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Originally Posted by 0341TODD
No shit- thats exactly how I feel- here is what Im asking though balliztic- why isnt mine reading with a new 02 sensor? should I hook it up to the car side of the plug- I have it soldered to the white wire from the oxygen sensor and it kinda reads lean at idle- I know thats not right and i know the the gauge works damnit b/c I just had it hooked up in my nx so I could tune my afc when I was running nitrous- remember about my fuel pressure problem? Do you think that I could have that little amount of pressure that the car just would run totally lean like that? I mean- when Im driving the thing doesnt even read at all!
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When you pull the wire cover off the O2 sensor plugin , there should be 3 wires in there. The really thick gray wire is the O2 lead to the ECU itself. The other 2 are the heater wires. The thick gray wire has the outer covering , a layer of coiled suppression wire(This wire is "hardened" against external signal sources , it's easy to interfere with the 1 volt the O2 sensor puts out) another inner covering and then the O2 wire itself. To clear up any confusion , I pulled the covering off that part of the O2 wire that runs up by the throttle body inlet bend on its way over to the passenger side of the firewall.
From what I know about the Z31s ECU , it completely shuts off the fuel injectors when you are decelerating in gear , so you won't get a reading there at all. All other times , you should see at least the last LED light up at idle. Cruise (part throttle) , the LEDs should light up in a sweep back and forth from rich to lean , but I've noticed it doesn't sweep the entire dial , just about from the first 4 to the last 4. If yours isn't sweeping at ALL , you probably just missed a connection somewhere. A/F guages in particular are very sensitive to the connection , since there is generally less than 1 volt involved .