My wife and kids noticed the subtle clunking sound when accelerating or flexing the frame during the first month of delivery. On the first inspection by the service crew they claimed they couldn't replicate the noise and suggested the rear passenger door frame welding may be impacted and making that noise. The recommended they would take the Y to a certified body shop and rework the welding as the resolution. I didn't buy that explanation and requested their most senior technician look into this. It was worth the wait as after two weeks in the shop this is what they found:
"Technicians test drove and verified a loud popping noise was present when the chassis was flexed. Technician raised vehicle and, upon inspection, found the right rear shear plate bolts were loose, allowing the plate to pop against the threads. Technician performed thread repair to ensure good torque retention. Technician installed bolts to spec with threadlocker. Technicians test drove vehicle once again, but the noise was still present. Technicians raised vehicle and found the front right rear subframe bushing appeared to be allowing the subframe to contact the body, causing the noise. Technician presented findings to service engineering, who advised replacement of the rear subframe. Once the rear subframe arrived, technicians lowered the rear subframe assembly, exposing the superficial galling present on the chassis subframe mounting points. However, when inspecting the respective mounting points on the rear subframe, no indication of interference, such as witness marks were present. Technicians once again presented findings to service engineering, who suggested the chassis may have had debris present from manufacturing which has since cleared. Technicians were instructed to thoroughly clean the mounting points and reinstall the subframe assembly to test. Technicians reinstalled components and performed a test drive. Noise was no longer present. Technicians reassembled vehicle and performed four wheel alignment."
Long story short, rear sub frame wasn't mounted properly as they suspect debris may have been present at the time of manufacturing.
let me know if you all had similar issues... but just sharing what was done to my Mod Y to resolve the issue.
thanks,
Robert
"Technicians test drove and verified a loud popping noise was present when the chassis was flexed. Technician raised vehicle and, upon inspection, found the right rear shear plate bolts were loose, allowing the plate to pop against the threads. Technician performed thread repair to ensure good torque retention. Technician installed bolts to spec with threadlocker. Technicians test drove vehicle once again, but the noise was still present. Technicians raised vehicle and found the front right rear subframe bushing appeared to be allowing the subframe to contact the body, causing the noise. Technician presented findings to service engineering, who advised replacement of the rear subframe. Once the rear subframe arrived, technicians lowered the rear subframe assembly, exposing the superficial galling present on the chassis subframe mounting points. However, when inspecting the respective mounting points on the rear subframe, no indication of interference, such as witness marks were present. Technicians once again presented findings to service engineering, who suggested the chassis may have had debris present from manufacturing which has since cleared. Technicians were instructed to thoroughly clean the mounting points and reinstall the subframe assembly to test. Technicians reinstalled components and performed a test drive. Noise was no longer present. Technicians reassembled vehicle and performed four wheel alignment."
Long story short, rear sub frame wasn't mounted properly as they suspect debris may have been present at the time of manufacturing.
let me know if you all had similar issues... but just sharing what was done to my Mod Y to resolve the issue.
thanks,
Robert
