I had a ticking sound coming from behind me also, which was in the engine somewhere. I could never find out what it was so decided to go to the mechanic. They opened the engine compartment and found out what it was (at no cost). They even let me listen using the mechanics stethoscope. And low and behold it ended up for sure being a few of my fuel injectors being a bit noisy. I ended up getting a bottle of Chevron Fuel Injector Cleaner With TECHRON and it quieted the injectors down a bit.
If you can hear the sound being louder when you put your ear up to the side vents, it might just be the same problem.
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