1: I've read on mig that the breather mod is not required on Ecotec engines. Why? I've not see underneath an Ecotec cam cover, but is there not a plate that needs cutting to cut down on oil seeping into the breathers like on the XE?
2: Has anyone fitted filters on the breather pipes that go from the cam-cover to the intake pipe and the other (small) pipe that goes to the TB below the butterfly? If so, do they clog easily? I've already done the VX mod on the crankcase breather (and that gets fulla' ***** really quickly!). Also does anyone know what job that little pipe (below butterfly) actually does. Is it important?
3: Some peeps have vented these pipes off to atmosphere. Does it really make a difference? Will it / has it caused any problems? For MOT, you'd need to return it to normal right? What's the best way of rigging up a catch tank if you do do this (where can you buy 'em?).
4: Is it worth doing any of this, or just regualrly strip out the ICV and clean it like I've been doing? Problem is the well-known shite idle of this type of engine. My thinking is "stop oil getting back into the ICV in the first place, should stop the problem of it getting sticky". I know others have thought this...
I must admit I'm going to try venting mine to a catch tank and then from there back to manifold/ throttle body to filter out the gunge.
I've just ordered 2 more breather pipes to enable this - I had the same thoughts as you although mine is an XE.
I was hoping it might help with the stiicking revs problem (as opposed to irregular idle) I get in warm weather after giving car some stick but the general concensus of opinion is that it won't help with that.
Keep me posted how you get on and I shall do the same if you like - shall be trying it out next week.