PCV valve check

[tridentt150v]

I was using a bit of oil so decided it was time to look for solutions [motor is still healthy], so I'm pretty sure its nothing to do with that.

I took the PCV valve out and sure enough I could blow easily through both ends.  I squirted some brake clean in it a few times and some black crud came out, blew it clean, squirted with a small bit of silicon spray, and it seemed to 'fix' the problem.  But I can still blow a tiny bit back, so I don't have a perfect seal.  Blowing forward is no problem = full flow.

I reinstalled [its not a big job to remove or replace], I will likely order a new one anyway, but was just wondering how good do they actually seal? 

My question is should you be able to blow back through the valve at all?

[666DAN]

Technically no, but they aren't the best construction. A trip to the wreckers may find a fresher example on a later model maxima or pulsar.

[tridentt150v]

Ok, thanks Dan.  I'm told they are only $35 at Nissan anyway, so might get new.

And yeah, you're correct, only a plastic thing, so not really made to last forever.