Cadillac Owners Forum banner

1 - 9 of 9 Posts

·
Registered
2005 CTS-V
Joined
·
26 Posts
Discussion Starter #1
Hi All:

I have a 2005 CTS-V (LS6) with approximately 120K miles.
For the last 5K miles or so I have noticed a driveline vibration that has been very difficult to isolate. This began (coincidentally or not) with a right rear wheel bearing that needed replacement. The rear diff noise vanished with the new bearing but the driveline vibration remains.

It comes on at approximately 15-20 MPH, recedes and then comes on again at approximately 40-45 MPH. It is more noticeble when lifting off and is virtually gone by 60-65MPH.

I have naturally ruled out wheel balance issues. The clutch / pressure plate is likely original although it is possible that it has 100K miles since I purchased the vehicle at 24K and the rear differential had been replaced by Cadillac at approximately 19K.

A local tuner seens to think it could be an engine balance issue. Aside from the vibration the car runs great. There has been no loss in mileage or performance. The clutch does not slip or chatter. The engine and trans mounts are all in good condition as is the drivesharft and u joints.

Has anyone runs into this? The vibration is driving me nuts.

Thanks, Paul
 

·
Premium Member
2005 CTS-V
Joined
·
8,363 Posts
The Service Manual has no fewer than 50 pages dedicated to vibration analysis. See attached.
 
P

·
Guest
Joined
·
0 Posts
Does it vibrate when you are standing still and just revving the engine?
 

·
Registered
05 Stealth Gray CTS-V, 08 Light Platinum SRX V8, 05 White Diamond STS4 V8 1SG
Joined
·
2,105 Posts
Based on the speed ranges you reported, it seems likely that the flywheel is tired.
 

·
Registered
2005 CTS-V
Joined
·
26 Posts
Discussion Starter #6
I'm thinking that is the most likely cause too. Besides at 120K, it's definitely time for a new clutch, pressure plate, flywheel anyway.
Thanks for your comments.
 

·
Registered
Cadillac
Joined
·
402 Posts
i also have a drive line vibration and yes the flywheel has been changed with clutch motor mounts. after my mounts this started to occur!..
 

·
Registered
2010 Cadillac CTS-V
Joined
·
268 Posts
Based on the speed ranges you reported, it seems likely that the flywheel is tired.
Yea, I heard this will happen when the dual mass flywheels start to have problems.
 
1 - 9 of 9 Posts
Top