2012 Hyundai Sonata 2.4 MPI engine rattle


Hi Scotty! Love the show. I drive a 2012 Hyundai Sonata 2.4 MPI (Korean made) with a 6 speed auto. It has about 48,000 kilometers on it. I hear an loud rattle whenever I accelerate hard or go up a hill at around 3000-3500 rpm. Could it be engine knock? It doesn't happen when I gradually press on the pedal and build the revs, only when I'm aggressive on the throttle. Thanks!