Too much pressure?

[Sommerfeldt]

Are you saying there's oil coming out of your filler cap? In that case, you've got so much crank case pressure, it's a wonder your RMS and cam seals aren't leaving, while scalding you for not doing your PCV...

If you CEL is intermittent, the MAF is also a good candidate - how's the car running, besides the blowing oil thing...

- S

[Sommerfeldt]

First thing to do is the glove test. That'll tell you all you need about flow in the PCV system. The gasket on the filler cap is a known failure point. Over time, they naturally become hard, and leak. But, MAKE SURE that you do the glove test and verify your PCV. Did you clean out the block ports and the PTC?

Are the vacuum lines for the TCV routed correctly and/or whole and in good condition? How's your fuel pressure regulator?

- S

[Sommerfeldt]

There should be smooth, negative pressure, which increases with light RPM increase.
In your situation, you probably need to check a few things off the list.

1. Make sure that your PCV hoses are routed correctly. I seem to remember there floating some backwards instructions around - don't remember if it was FCP's, however. Make sure that the manifold gasket is whole, not pinched anywhere, while you're at it.

2: Check your TCV hoses. The TCV is the Turbo Control Valve. It has 3 hoses - one to WG actuator, one to turbo beside intake snorkel, and one to fresh air hose. Check all, make sure they're routed correctly. If you haven't touched those hoses, replace them, since they're getting old anyway. Do one at a time, to make sure routing remains correct.

3. Check that the small PCV hose from the right hand side of the intake manifold (i.e. the left side when you're looking at it from the front of the car) is intact with elbow. If you want to be extra sure, replace it with a rubber/fuel hose @ ~5 mm and route outside the manifold to the PTC.

How's your FPR? In any case, your code often points towards a dead or dying MAF, nothing to do w/ WG. The CV pressure you're describing is at idle, I'm assuming? So it's a little worrying, especially with a new PCV system.

- S

[Sommerfeldt]

There's a diaphragm in there, which if broken can leak fuel into the vacuum line. That will understandably cause a lot of weirdness.

As for the glove test, a healthy PCV system will make sure the glove is sucked down. It varies a little from car to car, but revving it up to 1500 or so should cause even more negative pressure, visible on the glove. The pulsation isn't right at all.

- S