just inspected/passed, now throwing codes at me

[workingonit]

Originally Posted by wpoll

+1 on it being the front diff vent....

Sure looks the part, and I finally located the other end going behind the engine into the transmission tunnel (but didn't see what it connected to).

It's a vent tube alright, but how the heck did it get turned upside down and backwards? without breaking! and where is the "bracket" it attaches to? There seems to be a choice of two, according to Realoem.


I'll find something to attach it to, after I make the opening face down. I'm sure to find more misbegotten malassembled items in my search for the vacuum leak (this isn't it).

And, regarding how to get behind the engine to look for vacuum pieces:

Originally Posted by workingonit

And how does anyone actually reach behind the M54 anyway? do I have to take off the windshield washer tank? The only other way in that I see would be to remove the air dam? where the cabin filter housing is. Looks like the brake hose & other lines run through it.

I think I've found it; there are two bolts holding an undertray below the microfilter area. There are angled guides to help slide it back into place (I think). Added 3/25 here's a couple of videos showing how to do it: https://youtu.be/Qxo5tg1qVRc or https://youtu.be/Eq00ZAOwc88 works on both 3.0i and 4.4 engines. I'll try it Monday, after the wife gets home (I limit my undercar activity, and also disabling vehicles, to times when I can get an unwilling assistant, to lend me a hand).