Went to my first car show with the SS today, and got a check engine light on the way there. P2178. Scanned and it said "fuel trim system rich at cruise or accel - 1st bay". Now the car doesn't start right away, and turbo isn't boosting.

Gonna have to do some research and see how to fix

 

Not a lot here on that code. Boost leak, dirty air filter, MAF sensor.

 

Here's a link to a homemade boost leak tester. 2.0 LNF Engine Boost leak test a stock SS LNF. - Cobalt SS Network

 

Thanks RJ - My guess would be boost leak since the turbo never felt too responsive since we finished the LDK.

The MAF sensor wasn't covered in oil, so it should be ok (doesn't hurt to check). The air filter and cold air intake is all new from ZZP, so it shouldn't be dirty.

My guess would be a boost leak somehow. When we first road tested, sometimes I wold have 5psi, other times 11psi. Maybe it's all coming out of the clean side Seperator I put in place of the oil cap to get rid of the engine whine.

 

That's in place of the oil filler cap? And hooked up to your CAI, before the turbo? So there shouldn't be any boost there, right?

Of course, the charge air piping and intercooler are the obvious suspects. But what about a check valve? While boosting, the intake manifold gets charged. If the check valve between manifold and catch can were bad, it would pressurize your catch can, leak boost back into the mouth of the turbo(is that considered a leak?), and into port #2(definitely a leak), pressurizing your crankcase(bad).

 

Oh! Maybe because I have my intake manifold and port 2 teed together to go into the can, It's going into port 2.


Could be coming out of the manifold PCV and the air is going to both the can and port 2. I should probably install a check valve on the port 2 line as well to make sure air flow only goes away from port 2. That way when the PCV from the manifold is allowing air to the can, the check valve on port 2 line will stop it from continuing into port 2 and force it all into the catch can (which is what I want)

 

You've got the TTR manifold... is your red port- base of manifold - a vacuum source or vapor pick from the crankcase? Same question for your black port-body of manifold?

 

The TTR manifold is PCV delete, so the taping allows me to have someting like the stock PCV functionality for the manifold, so my guess would be to remove crankcase vapors. The black port is just feeding red line back into the manifold.

Instead of it being all internal like the stock intake manifold, it's now external with a catch can intercepting any blow by before it goes back into the manifold.

 

OK, that's what I expected. The only way your catch can system could be the cause of a boost leak is if that check valve has failed. The one between manifold vacuum and catch can.

Putting a check valve where you are proposing wouldn't hurt anything, but it really wouldn't be of any benefit either. Port #2 and your PCV port are both pressurized to flow out of the crankcase, one is not going to flow into the other.

You could pull the hose off the check valve, on the manifold side, and blow into it, if any air gets past the valve, it's bad. If it's good, you'll have to check your charge piping and intercooler.

Is your air filter oiled or the dry type?

 

Good to know! So if I blow into the check valves, I shouldn't feel air coming out the other end? Same thing with the PCV on the manifold side?

Also - I don't have the clean side seperater connected to anything. I didn't want to connect it to the air intake because then nothing would be connected to port 1. I guess I could tee all of that together?


I have the ZZP intercooler package, so it's the aluminum powder coated charge pipes, and the intercooler is solid metal.

Air Filter that came with the ZZP high flow air intake is a K&N - so I would say oiled. LNF HHR High Flow Intake - Air Intake