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2013 w204 c250 - Crankcase pressure with oil cap off m271 evo
Hi everyone. I’ve been trying to solve this crankcase pressure problem I’m having.
With the car running, when I pull the oil cap off there is (what I believe to be) excessive crank case pressure.
I replaced the pcv system hoses and check valve that is under the intake manifold and that goes into the block of the engine and hooks into the vacuum lines.
looking for any other suggestions of what else could be causing this crankcase pressure. Bad EGR? Turbo seals blown?
the car runs fine, idle isn’t rough, power is all there. CEL is on for MAP/throttle body sensor positioning. Other than that I’m lost.
I have successfully installed the new VC an can chalk it up as a success
my car no longer bobbles and blows the oil fill cap all over the place while resting over the fill hole at idle.
it has its suction (vacuum) back at idle and pulls the cap into the fill hole as it should.
Low rpm/slow driving seems much smoother now. Take off and accelerate are much smoother also. This is just from the ride home first impressions.
I would say if you are suffering from multiple oil leaks and are suffering from any or all of the symptoms I’ve listed above, you SHOULD REPLACE YOUR ENTIRE VALVE COVER.
here are a few pics of the valve cover off and the new one on. Will post videos shortly.
Did replacing the valve cover fix the oil leak or did you eventually have to do the Oil Filter Housing + Gasket?
@c250benzjh - hey, yes I did end up having to replace the oil filter housing. That was the main culprit for the oil leak.
however, my valve cover was leaking. The gaskets for the spark plugs/ignition coils were leaking. Some of the spark plugs had oil on them when I pulled them out.
it was worth replacing the valve cover to have a new high pressure PCV system and new gaskets.
@c250benzjh - hey, yes I did end up having to replace the oil filter housing. That was the main culprit for the oil leak.
however, my valve cover was leaking. The gaskets for the spark plugs/ignition coils were leaking. Some of the spark plugs had oil on them when I pulled them out.
it was worth replacing the valve cover to have a new high pressure PCV system and new gaskets.
ant
Did you originally have a plastic valve cover? Can I ask what valve cover you bought? do you think that was necessary or you could just do the gaskets. Seems like most people just replace the gaskets and keep the original valve cover. I can't seem to find any info on why replacing the valve cover would matter unless it was cracked.
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