Well, there is a proper PCV valve on those lines, assuming you're playing with the right ones (the ones that run to the pair of outlets on the front of the intake manifold). Maybe the valves have gone bad?
I do run an Al catch can way over in the battery compartment, but I wouldn't think the relatively small volume of hot PCV air would be a significant factor anyways. An actual failed PCV valve could cause all kinds of problems, though.
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