This is always the case. Im looking through my engine bay and noticed that my o2 sensor was not hooked up. I have no idea where it goes. So im on the phone with FlyingMonkey who is swaping engines at the moment on his 7. He tells me where to look on the wire harness. Its there I hook it up everything fine. Gets better. I noticed that the plug on the back of the coolant filler tube is unpluged. I dont see a plug anywhere. So hey I think Ill take off the intercooler to see if its back there. SNAP compsite plastic. I break the celleniod for the BAC. **** never fails. Monkey has his blocked off. This is becoming a opption for me as well. any draw backs? Also any Idea where that connector hooks up to?


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Replace the BAC valve. Good luck getting your engine to idle under load without it.

The connector for the O2 sensor is at the back of the engine, passenger side. It comes out from under the lower intake and will normally have a green plug on it.

 

yea, best bet, Replace the BAC valve.