Water in the oil

[ruskie34e36]

Originally Posted by JCL

You are cleaning out all the paste in it, and in the lines. Also inspecting the lines to see if any have gone soft. In some CCVs (I don't think all of them) there is a replaceable rubber diaphram that BMW sells a repair kit for. You would have to take the CCV off to clean it properly, so most just replace it after having done that much work.

Doing a hot oil change doesn't clean out the CCV, since oil doesn't circulate through it, only crankcase fumes.

Isn't there a test for the CCV (very strong vacuum at the filler cap or none at all?) My question is whether or not theres a way to find out if you're in danger.. Ive seen most (i think) posts about the ccv here, but its mostly about replacing one. Its not exactly a cheap fix..
One detail - also once in a blue moon, and completely unpredictable, usually when Im out of town - car will start up and run rough. Sometimes check engine light comes on. Let it sit for a couple days, starts just fine, smooth and no light. Can't remember the last time it did this, but thought it might be a symptom...