Definitely not a valve. Pulling straight air out of the valve cover. How oily was the throttle plate?

 

EXTREMELY OILY:


It is now spotless.

Codes are: P0406 and P0108.

That "plug" piece does move around a bit while sitting in the engine block though, which is probably why there is a bit of seepage around it. Could that be causing a vaccum leak?

 

Shouldn't be a valve though? Is there disadvantages to it pulling straight air?

 

It's not really a plug, it's design designed to burn hot oil fumes created inside the engine. Cars in the 60s used to have a little cap on the valve cover with some mesh in there but the fumes would vent directly to atmosphere. Then PVC came along. Yes, if it's sucking clean air then that would be considered a vacuum leak. You could test by plugging the hose going to the intake and leave the PCV 'valve' open to the atmosphere to see if the rough idle goes away. Just make sure you plug the hose good so no air leaks or you'll not be ruling it out as a source of vacuum loss.

 

It does seem odd that it would be a straight pass through but it might be the case that it's supposed to be that way.

 

The best diagram I could find of a PCV shows that it is similar to the straight through pipe you have, but with an electrically operated valve in the middle.
PCV VALVE | Genuine Land-Rover | 4665256

Your car was obviously supplied without a valve.

The fact that the short connection pipe is loose fitting might indicate the it needs a new 'O' ring. If it's not sealing properly unmetered air can leak into the system and give rise to rough running as the system tries to compensate for the detected additional air which might show as a lean mix.

Run a diagnostic and if it indicated a lean mix this could be the, or one of the, causes.

 

Yep. That's the part that I ordered because it's supposed to fit my v6 4.0, but I can't find where it would plug in. Now I just have this part sitting here.

 

You don't see a random disconnected connector anywhere?

 

Honestly, I haven't given a good look. I had to put it all back together because I need to drive it to get new tires. I'll take a look today.

 

I wonder if someone swapped the engine out. If you can't find any corresponding electrical connector, then you may want to try to find the engine numbers; also look at the ECU part number. That should tell you something.