Vacuum line?

[Philly]

wouldn't leaving that exposed, draw unfiltered air into the engine?

[cooljess76]

Yeah, i've found a few errors in the Bentley, so I use the Haynes to verify information. Also, neither is 318ti specific, but both have a little information about ti's, so between the two you can usually find what you're looking for. Sometimes the Bentley explains things better, sometimes the Haynes does. Pelicanparts has an alright technical section too, but I think this forums knowledge base is the best source of information on the internet. Plus you have a dozen or so of us that on here regularly and eager to help with first hand knowledge

[cooljess76]

Originally Posted by Philly

wouldn't leaving that exposed, draw unfiltered air into the engine?

Yep, but more so it allows air and oil to blow out.

[NeoMishMoo]

Well I have a hose on it right now, but nothing on the end of the hose. Guess I'll buy the CCV, but I'll find a hose to hookup to it because no way am I paying 30 for a double hose when I only need one of the hoses. PO swears that I don't need the valve but it definitely can't hurt to have it on there.

[cooljess76]

Originally Posted by NeoMishMoo

Well I have a hose on it right now, but nothing on the end of the hose. Guess I'll buy the CCV, but I'll find a hose to hookup to it because no way am I paying 30 for a double hose when I only need one of the hoses. PO swears that I don't need the valve but it definitely can't hurt to have it on there.

The CCV is absolutely necessary. Bad CCV's are know to cause all sorts of idle problems. Search the forum and you'll see dozens of cases where the CCV was culprit to high idles, low idles, rough idles. Typically when they go bad they hiss. These engines are so sensitive to leaks, any unmetered air entering the engine after the MAF will cause it to run rough and possibly misfire. Removing the dipstick or oil cap while it's running will give you misfires and a really rough idle.

[NeoMishMoo]

man i'm used to the m20, thats one of the least sensitive engines ever. thing is a tank. john boy constantly blows ccv's under boost pressure. guess i gotta figure something out.

[Romak]

Originally Posted by NeoMishMoo

But its pretty hard to polish a turd

Actually mythbusters proved it to be quite easy!
http://www.youtube.com/watch?v=yiJ9f...eature=related

But back to your idle issues, even leaving the oil cap cracked or dipstick out (ask me how i know) can cause bad idle so an open hose would definitely throw it off.