Does it sound like a thud under your center console?
If it's not diagnosed properly, you'll get nothing but a guessing game. If it's outside, the only way to do this is either using a dyno platform for AWD (preventing the differential jerking effects from occurring), or jack it up all 4 and slowly accelerate. The thudding sound has various areas:My 2008 Treg with nearly the same mileage makes the exact same sound and has done so for at least 40k miles. It is definitely not the driveshaft center bearing as I've replaced that support recently and nothing changed. It is definitely NOT inside of the passenger compartment either. I have wondered for awhile if it is a motor mount failure. Mid-winter when it is cold here (Northern Wisconsin) the sound does not occur nearly as often. During warmer months it happens all the time.
Start a new thread for more viewsI have this exact noise on my ‘08 3.6. Has anyone figured out where it comes from?
The a/c line was rattling against the body of the car. There actually is a tsb for this very issue. The sound is now gone.Start a new thread for more views
Awesome follow-up!The a/c line was rattling against the body of the car. There actually is a tsb for this very issue. The sound is now gone.