WARNING!
To avoid personal injury or death, disconnect your appliance from its power source
before you start any troubleshooting or repair work. Use caution when working inside any appliance.
It is possible that your oven has accumulated a buildup of grease that is now burning off. Another reason could be that the broiler pan is upside down and enabling the grease drippings to burn up from the broiler. You should also make sure to give the meat enough clearance from the flames.