Can you identify this port?

[Toran]

Hello again All,

Can someone please help me identify the port inside the blue circles?
Should there be a hose connected, and if so where to?

T.I.A.

 

[Toran]

Identified!

1st image: Vacuum line goes to secondary air injection on 2003-4s. Probably goes to the black cylinder thingy that captures the vacuum. If you don't have SAI, I think it should be plugged closed - probably would make the engine run rougher and throw CEL codes when open. It is a nice way of testing the engine vacuum though.

2nd image: Throttle body heater plate coolant lines. Left one goes to a hole about 14 inches to the left at the top of the engine. Right one goes to the coolant expansion tank.

 

[joey]

Sorry I didn't reply in time, but glad you found the issue, I have been working 14 hour days and haven't gotten online in the last few.

 

[Toran]

Not to worry joey.
Glad to hear you have the health to still work a 14 shift!
I thought it was good to post the result for future noobs, or just in case I forget again!