Deep rumbling at 65mph

[Dan_T]

Hi all, I recently purchased a 2018 Stinger 2.0T (was instantly sold once I test drove the Stinger after the 2021 Mazda 3). Discovered a bent rim that the dealer gave me some credit towards a new set of aftermarket wheels. Since installing the new wheels and tires, the thumping/seat vibration >60mph certainly improved.

However, I notice that from a cold start at 40mph there is still a thumping noise (at front?) that goes away once the car is warmed up. Then at 65mph there is a deep rumble (almost like <30Hz on a subwoofer, or the sensation with air pressure with the back windows open).

If prior owner hit a pothole/curb, where else should we be looking for damage? Or any other causes come to mind? Odd that its only noticeable at certain speeds. Dealership tech confirms he hears it, and apparently worsened after they switched a new set of OEM rims from another Stinger. They still have my car for a second day to further diagnose while I'm driving the new K5 as a loaner (which surprised me with the peppy 1.6T)

 

[MerlintheMad]

Howdy and welcome. If you're working with someone who'll remove wheels from one of their other cars to track this down, you're in good hands.

 

[stoopid]

Wheel bearing? Do you notice anything making turns?

 

[Dan_T]

Wheel bearing? Do you notice anything making turns?

No issues on turns normally. Do notice a subtle knocking sound coming from the front driver's side when steering is turned going over bumps and entering driveway but not when going straight over a speed bump

 

[stoopid]

No issues on turns normally. Do notice a subtle knocking sound coming from the front driver's side when steering is turned going over bumps and entering driveway but not when going straight over a speed bump

That unfortunately could be the bearing, is that the tire location that was damaged?

I come from mostly owning GM cars in recent years, wheel bearing and speed sensor issues are common with them. ANY thunk heard or felt in the steering wheel when turning is a symptom.

 

[Dan_T]

That unfortunately could be the bearing, is that the tire location that was damaged?

I come from mostly owning GM cars in recent years, wheel bearing and speed sensor issues are common with them. ANY thunk heard or felt in the steering wheel when turning is a symptom.

Its a good thought. Since it was that subtle, not sure how they'd go about diagnosing that without just randomly changing parts.

An update (in case someone finds this on google): they seemed to reproduce the same thing on the new stinger on the lot and basically said they don't know. In any case, time will tell if it worsens. Appreciate all your help!