thanks... I thought the fact that I said it was a vent line explained its function...I think you're misinterpreting Dave. He never said it didn't DO anything. He said it doesn't go to anything, which is true in stock form. hose comes out and most had a little vented end on them right there, which is why I suggest you just dump that and make it go somewhere.....up inside the engine compartment nice and high up for venting.
codes may help, but I'd bet it's just another crap issue due to electrical engagement. So unreliable it's not funny.ok thanks for the responses so if that vent line is plugged would it make my 4x4 not work because i have the push button 4x4 and no lights come on or anything when i try an put it in 4x4 should i take the plug off the vent line and see if it works?
Wow guys...some really odd suggestions in this thread.
The 4x4 system doesn't have anything to do with the engine computer, so there will be no codes related to the 4x4 system. Actually there may be one, "4x4 switch closed" but I have no idea how the computer knows or cares about that.
Even the vehicle speed sensor for LOW operation is seperate and a failure of the transfer case computer VSS will not throw a code.
Here is the appropriate diagnostic.
Follow each step slowly, step by step. It's not hard but it does require a basic understanding of block diagrams/schematics. I've diagnosed my electric 4x4 system failures twice with it, and each time it took about 2 hours and the fix was almost free.
It's pretty simple if you get to know how it thinks.