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Message: <blockquote data-quote="Tico007" data-source="post: 24576" data-attributes="member: 7026">19. The buildup of moisture/liquid in the air box and in the fresh air PCV tube is a clue that the internal PCV orifice is likely blocked. Hot blow by is reversing direction and pushing out the fresh air tube meeting  fresh cool air coming in. That’s how the moisture is created. It’s basically raining. It’s a common problem with the 2.4. Likely the problem with the former engine also.The internal PCV orifice design worked until GM changed to direct injection. Now without the wash of fuel vapors near the intake ports the PCV orifice hole blocks with carbon from blow by. Another clue would be check for a lot of pressure coming out the oil filler cap at idle. When the PCV orifice blocks, it causes pretty much all the problems with the engine, including oil consumption, timing issues, vacuum/fuel related issues from the pressure created. You can also have problems with the secondary air system if you have one because of the moisture, that will show itself with a rough idle the first 15–20 seconds. The pressure can also blow the rear main seal.There are options to less than the impact of blockage. You can drill an external hole through the intake manifold as a way to maintain the internal orifice. Or you can do what GM decided to do in the most recent engine designs. Go back to a traditional PCV valve. It can be done. It’s what I do. I’ve tested an orifice bypass on several 2.4. No issues. It’s pretty basic actually and doesn’t cost much to do. The traditional PCV valve keeps blow by headed in the correct direction. Cold air coming in one side. Hot blow by exiting through the other side. This helps with the moisture problem. With less blow by the oil stays cleaner, oil is less likely to plug the the VVT solenoids, and so on.</blockquote>

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