Torque down your spark plugs. happened to me and that's all it was, couple plugs were a little loose. if that doesn't stop it i'm sure someone else will have a suggestion.
sweet man. glad it worked out for you. I remember that noise driving me nuts and i fixed it almost by accident. i was checking the gap on my plugs and noticed that a couple unscrewed way too easy so after i torqued em all to spec, Boom, problem solved.That fixed it. I haven't gotten my new plugs yet but the chirping was getting louder and I wanted to make sure I didn't give myself a problem because I was lazy. Here is a picture of the coil pack. You can see which one was too loose. I torqued the rest tighter just to make sure.