Besides the engine, what else do you have running? Is your fan running? Heat, or A/C? Is the noise present at engine start-up, or only after the car has been driven? Is it consistent, i.e. always on? Can you tell if the engine's exhaust fan is running? Any modifications or recent work done to the car?
If might also help to pop the hood to pinpoint the source of the noise a bit better.
There is nothing else running, no AC, heat,etcBesides the engine, what else do you have running? Is your fan running? Heat, or A/C? Is the noise present at engine start-up, or only after the car has been driven? Is it consistent, i.e. always on? Can you tell if the engine's exhaust fan is running? Any modifications or recent work done to the car?
If might also help to pop the hood to pinpoint the source of the noise a bit better.