I'm looking over the intake manifold and noticed that a piece of it is melted. I'm neither its function or what it is.
This is the picture of the piece. It's not my picture; like I wrote, the one on my intake is melted in.
Someone looks like they may have plastic welded it? I'm not sure. Maybe this is related to the knock sensor problem?
Will I need to order a new intake manifold?
Here's another picture.