I have a ticking sound coming from the engine compartment, but I'm sure it is not the motor itself.

What is your question?

The ticking sound is almost non existent when in neutral, but once in gear the ticking is much more pronounced. It's not loud and isn't always present. It comes and goes but always comes back. I hear it more when a car pulls up along side of me. What do you think it is. Today the mechanic tightened down the torque converter bolts. After that process the noise is still there. Please help me with some ideas. If anyone has experienced this issue please let me know what it is?