Got a fuel pressure gauge? If you do then connect it to the fuel pressure regulator. If no pressure then turn the key on about 3 times and let it sit for 10-15 mins. It should be between 35-50 psi with the engine off. Make sure it does not drop in pressure. With the engine on it should read 25-40 psi. Other than that I do not know much about your issue without being there. When it makes noise what noises does it make? A chiming noise or something else? If its a chiming noise then it could be your ignition switch moving down far enough to make the car think the key is still in the ignition. Thats what mine does on occasion. Maybe someone with more knowledge could help with your PATS system. Also have you inspected your ignition system lately? Has it been tuned up within the last 60-100,000 miles?