So while back I tried to do a quick boost leak check and was in a rush and forgot to put the hose back on the check valve. Of course all the air came out as it was going in.

Today I had sometime and went to the store to get some pvc and pressurized the system. I pressurized it at the intake tube that connects to the maf and took off the pankcake valve and plugged it. Put 10 psi in the system but soon as any air was put into it, there are bubbling sounds from what sounds like near the oil pan. I took the oil cap off, and couldn't feel/hear anything and same for the coolant reservoir. Any suggestions? Searched but no luck and looked at some vacuum diagrams with still no luck of being able to tell what would cause this. Thanks for help!

 

Happend to me also, I heard other people experienced it. Don't know...interested to find out too.

 

Only thing i can think of is the oil return line is getting air in it.

 

could be seaping past the rings or the valve seals

 

could be a clog and oil is recirculating