First, I wanted to let you know I really learned a lot from this forum about my Outback, and solved many problems just by searching for posts. But for my current problem I need to ask you for help:
Whenever it is cold outside (-10 F or colder), the starting procedure goes like this: turn ignition to start, she fires up, but surges between 600-15 rpm at idle. CEL will come on and clicking noise (relay?) from under the glovebox. The clicking noise correlates to the rpm, meaning when the rpm goes up, the clicking becomes faster. Turn ignition off, then start again, and idle is constant (around 900 rpm), but CEL on and failsafe mode (max rpm 1100). CEL is triggered by Code P0607 (=Control Module Performance), no other codes. Erase codes, start her up, she runs fine, no CEL, no surging, no clicking. She runs fine all day long until the next morning when I wake her up after a cold night.
My thoughts are I am dealing with a bad ground/wire here, but where? And what relay makes that clicking noise? From another thread I copied the schematics of the relays under the passenger side dash, but I am not sure if I can ID the noisy relay (it is quite cold and pretty dark in the morning, too).
I also had a couple times the airbag light on after cold start, that goes together with the turn signals not working and the outside temp display showing some weird symbols. But it just takes a another start to make that go away.
Any hints as to where to start looking/pulling things apart are welcome!