Does anyone know what the little black hose is that connects in between plugs 2 & 3 on the S70 engine block? Mine seems to be leaking oil out onto the flat surface surrounding the plugs (under the Volvo plug cover). I thought it was the gasket on the oil cap, but it cannot be.

I need to get to the bottom of it but cannot find an "engine" book on this car. Any suggestions?

Thanks.

 

First clean it really good and make sure it is leaking from there.

Alot of times when people do oil changes they spill oil in there and it just sits there.

If it is leaking from there the hose goes to the vent box under the intake manifold.

 

Oil has been cleaned off several times. Keeps puddling even after having been cleaned.

I am guessing the culprit is the hose that plugs into the top by the # 2/3 spark plugs.

Any more ideas?

D

 

You don't have a picture of the vent box by chance do you?

 

No sorry no picture.
It is under the intake mainfold behind the A/C compressor.
Either the Vent box is clogged or one of the small hoses are clogged.