Once you install all the new hoses to the proper locations on the catch can and the valve cover and cylinder 1 intake, you need to do something with the old ccv. You have 2 options here. Option 1: remove the entire ccv unit, and the hose that runs down the the bottom of the oil dipstick.
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It is a biotch to remove though, but you can make it extremely easy on yourself by just cutting the hoses on the old unit to remove. Add some assembly lube on the new fittings and install should be a breeze. Also clean out all the oil that are in the vaccum runner ports on top of the intake manifold.
Could be valve cover (no leaks) or crankcase breather/vent hose located between the valve cover and connection under the intake manifold. Part number 11157559528. I was thinking about replacing the hose as a PM. Cost is cheap $35 OEM or $52 OE.
SeanC. 6012 posts · Joined 2007. #8 · Feb 23, 2009. I have been getting the exact same symptoms on my 5er. Cleaned the ICV (helped a little with the speed of the idle, increased it a little bit, but that's it), changed the O2 sensor, but the problem remains. The cause as found by my mechanic is a vacuum leak from the throttle body gasket in
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bmw e46 ccv valve symptoms
