My '05 Yukon begins pinging/clanging loudly from the undercarriage (possibly the muffler) after driving for about 10 minutes. After driving, the pinging continues for some length of time, depending on how long I was driving.
I live in the south and the problem began a couple of months after a winter trip to Chicago, complete with snow, ice and salt, and I failed to wash the undercarriage when arriving back home. There are some rust “freckles” on the frame and axle, but nothing on the muffler; the drive shaft is completely covered in rust. Could rust be the issue?
Any suggestions? Thanks.