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Old 11-01-2017, 06:35 PM   #1
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E46 Excessive crank case pressure

Thank you for looking at this post! I will give a short topic point to help any one who may have quick and easy information, then I will proceed to post detailed information about my E46.
--2001 330CI 3.0L
-valve cover gaskets full set felt pro
-rebuilt the VANOS
-fuel pump
-fuel fileter
-coils x6
-plugs x6
-x4 02 sensors
-CCV Delete (thinking this is the issue)

My delete is a tube running to the intake 1" reduced to 5/16 @ intake. Im getting p0174 and p0171. Do I need to "vent" the crank case? This inst the best information please work with me. Im not great with words.

I feel like I have excessive crank case pressure. This is my second E46 and I don't recall my last car having pressure like this. I just feel like I'm getting a lot of blow by. I am thinking the rings are bad and on my last leg about buying a cylinder leak down test. THE THING IS!!!!!! I am told that the pressure will blow out my seals. That it needs to be parked ASAP and i drove it for a year as is.. Any one have any information about this type of problem. the car is 120k miles and from a one owner.
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Old 11-25-2017, 12:24 AM   #2
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Did you already do a compression or leak down test? If not get a leak down done so you can identify what the issue is. It sounds like you have a leak based on your symptoms. It most likely won't matter how you are venting at this point but you can try venting straight to the atmosphere to help with the lean issues due to too much blow-by being sucked back into the engine. Keep in mind if you do this you will have smelly fumes that will make it into the cabin.
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Old 12-22-2017, 02:36 PM   #3
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Ive been looking into doing a ccv deltete for my soon to be boosted manifold. The ccv will be completely removed. I will be fitting a catch can. One connection of the catch will be connected to the crankcase. The other connector will have a filter connected. So any sludge from the crankcase will be collected in the can and it will allow the crankcase to vent to atmosphere. Apparently if the filter is positioned well , smell is not an issue.

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Old 12-22-2017, 06:46 PM   #4
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Location: Miami
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Correct, a healthy engine venting to the atmosphere is common (mine is set up this way also). Difference here is the OP implying he has a bad leak allowing the combustion chamber to leak excessively into the crankcase...
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ccv, crank case pressure, e46, p0171, p0174

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