac Super Moderator Join Date: Dec 2007 Posts: 247 :	Most vibration issues have been cured with what has already been done to your car. Considering they swapped out wheels/tires I would tentatively eliminate that as the problem. Driveshafts also are balanced when manufactured, that would be a place to look. Also this is a wild-out-there suggestion but it has happened on at least one vehicle - the cars come with shipping blocks in the suspension that are supposed to be removed possibly before they get to dealer, maybe by dealer. Also the tires come overloaded with air for shipment, which also at some point needs adjustment. That's all I've got, welcome to the forum.

10-15-2008, 02:37 PM	#3 (permalink)
ryadsumata Junior Member Join Date: Jun 2008 Posts: 9 :	Thanks for the feedback. GM recently issued a service bulletin that indicates there may be a driveline issue of some kind, but I don't know specifics, the car is in the shop today and will hopefully be all good. Thanks, Ryad

11-13-2008, 11:11 AM	#5 (permalink)
Valkim Junior Member Join Date: Nov 2008 Location: Texas Posts: 3 :	I had the same issue, I never reported he problem to the dealer, I just assumed it was poor balancing on the factory wheels. I really didn't care much since I had new wheels on order for it anyway. However, now with the new wheels, it still has the same issue. Any updates on this issue before i take it in???

11-14-2008, 01:00 PM	#6 (permalink)
ryadsumata Junior Member Join Date: Jun 2008 Posts: 9 :	Hi, The 2 tires they ordered for me are finally in, I am booked in for Monday to have them installed and will update this post to verify if it fixed the problem. Ryad

11-15-2008, 05:53 PM	#8 (permalink)
ryadsumata Junior Member Join Date: Jun 2008 Posts: 9 :	Quite bad. I guess some drivers might not notice it depending on the road conditions, but it gets better/worse depending on air temp, tire temp, etc. They've re-balanced the driveshaft, done road forces, switched wheels, etc, but thankfully they finally were able to condemn two tires. It is most noticeable at speeds of 70km/h up and generally gets worse at higher speeds. Sometimes the entire car shakes, sometimes it is felt in the steering wheel, sometimes both. Just glad the dealership is not giving up and won't give up. There are many other posts online pertaining to this on G8's, which is interesting. Are you having the same problem? Ryad

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