Connect the dots:
1. Chammy (my 110) has three idle speeds; 400rpm, 800 (chip designated normal) and 1100. The selction is random with no pattern, and whatever speed she starts with stays that way for the duration of a run. ie: Every time I turn on the key and start up, the idle will be one of the three and will stay in that 'setting' until the ignition is switched off.
2. Sometimes, their is also a low-volume high-pitched rpm-related whine that comes out of the passenger front speaker no matter if the radio is on or off. Stays that way until ignition switched off.
3. When the idle rpm is in the 400 'mode', there is sometimes (but not always) a steady whistle (not rpm related) coming from behind the plenum (can't track it precisely -- like a ghost it moves away when you get close). Doesn't seem to connect to speaker noise in #2.
None of the above effects performance in any way. Power curve is strong all the way to 5000 rpm. It's just an annoying weirdity....
For you guys who like solving puzzles!