1999 Toyota Camry engine knock

My friend has a 1999 Toyota Camry CE, 5speed, 155, xxx miles, 4cyl. She recently told me that while coming off the highway the vehicle stalled out. After pop-starting the car to get it back going while coasting, a severe knock from the block or head developed. Upon checking it this afternoon the car starts with minimal effort and runs ok but making a very loud ticking/knock. Unfortunately my diagnosis skills are no good for toyotas and we have no idea what it could be. Im thinking that because it starts and doesnt shake like its out of time its not the crank or the cam(s). Any advice that you can give me as to what the problem is and how it can be fixed would be great. Thanks in advance