Pontiac Repair: trans am belt noise, componant, idler pulley

Question
my car makes irrating noise were my belt is when i am driving. i tried putting some oil on my belt and its works for like a week and it would starting making that noise again. i think its the pulley pbut i am not sure. what should i do?

Answer
could be a bad idler pulley, tensioner, or componant, need to try to isolate the noise, carefully with a long screwdriver, touch the alternator and water pump and rest your ear on the handle of the screwdriver and see if the noise you are hearing transfers through the screwdriver