Many of you are aware that sometimes the diaphragm in our intake manifold decides to just up and leave willy-nilly whenever it feels like. So, today, I'm going to try to remedy this issue without buying a new intake manifold. I took my car to the dealer and they said, "there's no check engine light, so, there's nothing wrong". I'll be posting my results and a potential write up it all goes well. If not, I'll report back and say that my tests didn't go well. I will also be installing a catch can at the same time, however, this step may be omitted.
The line that runs from the intake manifold to the turbo isn't covered in corrugated plastic, it IS
corrugated plastic, however, I've got a ******* solution for this and I'm sure someone will find a better one. That line on my car had gotten cracked somehow. I don't know if it was the kid that the dealership had working on my car or if it's just worn out. I'm waiting on oil-rated line to come in the mail. I know random vinyl tubing probably won't stand up to the oil forever, but, it's what was available at the time of this post. I also know that someone may have a better design or know a place to buy an in-line diaphragm. I don't, however, I do know that there is a Lowe's down the street, so, let's get started.
The generic parts list that I'm looking for at Lowe's today is this: barbed 3/8" fittings (size could change from build to build), some kind of a casing to go around the other end of these fittings to attach them so that they're positioned as "male to male", and a metal ball to go inside of here. I don't know how well this will work, but, it should be better than nothing.
On my Cruze, like I stated earlier, that PCV line had gotten damaged. So, I've got a splice of (I think transmission cooler line) going to it. I used a hacksaw and I cut off a large chunk of the line. I have a 5/8" piece of vinyl tubing on the outside of each end some fittings to take it down to 3/8" or a little bigger and hose clamps to be safe. This isn't really pretty, but, I'd rather have hose clamps than hoses that fly off. Especially since I'm tuned for ~20 psi of boost, seemingly.
The diaphragm allows air to circulate under at least vacuum and maybe even low boost between the intake manifold and the front of the turbo. Under high boost, the manifold gets sealed. That's what I'm attempting to do here. I gathered some information from this post on Sonic Owner's Forum 1.4T PCV Explained - Chevy Sonic Owners Forum
. If that post is accurate (and I think it is) and the Cruze and Sonic have the same 1.4, which, I'm certain they do, then this information should apply to the Cruze. It's a good write up about our PCV system. It has a good engine dissection and nice dry-erase diagrams.
Sorry for the long post, however, I feel like this is an important step. I should note that I am currently an engineering technology student so this build isn't completely ******* engineered.