Hi, this is my first post, hopefully I'm not asking this for the thousandeth time, I couldn't find it by searching. I installed a cold air intake on my 88 XJ and I have a question in regards to one of the lines that was in the old box. The intake has two nipples to plug in the intake lines from before, but there is a third, smaller line that was plugged in to the stock box. I think it's the vacuum line, but I'm not sure. If I fire it up and put my finger over the tube, it's definitely sucking. Has anyone else had this problem when installing an aftermarket intake? Should I tee off of one of the lines from the new intake, or am I totally missing something here?

 

Cap it. It is the vacuum line that operates the flap on the stock airbox for warm air at start up. Ya don't need it. Oh ya.... welcome.

 

Great, thank you!