my jeep xj has been smelling really bad and a little bit of smoke when i get out of it. its coming from the engine bay. i was low on coolant (very low) so... idk where to start. i filled the coolant back up and it hasnt moved for 5 days... what do i do? i have no codes for the engine at all...

It all depends... What does it smell like, Does it smell like oil or coolant?

Replace the valve cover gasket and oil filter adapter o ring.