I researched the source of a 500 Hz vibration at idle, mostly in the cab and I think I've located it as being the exhaust resonator touching the frame.
The questions are:
- Will replacing the struts increase the clearance between the resonator and frame.
- Do the helical springs loose their springiness and collapse, making the repair above ineffective.
- How do I tell if struts are "leaking" ? everything looks pretty oily
Notes:
- I replaced the front motor mount which was chewed up.
- The other two motor mounts appear intact.
- Engine size = 2.6L
Thanks for your help.