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<blockquote data-quote="Tico007" data-source="post: 20952" data-attributes="member: 7026"><p>This engine uses a fixed orifice PCV system. Nothing wrong with that. The problem is the location of the orifice. Someone at GM made the assumption that because fixed orifice does not use a mechanical PCV valve, there is nothing to be serviced, just stick it inside the manifold. Well, that wasn’t the best idea. The orifice can plug with carbon from blow by. Once the orifice hole is plugged, blow by has nowhere to go. Pressure builds. That pressure prevents the rings from sealing on the cylinder wall tightly which can lead to oil consumption. Or blow the main seal. Or come out the clean air intake tube. You know that’s happening if the clean air intake side has milky foam. It should never have that. People put catch cans on the clean air intake side to try to prevent moisture from clogging the clean air intake tube. Or put on the FC219 cap to relieve pressure. None of that fixes the problem which is a blocked orifice. A google can explain different ways to poke the manifold orifice hole. Don’t want to do that all the time so I’m going to create a external orifice mod. The parts are on order. When I get it set up, I will show some pictures.</p></blockquote><p></p>

[QUOTE="Tico007, post: 20952, member: 7026"] This engine uses a fixed orifice PCV system. Nothing wrong with that. The problem is the location of the orifice. Someone at GM made the assumption that because fixed orifice does not use a mechanical PCV valve, there is nothing to be serviced, just stick it inside the manifold. Well, that wasn’t the best idea. The orifice can plug with carbon from blow by. Once the orifice hole is plugged, blow by has nowhere to go. Pressure builds. That pressure prevents the rings from sealing on the cylinder wall tightly which can lead to oil consumption. Or blow the main seal. Or come out the clean air intake tube. You know that’s happening if the clean air intake side has milky foam. It should never have that. People put catch cans on the clean air intake side to try to prevent moisture from clogging the clean air intake tube. Or put on the FC219 cap to relieve pressure. None of that fixes the problem which is a blocked orifice. A google can explain different ways to poke the manifold orifice hole. Don’t want to do that all the time so I’m going to create a external orifice mod. The parts are on order. When I get it set up, I will show some pictures. [/QUOTE]

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