Routed vaccum bov vaccum line to intake manifold a few weeks back and burped all sorts of oil into my catch can after a few hard pulls. Restored solenoid control, cleaned out catch can, hard pipes and intercooler (lots of oil was burped, filled catch can) and all is well once again! My catch can had a few drops of blowby after a few months prior to doing this!

I have no clue as to what the mechanism is? The solenoid opens bpv more than intake manifold vaccum...somehow the crankcase got boosted?

 

idk bro, Ive had mine run directly to manifold vacuum for nearly 2 years now, both with the stock BPV and and now the treadstone BOV. my catch can has always been relatively clean.

 

why would you bother routing a different vacuum line to the BPV instead of the one proven to work?

 

^^ This

You have no reason to be messing with the vacuum lines unless you're running an aftermarket BOV...

 

the lnf has a vacuum assist tank or something like that and sometimes the vacuum tank or solenoid or whatever it is fails and you get flutter cause the vacuum isn't happening as it should. if you get the bpv's vacuum straight from the manifold you will notice how quickly you come in to boost and how fast you go into vacuum compared to the way it is set up stock.

 

believe op is referring to this

https://www.cobaltss.net/forums/2-0l...st-mod-191361/

 

Bpv was flutterdumping. Initially assumed that the solenoid was malfunctioning so routed bpv to intake manifold. After the oil mess reset back to stock and bought a forge bov. Probelm persisted. Replaced my blown map sensor and ecu threw code p2261 for bpv performance-mechanical. Found Gm tech bulletin which stated vaccum tank was the culprit. Visually examined vaccum tank and all was well so I assumed the check valve had gone bad....bought a vaccum advance check valve vfrom Napa and placed on line from intake manifold to solenoid, now all is well!

 

You didn't blow the MAP, it was covered in oil.

 

Hmmm im throwing a p2261 but im on a aftermarket turbo and I have my line that goes to the intake plugged still have the vaccum tank installed