car makes loud rattling noise after I started the engine

Hello, I'm not sure what could have happened to cause this kind of result unless something inside the engine became a problem. It will take some hands on testing to find out what is going on. Do not run the vehicle further until it is tested, as damage may be occurring by trying to operate the vehicle. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops