rohit13

There should be no more than 2-4 teaspoons. Anymore than that, i would check PCV condition.

Here is a good way to check. Clean the residue out. Drive car for 1-2 months. If the same amount returns then you have a problem. But right now, since you mention you have never checked it before, it could be just build up.

Just Me

Why PCV? What's the path from crankcase to pressureized side of intake track?

Grant

2.7Lturbo

Grant. The intake sucks the Pcv past the compressor and into the pressurized area

4Driver4

Take a look at the spider valve assembly. Rohit is right on. Oil in the intake track usually has nothing to do with the turbos.

4Driver4

FYI, this is posted as a response to your original post.

Just Me

When i'm bored, i'll go look!

Sounds like a more favorable reason...

2.7Lturbo

to all, so i should check the PCV system? what exactly am i looking for? wil it be obvious?

Just Me

to check a clogged PCV valve, take it off, blow through it (or that;'s what one historically did). A spring should be holding it open, absent a bunch of manifold vacuum (which will be zero when its off, right?)

lt's begin with basics. Crankcases will (should) have some positive pressure in them, due to pressure that seeps by the rings (blow by). Manifold pressure is generally negative (vacuum) due to the suck cycle. The degree of suction is related to throttle position.

The PCV valve allows excess pressure and pollutants to flow from the crankcase to the manifold. It has a ball that floats in a race, a seat/seal, and a spring. The spring pushes the ball off the seat making the valve open. A hgih differential (Manifold vacuum - motor vacuum) overcomes the spring and closes it. So it should be CLOSED at idle and OPEN under accel (lower manifold vacuum).

I also understand you can shake them to see if the ball rattles.

Alos, look for a bunch of goop (that's a technical term) at the input side (crankcase facing). That's what would clog it i presume.

note this is mostly theory. I'v never seen one clogged, and two of my cars have little stills instead of PCV valves.

Grant

jcman

Even though I don't own a 2.7t I do have a full factory self study program
pdf, in a way Grant is right about a valve to check being the pressure limiting valve acting like a pcv but vac controlled as I see it.

Here is one page on this subject, good luck!

Just Me

Vacuum controls the valve. A spring keeps it open until vac overcomes the spring/whatever it. This prevents too much vacuum in the CC, but allows ventilation of BB gasses back to the intake.

Actually, its not vacuum per se but *pressure differential* between the two chambers.

The theory can't change although each motor's implementation of course will.

They sure do make something simple sound complicated though. I suppose that justifies a high price :-)

Grant