Ok let me answer both of your problems.
The tick noise you are hearing that's coming from the steering column is normal. The sound is not from the air bag wire, so I don't know why the hell the dealer replaced that for no apparent reason. The tick noise is the steering's rack and pinion. This noise is normal on all 2009-2010 FX's. Mine makes the sound too. I've tested 7 other brand new FX's on the dealership's lot and they all make that sound. It's normal trust me.
Second, the ticking/clicking noise you are hearing at 2-3000RPM is not from the engine. It just sounds like it is, but it's not. It's actually coming from the driveshaft. There is a Technical Service Bulletin (TSB) on this issue:
Here it is:
ITB08018
- IF YOU CONFIRM: A "clicking" noise is coming from the left and/or right rear axle (driveshaft) when accelerating from a stop, NOTE: If any other types of noise are observed or heard under other conditions this bulletin does not apply. Consult your Asist service information for any other issue. ACTION: Remove both left and right driveshafts, clean the flange surface of the outer joints on the driveshafts and apply a specific amount of Molykote M77 grease. Refer to the Service Procedure in this bulletin for details. NOTE: This is the only approved service procedure to repair this incident.