3.8L oil in air inlet hose and below MAF sensor opening

[Earl283]

2003 buick PA ultra, I have found approx. 1 teaspoon if oil in the flexible intake hose between the air filter and the throttle body, also small amount sitting in throttle body directly below the MAF sensor opening. No engine codes are present. There is no breather hose connected to the air intake hose so what is the oils most likely source? this is my first experience with a supercharged engine could that be a factor?

 

[Drakito]

The air inlet for the PCV system is in the throttle body(TB), behind the MAF and in front of the throttle plate, on the bottom of the TB. If you descreen the TB you can see the air intake at the bottom. It is cast into the aluminum.
It lets metered air flow through the supercharger case into the front bank head near the pulleys. The air flows down and into the crank case and back up through the rear bank head near the transmission. It goes into the supercharger case below the black plate marked PCV, through the PCV and into the suction side of the supercharger, behind the TB, but before the supercharger rotors. This puts suction on the PCV system, but stills allows the air to be metered by the MAF so you have a good idle.
The PCV valve is most likely clogged, or the "O" ring has deteriorated. Either way it is a sub $10 parts and about 5-10 minutes to swap.

How to:
http://www.paulstravelpictures.com/GM-3800-II-PCV-Valve-Replacement-Guide/index.html

 

[Earl283]

Thank You Drakito you confirmed my suspicion and your description was great. Thanks Again !

 

[pila80]

Very well explained !!😉