Originally Posted by BryceBrown
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.