Burning smell from under the hood ?

Small coolant or oil leaks could be the cause without any drops hitting the floor. The splash pan under the engine can hide a lot.

Hmmm.... Check if there's oil seepage from the front engine cover (cam cover) that drips down and is blown back onto the hot exhaust. It's a bit of a painful 10hr job. Otherwise, assuming the CVT is "happy," I'm at a loss. Some serpentine belt stretch will cause low rpm belt arhythmic"chirping" that's annoying, but of no consequence unless it stretches enough to slip and get a bit smelly as it burns? Just conjecture....