its connects to the intake. its a valve cover breather line. u can remove it from the intake and put a cap on that part of the intake. u can also remove the line completely and put a breather filer on there. https://secure.buschurracing.com/cat...KNbreather.jpg

 

doesnt that line connect to the BOV

 

No, it does exactly what cthcky5 said

 

No.9

 

i no you can put a breathe on there but can it connect to the top nipple on the BOV or am i thinking of a different lin

 

ur thinking of a different line. in the diagram #15 is the vaccum line to connects to the bov or dv

 

ooo yeah thats the one my bad

 

+1

also, what are the pros/cons of capping the intake nipple and putting a breather filter on the valve cover breather?

 

During non boost operations metered air goes inside that line to under the valve cover and inside the intake manifold from the rear passenger side of the valve cover. When you boost the rear passenger side has a check valve that closes to prevent pressure from reaching the valve cover, so the crank case pressure escapes from that line (driver side) and goes into the intake pipe.

Now remember that the air has been metered by the MAF during normal non boost operations. If you put a breather then you will be sucking in unmetered air (air from atmosphere) into the valve cover and ultimately into your intake manifold. Your car will not run smooth and might cause a few more other issues.

If you want to run a breather you would have to cap the intake manifold, remove the check valve from the rear passenger side of the valve cover and run a breather there as well.

I've done a lot of research because I thought that vacuum is needed under the valve cover to remove blowby and replace it with fresh air because there were claims that it would accelerate contamination of the motor oil. But that will not make a measurable factor since there are many other ways the oil gets contaminated. The closed lines are all just for emissions purposes. Catch cans dont work 100%, even the baffled and ones. Best solution is vent to atmosphere but thats as illegal as running test pipes.

Muscle cars would run a hose to the exhaust pipe and use the venturi effect to draw out blowby. But they did that so oil wont drip down. If you run a breathers it would be best to run a hose from the valve cover to a catch can that vents to atmosphere. This way you wont have oil vapors accumilating and eventully leak slightly from the valve cover breather.

 

Whatever you do don't cap that port like someone said could be done in an earlier post. That will lead to increased crankcase pressure and possibly oil all over your engine bay from dipstick pop out.