Noises can be hard to track down. I have a couple different systems, a chassis ear that uses piezo sensors to "listen" to vibrations from loose/worn parts and a couple cheap digital recorders that I set in the area of the suspected noises.
For the noise you have. Toss some weight in the rear seat and see if the noise changes or goes away. It could be the seat retainer clips or something loose under the seat. It could be that the other noises masked it and now you hear it because they are gone.
It is also possible it is something in the trunk or in the door and it is telegraphing the sound.
You can also just feel around and push/pull on the trim, seats etc and see if something is loose.
Tuesday, March 27th, 2018 AT 10:09 AM