Corolla 9th Gen/1st Gen Matrix (2003-2008)
I have an '04 Matrix XR, 5-speed manual with the 1.8L 1ZZ-FE. It's got 174,400mi on the clock, and ~1,500mi/3 weeks ago on a cross-country road trip it started developing a noise/rattle in what I think is the top-end & that I believe to be piston slap. It doesn't go away once up to operating...