ASE doc

Just to put this info out there, the O2 sensor circuit from the ECM should read about 450 milivolts with the sensor unplugged. That's the mean circuit voltage from the ECM. Zero volts from the ECM would mean that the diagnostic circuit for the O2, or the circuit(purple wire) is open, or that the connection at the ECM is open.

fervernt

alright cool good to know. And I do have a remanned jasper?? what compression test are you talking about?
My car's in the shop again, having the fuel system checked out because I still don't like how its running. once I get it back though? I'll be looking for that o2 wire again.

TwinTurboROC

This is what i was talking about. And it was in response to someone who posted, then deleted their post. So that's why my comment looks so weird.

fervernt

oh alright. I guess I never saw that post you were responding to. that's why I was confused. So here's another question. Does anyone have a pic of the wire to the o2 sensor? and the plug that goes to it? I've still got my fingers crossed that it's just hangin out somewhere on the driver's side and I'm just missing it. Also, I noticed something strange, if I understand how it works. The sensor that goes into the head on the pass side is the fan switch, yes? There's nothing plugged into that switch, yet my fans come on and off like they should? how is that possible. I thought they needed coolant temp to know when to turn on and off. The sending unit for the temp gauge is gone, the fan switch has no wire to it. Where else could the fans be getting a temp from? I'll track it down sooner or later, but if anyone has an idea, I'd appreciate it.

TwinTurboROC

the fans are controlled by the pcm, at specific temperatures. the secondary also can come on if the ac is on. And then there is the saftey switch at the back of the passenger side head. single wire. The PCM coolant temp sensor is usually found right infront of the intake manifold where it meets the block. The GAUGE sensor is in the drivers side head between plugs 1 and 3. single wire also. V8tpi 's. Im working on one of my cars today, ill take a pic of where the o2 sensor is and post it up in about a hour or so.

fervernt

ok so it must just be the safety switch that isn't plugged in. Any idea on what color that wire is?

TwinTurboROC

Here you go, Thats where the o2 is.

Edit :sorry it took so long, was re-doing my speedo cable today. Now i remember why i hate stock f bodies.

fervernt

alright so here's a quick update and a couple more questions. Finally got my car back from the shop having the fuel pump done. Twice. 1st one whined like crazy, so I took it back for warranty. 2nd one is the same. It's driving me nuts. but I think it's something else going on. It was whining til I filled it up again, and then stopped like a switch. Always happens on hot days, so unfortunately I think I've got that problem so many of us have with the fuel overheating. any new thoughts or solutions that people have found would be great, but if not, I'll just be trying everything already suggested. the fuel lines were rerouted already far away from the headers, and were cool to the touch. headers are heat-wrapped, and tank still has heat shield. next thing I'm gonna try is taking the car into a dealer for that recall. I qualify and do have a crack in the filler neck so a new tank will be nice, and may solve the problem.
and, on a separate topic, is the o2 sensor wire located in the same loom as the wire that controls the temp gauge? I found a purple wire and a green wire in one loom, one for temp, other is unplugged. If that's my o2 wire, I'll be VERY happy. Been looking for awhile now for how to get rid of that pesky code 13.

fervernt

Another update. I got approved by the dealership to get my tank recall taken care of. They found a new tank for me, and will be putting it in next thurs. I'm very excited about that. I'll also be warrantying that fuel pump again. Gonna ask for a better quality pump this time too, just to make sure I don't have this problem again. That's the big news. Next projects I've got are getting my map sensor working properly, and getting that o2 sensor in.
map has been acting all kinds of weird, I'm fairly convinced it's a bad signal wire. could also be the ecm though, so hopefully it's not that.
o2 sensor should be straightforward, I'm just trying to decide whether to extend the wire to the driver side where the prev owner for some reason put the sensor and plugged the wrong wire into, or to just put in a new bung on the driver side and run it at least close to where it should be.