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o2 sensor wiring help

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  • o2 sensor wiring help

    well i installed the RMF header and the o2 sensor location is obviously not in the same spot, so what i did was get 16 guage wire, cut it, used butt connector and just added what i needed to reach the new location. but the problem is now the car runs like shit stumbles, mis firing and just sucks to drive once fully warmed up..is there a proper way anyone has done this. i've been doing research for the last hour and can't seem to get a straight answer! help me out guys

    also forgot to put its just a stock 91 LS motor with a header and cold air intake

  • #2
    help ASAP, this is my daily and i cant stand driving it like this..

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    • #3
      Did you extend the sensor-side or the harness side? And naturally, you didn't cross or mix up any wires?

      As long as nothing was mixed up I can't see there being a problem with simply "extending" wires.

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      • #4
        i extended sensor side, and after some more research it could be the type or wire i used, im not sure if i used copper or aluminum. and i think my route might not be helping it any either

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        • #5
          Oh, well the type of wire will definitely have an effect on it..

          Was the wire you used comprised of a bunch of fine wires braided together, or was it fewer, thicker wires (compared to the stock wiring)?

          If there isn't enough surface area (lots of thin small wires) the current won't travel like its supposed to.. and on an O2 I could see that causing problems.

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          • #6
            thats the problem i can't remember, ima run outside and pull off the connector and look..be rite back lol

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            • #7
              ok, so the original wire that goes to the plug and also on the end of the o2 sensor is a much finer wire than what i used..i took a pic..think this might be my issue??

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              • #8
                Very well could be.... I'm not good with wiring or electricity lol.. I'm but I do know that vehicles use fine-wiring because of how the current travels on the surface of the wire versus THROUGH the wire like in houses (ac vs dc current)

                If you had some spare wire from a car harness, I'd try that.

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                • #9
                  i dont have spare anything, i live in an apartment so anything i take off my car goes rite in the dumpster...what i think i should do is get a new o2 sensor just plug it in and extend it on the harness side, since apparently the wire used from the plug to the sensor is like nickle or aluminum or some shit and then once it plugs to the harness it just normal copper..

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                  • #10
                    Originally posted by bryan24207 View Post
                    ok, so the original wire that goes to the plug and also on the end of the o2 sensor is a much finer wire than what i used..i took a pic..think this might be my issue??
                    That should not matter. But the way you make the connections could have some effect on the O2 sensor signal that the ecu sees. You need a good ground, good connection on all conductors, like a good quality crimp connector etc.

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                    • #11
                      Or good (electronic) solder connections...

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                      • #12
                        u can't solder an o2 wire..and yea it should matter cuz i am using a thicker copper strand wire compared to the fine aluminum wires in the original wire, so the flow of current will be changed. i have good crimp connectors on it and its clearly not working

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                        • #13
                          Originally posted by bryan24207 View Post
                          ...the wire used from the plug to the sensor is like nickle or aluminum or some shit and then once it plugs to the harness it just normal copper..
                          probably just stranded copper, coated with another metal.

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                          • #14
                            tomorrow i am just gonna go buy a new o2 sensor since the leads on the new ones are much longer than the oem one, maybe it will just reach but if it won't i feel safer trying to extend it on the harness side this time since it didn't work too good for me on the sensor side

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                            • #15
                              Btw, some people recommend using shielded wire when you start modifying O2 sensor wiring, like here:
                              http://stores.homestead.com/hydrogen...sor/Detail.bok

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