Back in 87 there is three different ports on thw valve cover the one in the rear closest to the fire wall is the pcv and its not even a true pcv its hose that goes to the manifold that's it the one in the middle is the oil filler cap and the one closest to the front end is a breather it waS manufactured that whay that year its a breather that goes to the back of the air box that's how it was made and you can't plug it you'll ruin the motor I'm not trying to make a breather its just for the blow by its a catch can people don't add them to the motor that's how they were made I was asking a question so don't post on my thread unless you know what you are saying
The original hose was routed to the intake via the air cleaner. This is called a closed system.
Any time you break the closed system, you make it an open system.
You are correct, Jeep did indeed run a ccv system for a number of years on the 4.0. Sometimes in my hurry, I overlook the year.
There are a number of reasons for excessive blow by (the only real reason for a catch can), however, since you no longer value my input, I will keep them to myself.
Oh, by the way.....
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I'm sorry. I rankles me to be told to go pack sand by someone who can't pass fifth grade english, So I will pack up my thirty years of mechanical experience (including ten as a professional mechanic) and leave you to your silly little Monster can.