My '21 TB has developed a weird grinding/rattling noise under light acceleration between 1,200-1,500rpm. Doesn't matter the transmission gear or vehicle speed. My only way to describe the noises is it sounds like a heat shield rattle I had on my old '03 f150. I crawled my biga$$ up under and cannot find anything loose & the noise does not happen while parked. Any ideas before I take her into the dealership?
