I've bought the correct parts from the Honda dealership and talked to the service people at the dealership and there is no PCV valve, I've also owned two civic VX's and talked to other VX owners and there is no PCV valve, it is all empty tubing, I've installed a PCV valve on my VX as well to see if it changed anything and it ran poorly at low RPM.
The one area I have had trouble with the stock set up is that after 15 years the rubber grommet on the breather box, under the intake manifold, that grommet dries out and needs to be replaced, it takes someone with very small arms to get in there, it's easy to tell if that grommet is bad because at idle your engine speed will bounce.
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