Happy 4th everyone, just had a quick question here. I have a 94 z28 which I just finished putting in a new opti and deleting the A.I.R. pump and hoses. I took it all apart last fall and just now got time to put everything back together. My question is, there is a port on the tube between the maf sensor and the air filter box that I just cant remember what went there. Its about the diameter of a dime, like a air or vacuum tube should go there. I think its where one of the AIR hose went, but I just cant remember since it was last fall when I took it off. I know I should have marked it, but didnt. Other than a minor water pump hose leak which i took care of , it fired right up and runs fantastic. Been fighting this car since last summer, should have just replaced the opti and been done with it. I guess you live and learn. thanks for any help.

 

If its the size of a dime, then I would think it to be the IAT sensor.

hth

andy schuck

 

I think you are correct. It should be for the AIR system. That's the only tube to connect between the MAF and air filter.

 

As noted, the hose that supplies filtered air to the AIR pump connects there. Since you removed the AIR pump, you need to put a 5/8" vacuum cap over that nipple.

The IAT is between the MAF and the throttle body, not between the air filter box and the MAF.