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    Anyone know what this is?

    I got a set of spark plug wires but it seems like it doesn’t have the same wire that connects to the #6 wire that goes to the distributor. I’m wondering what this is? :/ I’ll post some pics below.

    Btw.. I own a 1989 325i.
    Attached Files
    Last edited by Zephyyyr; 08-31-2018, 07:27 PM.

    #2
    Also what looks to be the wire the connects to the coil is unattached from the wires.
    Attached Files

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      #3
      That's a pulse sensor. Kind of like a low tech cam position center. Early model cars had them.

      And yeah, car won't run without the coil wire.

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        #4
        Originally posted by AndrewBird View Post
        That's a pulse sensor. Kind of like a low tech cam position center. Early model cars had them.

        And yeah, car won't run without the coil wire.
        Thanks for the response. So I have the early model? I thought for some reason that was 1988 and under?

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          #5
          Originally posted by AndrewBird View Post
          That's a pulse sensor. Kind of like a low tech cam position center. Early model cars had them.

          And yeah, car won't run without the coil wire.
          Also I have another question. Is the pulse sensor needed? Because even tho my coil wire is unattached I can still connect it to the distributor just won't be a part of the actual harness. At least I am pretty sure I can do that lol.

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            #6
            It's used by the ECU on the M20b25 to tell it which batch of 3 injectors to fire.
            So it's a 325i/is feature, goes with the front crank position sensor.
            And yeah, kind of... afterthought- looking.
            You don't HAVE to use it- it'll help idle and emissions a bit, is all.

            t
            now, sometimes I just mess with people. It's more entertaining that way. george graves

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              #7
              Originally posted by Zephyyyr View Post
              Thanks for the response. So I have the early model? I thought for some reason that was 1988 and under?
              My mistake, it's not just early models, it's all 325i's. HEre is more info:



              Basically you can run with out it, but it is better to have it.

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