I dont know about the canada versions, but on my 04 that is the area where the PCV is. My PCV broke yesterday. their is a vacuum line that goes straight up then curves to go to the intake tube, the PCV (on my 04) points straight back with a vacuum line that runs from the PCV to the backside of the throttle body. If the vacuum line nipple that comes straight up to go to intake tube is broken or the famale threaded portion of the PCV is broken, you will need a new valve cover or what GM calls the composite cam cover