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Originally Posted by BNaylor
Why was the plenum replaced assuming you are referring to the Upper Intake Manifold Plenum? Normally you can replace the plastic retainer that fits over the PCV valve and that holds the MAP sensor separately without replacing the plenum.
Hard to tell by your post but were the lower intake manifold gaskets ever replaced?
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Sorry I wasn't clear with my post.
Yes the Upper Intake Manifold Plenum was replaced because of broken piece that holds PCV valve and MAP sensor. I did not see a picture of what was broken, either the housing where the PCV valve sets in or the plastic retainer that fits over the PCV valve and holds the MAP sensor. Like I stated in update post, I believe they damaged some injectors when removing fuel rail and injectors to remove plenum.
Yes the Lower intake manifold gasket was replaced when she bought the car about year and a half ago because of coolant leak. She has driven the car since this gasket was replaced without any problem with oil pressure until this work was done.
I believe that damaged injectors allowed excessive gas to wash clyinder walls and mix with the oil causing it to thin out and break down thus greatly reducing the oils abiltity to reduce the metal to metal friction that is its purpose.
My question is: How can a person determine if the bearings failed because of gas in the oil or coolant in the oil??
Thanks for advice.