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What is this piece on the Intake Manifold found in Vortec 5.3/6.0 Engines


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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.

image.thumb.png.ce406b7057ca217bc0eadd991aafa7ee.png

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?

image.thumb.png.0be04c09cab0533d12461747a87e7064.png

 

Here's another picture.

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If the tab on that connector breaks off and the port opens you will get a lean fuel code and need yo put a cap on it. My 2010 tab got knocked off by my mechanic while changing the plugs and we put a cap on the port.

 

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