The source is likely to be PCV system (I don't know if it's built into valve cover / semi serviceable or fully replaceable for this engine), likely there is an internal o-ring or seal leak, and if oil coming out / air is getting in which can affect performance of the engine. The fuel trims will show additional fuel being added by the ECU if there is unmetered air getting in.

Unlikely to be turbo bearing seals, they leak into exhaust in nearly all circumstances. The oil does not help the intercooler and tends to pool into it and other components, which aides in their eventual failure. You could look into Provent 200 or similar cyclone system to separate out the oil/water from PCV system more effectively.

 

thanks for the quick reply
the PCV system for this engine is built in in the valve cover, that membrane type valve. is it logical for the valve to fail in only 26K miles ?!!

that engine is a MAP only engine, there is no MAF before the throttle, so I don't think that this unmetered air would be reflected in the fuel trim.

so, if oil is getting out, then most probably air is getting out also under boost , creating a boost leak condition, however the ECU is not registering any boost related DTCs, engine performance is perfect also with no loss of power, and no extra hissing sound under boost , confusing isn't it !!

engine oil level also is at the MAX, done about 1.2K miles after the last oil change, didn't use a drop of oil !!

so confusing !!

I will disconnect that pipe, see the condition of the O ring inside, and retighten it again to stop that leak, but what worries me more is the presence of oil there.

 

The MAP sensor is an indirect airflow meter. The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel delivery for perfect combustion. So, with different engine speed loads, it senses the vacuum change in the intake manifold and then converts the change in the internal resistance of the sensor into a voltage signal for the ECU to correct the fuel injection volume.

 

Was that really oil? I have leak at the same place. But its more like water, not oil.

 

It was oil for me. But it has been fixed (fitted normally by the mechanic) and since then it is perfect.

 

Hi guys I have same ıssue with this oiled hose. How did you fix it?

 

Have you already solved it?

 

The issue came back again I will replace the hőse under warranty. At least last year this was told.

 

Hi bro. I changed the pcv valve membrane, then I changed the turbo air hose, but the problem still persists. On Monday, I will change the entire upper rocker cover. Because the entire oil vapor separator system is integrated into the upper rocker cover. I hope the problem is solved. I will write again after a certain km to inform you about the result

 

Thanks. Last year they fit properly the turbo air hose and it was okay almost for a year. Hopefully next week they will change the turbo air hose, I will let you know if that solved the problem for me or not.