Blue smoke on extended idle. 2006 4.8is.

JCL · #1 10-08-2013, 09:27 PM

Quote:

Originally Posted by Doru

Could anyone elaborate on this?

Sure. The oil return check valve is in the oil circuit, with no connection to the intake manifold and/or combustion chamber. When the check valve fails, the oil leaks down into the oil sump on shutdown. It doesn't go into the intake tract.

Doru · #2 10-09-2013, 10:41 AM

Quote:

Originally Posted by JCL

Sure. The oil return check valve is in the oil circuit, with no connection to the intake manifold and/or combustion chamber. When the check valve fails, the oil leaks down into the oil sump on shutdown. It doesn't go into the intake tract.

Thx JCL. Makes sense.