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What is this wire for?

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    #16
    Wouldn't it be best (if you had it plugged in) to unplug it, and reset the ecu and let it re-learn?
    Originally posted by Matt-B
    hey does anyone know anyone who gets upset and makes electronics?

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      #17
      Amazingly my car runs better now

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        #18
        So with no cat I should have it plugged in?
        -Christian

        '02 ///M3 CarbonSchwartz 6MT daily beast
        08/91 Mtechnic II 325IC alpine/lotus
        318iS, slow build/garage queen...
        '37 Chevy pickup, the über project
        Originally posted by roguetoaster
        Be sure to remind them that the M42 is one of the best engines ever made, but be sure to not mention where it actually falls on that list.

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          #19
          Originally posted by DER E30 View Post
          So with no cat I should have it plugged in?
          Presumably.
          Need a part? PM me.

          Get your Bass on. Luke's r3v Boxes are here: http://www.r3vlimited.com/board/showthread.php?t=198123

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            #20
            Originally posted by DER E30 View Post
            So with no cat I should have it plugged in?
            As long as you have no O2 sensor.

            AFAIK there is no difference in the DME, as both a "euro" and US version have the same P/N.

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              #21
              Hmmm, I'm catless but presumably have an o2 so leave it alone?
              -Christian

              '02 ///M3 CarbonSchwartz 6MT daily beast
              08/91 Mtechnic II 325IC alpine/lotus
              318iS, slow build/garage queen...
              '37 Chevy pickup, the über project
              Originally posted by roguetoaster
              Be sure to remind them that the M42 is one of the best engines ever made, but be sure to not mention where it actually falls on that list.

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                #22
                Yes, since the sensor is pre-catalyst you should leave the wire plugged in if you do have a sensor installed.

                Either look under the car or follow the wire under the battery tray in the engine compartment to the sensor.

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                  #23
                  Originally posted by M3s14 View Post
                  I knew this topic would be about this wire / plug...
                  Everything has been said, I will just add this picture, check bottom left
                  Sorry to thread jack, how do you tell which plug goes to which sensor? Trial and error?

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                    #24
                    Originally posted by chodedub View Post
                    Sorry to thread jack, how do you tell which plug goes to which sensor? Trial and error?
                    Look at the lengths of wire/the bends in the wire, that will generally tell you which one goes to the oil pressure sensor and which two go to the head. Then the coolant plugs will be differentiated by the number of "sockets" for pins on the plug itself, as one has two and the other has one. Further, on my cars the forward coolant plug is grey, the aft is black.

                    Thus, of the two black plugs, the two pin one goes to oil pressure, the one pin goes to the orange/red/brown sensor on the head, and the grey plug goes to the blue two pin sensor forward on the head.

                    Got it? Good.

                    If you are working from a wiring harness out of the car I would say to start with a pin out of the DME and then continuity test the plugs.

                    TLDR (if your car is the same as mine):

                    black two pin connector = oil pressure
                    black one pin connector = rear sensor on head, one pin, redish/browinsh in color
                    grey two pin connector = front sensor on head, two pin, blue sensor

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                      #25
                      Just checked last night, it was not connected. :up:

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                        #26
                        Originally posted by bluevanilla View Post
                        Just checked last night, it was not connected. :up:
                        Who are you? Did you have the same problem or did you log in under another name?

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                          #27
                          Originally posted by roguetoaster View Post
                          Who are you? Did you have the same problem or did you log in under another name?
                          I could have same problem because I have an e30 with m42 engine.

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                            #28
                            Yes, since the sensor is pre-catalyst you should leave the wire plugged in if you do have a sensor installed.
                            No. If you have an O2 sensor you want this wire disconnected.

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                              #29
                              Sorry to thread jack, how do you tell which plug goes to which sensor? Trial and error?
                              One of the coolant temp plugs has 2 contacts, the other has 1 - so that's easy to fugure out. If you plug the oil pressure connector onto the coolant sensor and visa-versa you will get obviously incorrect engine temp readings and the oil pressure warning light will be on.

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