The BMW Engine Adventure
Please wait a minute or two for all the images to load ...
The engine with the intake removed
This is the reason for removing the intake, the tube has an 'o' ring inside that cannot be changed with the intake manifold on the engine. You might be able to able to remove the throttle body, but that too is pretty difficult with the intake on the engine as well. Easier to just remove the intake manifold, besides, this way I was able to clean all the oil out if it.
The Throttle body removed and cleaned
The intake manifold removed from the engine
Note the brass inserts in the plastic housing
The failed crank case vent valve, there is a diaphragm inside this that fails. When this happens, the engine will run very roughly due to a lean condition caused by outside air drawn in through the engine seals as a result of excessive vacuum. This will be accompanied by scary amounts of whitish/blue smoke.