Another IMRC "stuck" thread.
I know there are some IMRC stuck threads already, and I thought about popping an old one to the top. But it seems like (on other boards, at least) you get as much abuse for reviving an old thread as you can for starting a new one on a subject that's already been covered some. So I went with a new one instead.
My wife's Focus popped a CEL a few days ago with code P2004 thrown, so I knew it would be manifold related - either tumble flaps or (being as this is a D23 IM) the runner control system. Starting the car, I observed correct operation of the tumble flap control valve, and it seemed like there was good vacuum. So no worries there.
Turning my attention to the runner control system, I first pulled the short vacuum line from the intake side of it's solenoid. There was a loud clunk from down deep inside the manifold and I'm like, "Hmm...I guess that must have been runner moving." I checked the vacuum lines and they all seemed OK. So, since I had a spare pair of solenoids, and they are the easiest parts of the system to get to, I changed the one out for the runner control system and we'll see if it solved the problem. I also have a spare actuator, and will change that out if we run the car up and the CEL comes back. Unfortunately, I wasn't able to get the car out into the neighborhood yesterday, and I don't think driving around our small block got the speed/revs up sufficiently for the runner to move.
I guess I'm confused about the physical form of the runner itself. It's clear there it's something inside the manifold that the actuator moves. But what? And is it likely to be sticking, or is it the collective experience here that it's far more likely to be either the solenoid or the actuator? If it does turn out to be the runner sticking, I'm guessing the IM has to come off? Can it then be cleaned (I'm guessing it would be carbon making it stick) or do I have to chuck the manifold away and get a new one?