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Identify this part!
I have a p0507 CEL with eratic iddle and a hiss from somewhere in the engine bay, I suspect the problem is a vacuum leak from some where after the air oil separator. If I disconnect the breather hose from the AOS and block it off the intake side, the hiss goes away and idle returns to normal. But then I am left with a puddle of oil under the drivers side. I suspect that the oil and vacuum leak are coming from where the AOS connects to the left head. I believe this is the part that connects the head to the hose leading to the AOS. It has a funny springed vent facing the camera and the whole part was covered with dirty oil. I'd like to know what the function of the spring mechanism is to see if I can just seal off the vent. I'd also like to know the name / part number of this head breather vent thing so I can replace it.
This picture shows the part looking at the engine from behind the drivers seat firewall cover removed (USA left hand drive) and is under the intake manifold.
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