Most of the time I empty my can every 7-10 days and there is aprox 1-2 inches of a mixture of water and oil
( mostly water)
You can start your car without the MAF sensor plugged in (and drive if you want) and if the idle surge goes away you may want to clean or replace your MAF. If you unplug the MAF and start or drive the car you will want to clear any error from the unplugged MAF.
I'll try unplugging my MAF today. I did already pull and clean it, however it very well could be on its way out.
7-10 days still seems excessive, but I'm no expert. Consider this... With the intake hose in place, I haven't collected an inch of fluid in a couple thousand miles, but the catch can is still functioning under boost when it is suppose to be needed the most. Maybe someone with a catch can other than the ECS system can chime in, but when I was looking into the apr setup I believe it said you needed to drain the can yearly. I don't understand where this huge difference in fluid collection is coming from. In my experience with my can, most of it is water but there was also enough oil in there too notice a drop in oil level over a longer period of time.
Edit: I disconnected my MAF and my car was ok for a couple hours before it began idle surging again.
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