Yes, it is. Im laughing my a$$ off here! The guys saying, "We do too have a PVC" are the BEST! Thank you so much for making me laugh and putting me in a better mood.
Like MOST people have mentioned, our I6's dont have PCV valve(Yes, thats P...C...V....VALVE, which stands for positive crankcase ventilation valve, not PVC like polyvinyl chloride which is a thermoplastic polymer). A PCV valve is just that: A VALVE. It reacts to changing pressure and allows the correct amount of gases to flow to their intended destinations basically. Our Jeeps (most of them anyway, I dont know everything about every XJ ever made) have a CCV which stands for constant crankcase ventilation, which does just what it says: Its an open line that allows the crankcase to constantly vent. There is no valve in it, the "V" does NOT stand for valve, it stands for VENT as in VENTILATION.
Now, do people call it a PCV, yes. Are they wrong: YES! You CAN NOT tell from looking at it that it isnt a PCV, they look alike. A large elbow and hose is all you can see from the outside, but they are TOTALLY different inside that elbow. When you go into a parts store and you ask them for a Jeep 4.0 PCV, I bet you ANYTHING they wont find it in their computer. Its not there. If it is, the person who put it in there as PCV and not CCV did so incorrectly. And I have yet to find a NAPA or Car Quest or VIP or Advance Auto that has our CCV. At least the ones in Maine that Ive called dont have them. I recently had to buy one from the dealer.
Great thread guys, keep it up!