Happy to help! Enjoy the ride!!

 

A little late, but I took the intake manifold off my daughter's 2011 2.2L (I'm replacing the engine) and took the following pictures:

The intake manifold side:


The head side:



Steve

 

Thanks Steve! Conclusive evidence, for future readers!

 

Look like you lost the plate too. It is meant tp block the hole in the head. Maybe the Cobalt had a use for the hole?

 

The plate is in the head between #2 and #3 intake ports.

 

The outline of the plate is there but the hole is visible.

 

Yes the hole is visible in the post #1 photos also. That provides vacuum for the MAP sensor.

 

You can see the hole and the outline of the plate. The plate is missing in both pics.
The pic in #4 shows the plate in place.

 

I looked closer at the "plate" area after cleaning the head surface a little.

It turn out there is NO plate. The O-ring on the intake kept the area inside the O-ring clean, while the area outside the O-ring corroded because it was exposed to the air. This gave the look of there being a plate.

It's just the surface of the head with a hole in it.

See the picture below:


This is on the engine that is being replaced, the original 2.2L in the 2011 HHR 1LT.

Steve

 

Maybe earlier heads had the plate then they changed castings for the LE9