Well I just purchased my 87 n/a and I was looking over the engine, there are a lot of plugs that lead to nothing but i think its because the car was orginally a T2 but for some reason the owner switched it to N/a. Well I was looking over the car and I noticed that the plug that goes into the stock headers which I am assuming is the O2 sensor is plugged into the header but the other end is just hanging and is not plugged in. There is about 1-2 feet of wire between the two ends and I cannot find where it plugs into. I have searched the haynes manual and original 7 manual but cant find where it goes, if anyone knows which I am sure you do please let me know. Also my 5/6th actuators are stuck closed I think they will not open when revving it, also they will not open by hand even when i press hard. There is a nipple at the bottom of them and by the diagrams I have seen there is supposed to be a air line there but I dont know where it connects to. Please help me to get this baby running well. Thanks and sorry for the long post.

 

bump comon guys i just need to know where thisO2 sensor connects to I cant find the plug for it anywhere.

 

You will find the O2 sensor wire (single connector) somewhere on top of the engine, behind the throttle body. There is a lot of stuff there, so you will have to hunt around for it.
The 5/6 ports are stuck, you may get some joy by removing the actuators (2 10mm bolts I think). Lubricate and work them some. It will be obvious which part is seized! If the port sleeve itself is stuck, I cant really say how to release them, but don't reef on them too hard or you will bend something...only a small fork on say a 1/8" shaft that connects them.
The nipple 'air' supply is actually an exhaust backpressure. There is a tap on the cat that goes to a check valve not far from your O2 sensor (see page 4A-2 in the Factory manual). A short rubber hose connects those two.
Dave

 

awesome info thanks a ton