What is this and how bad is it that it was unplugged?!

[txhawkguy]

Hey Guys,

First of many posts I'm sure. I heard a whistle under the hood and found this unplugged - some soft of vaccuum hose I assume. What exactly is it and how bad is it that it was unplugged? Photo attached...

2007 Tahoe 5.3 V8

Thanks!

Bill

 

[THE YETI]

It's a vacuum line IIRC. Not bad that it wasn't plugged in, but you should go ahead and plug it back.

 

[InTruckDesign]

That is the fresh air intake for the PCV system, no big deal that it was unplugged.

 

[Sierkonblazer]

Yep, thats a PCV line (positive crankcase ventilation). Its not a huge deal that its unplugged, but it will throw a Check Engine light and maybe cause some driveability issues, poor gas mileage, stuttering, etc. After almost 20 years, GM still hasnt figured out how to make a decent connector for those. The one on our G8 came off on a monthly basis..

 

[txhawkguy]

Good news - I'll make sure to keep my eye on it. Thanks for the info and quick reply's everyone!

Bill

 

[domin8]

The best fix I've found for that came with the GM Accessories CAI. They give you a rubber hose and some clamps to tighten it down with. Before installing the GM CAI on my truck I had problems with that not staying on. I never had a CEL, but it did seem to affect fuel economy a little.