[Allport]

Chasing a low power / rich running condition I did boost leak test with some odd results.

First I noticed the a leak in the hose from the intake manifold to intake side (pcv). This should never see boost so I checked the pcv nipped and it was there but very dirty. Cleaned it and replaced the leaky hose. It still doesn't seal 100% bit it is much better and hose no longer leaks... However.

They system will not hold 25psi. It instantly drops down. And continues to drop to 10psi. I've checked the entire system and I can not find an external leak anywhere. My valve cover isn't leaking either but there is alot of pressure in the cranks case. Not enough to pop the dipstick but enough I don't like it.

Does anyone else know any problem areas to check for boost and vac leaks? My car will not build past 12psi. And has a hard time holding that as it is. I'm going to cut the hose from pcv and install a brass check valve to completely solve that leak and any future issues but I'd like the car to hold boost alot better.

Side note what is the preset open pressure for the WGA? I feel like it may be set low.

 

[ChevyGuy]

The pressure in the crankcase makes me suggest checking for the orange PCV valve in the manifold. It's job is to allow the engine vacuum in the manifold to pull in the fumes from the crankcase. But under boost, that should close. However, the car tends to swallow it and you're left with a intake manifold to crankcase connection. The pressure can cause the engine to leak oil at various seals.

http://www.cruzetalk.com/forum/34-g...011-2016-cruze-1-4l-pcv-system-explained.html

http://www.cruzetalk.com/forum/34-g...urbo-intake-manifold-pcv-check-valve-fix.html