dont know if it will be the same thing but on my lcr there is a light tappy noise, what it is is the little black box on the drivers side of the engine bay right next to the power steering fluid resevoir, not sure on specifics cause i aint a mechanic but this box recycles fuel in some way (according to a mechanic, it was something like that anyway, fuel or exhaust or something, something about filtering/cleaning it)
anyway it ticks away at times but this is apparently OK, be easy to tell if your tick is coming from the same place, just have a listen! (whilst engine running, but not wearing a tie or scarf lol)
if you struggle to find it il take a pic and post it, id give a better description but stuck in office at the mo
also if anyone can explain to me exactelly what the box im on about does id be grateful