[Jasonkirrane]

Did a smoke test and found smoke leaking from a place that's meant to have a vacumm hose I assume as loads of smoke bellowing out but don't seem to see a hose to put on it. Any ideas conversion to a 325 so wonder was pipe not put in.photo attached of pipe it's at back of engine under where micro filter is behind where intake boot.
Thanks

 

[Superkeith76]

There***8217;s a vacuum cap that goes there. There***8217;s also 2 smaller ports back there. If there***8217;s a valve on the back of the intake next to it then it should hook up to the smaller port if not just cap them off

 

[Ettinger]

You are missing a cap. Secondary air issues are discussed here. If these vacuum lines are original, replace them:
https://forum.e46fanatics.com/showthread.php?t=1246105
https://blog.bavauto.com/12072/bmw-s...to-diy-obd-ii/

 

[Archbid]

Good pictures here https://forum.e46fanatics.com/showthread.php?t=1074573