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87 325is to 24valve wiring help

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    87 325is to 24valve wiring help

    So the new motor is in and I started wiring it in but I've run into a few problems. The 87 was missing a few wires in the c101 that were moved to the either the c103 or c104. I'm having a hard time figuring it out because none of the wiring posted on the forum shows this. And when it is talked about it seems like ppl are calling the c104 the c103 plug.

    Any help would be great. I wanna get my car back on the road asap :)
    1987 325is - sold
    2001 330i - New DD

    #2
    The connections you need to make are all located on C104, a three pin connector.

    Pin 1 BK/BU Engine Speed Output
    Pin 2 GN OBC Code Relay to E30 main relay terminal 86
    Pin 3 WT Present Fuel Rate Output

    You need to hook up C104 Pin 1 and Pin 3 to the E36 wiring harness in order to get a tach signal and to get the economy gauge working.

    Originally posted by whysimon
    WTF is hello Kitty (I'm 28 with no kids and I don't have cable)

    Comment


      #3
      I did the black wire (pin 1) on the c104 to pin 20 on the e36. My c101 doesn't have anything in the pin 8, 14, or 15. Do you know where those wires would be on the e30 side?

      What wire does the pin 3 on the c103 wire into the e36 harness?

      thank you for responding fast
      1987 325is - sold
      2001 330i - New DD

      Comment


        #4
        C104 pin 3 goes to x20 pin 24

        C101 pin 15 is responsible for triggering the unloader relays during start in late models only. Early models used C101 pin 18 to both trigger the unloader relay and the starter.

        C101 pin 14 is empty on the 87s. It is the road speed signal, which must be passed to the E36 DME to maximize performance. You can tap this signal from the cluster at C3 pin 26, a BR/RD wire. This would go to x20 pin 14.
        Last edited by FredK; 02-15-2009, 05:27 PM. Reason: oops, i meant c104 pin 3

        Originally posted by whysimon
        WTF is hello Kitty (I'm 28 with no kids and I don't have cable)

        Comment


          #5
          awesome. So from the info I've found pin14 on the e30 side is for the speedometer signal. There is no wire in my c101 for that. Do I need to track down that wire also or is that another dual thing like the pin 15 late model and pin 18 early dual?
          1987 325is - sold
          2001 330i - New DD

          Comment


            #6
            ok so I'm having a starting problem now. I'm not getting fuel. I haven't wired in the two wires on the c104 yet but it doesn't seem like that should be needed for the car to start.

            just noticed that I keep blowing fuse 21. That fuse controls fuel delivery. It blows as soon as you put a new one in, even w/ the car off and the keys out of the ign. I unplugged the engine from the fuse box to see if it maybe had something to do w/ my wiring but it still blows the fuse.
            Last edited by Apex381; 02-23-2009, 09:10 AM.
            1987 325is - sold
            2001 330i - New DD

            Comment


              #7
              The glovebox wiring, is it just dangling in midair? Fuse 21 also powers the glovebox light and rechargeable flashlight circuit. If it's touching anything metal it could be blowing the fuse.

              Originally posted by whysimon
              WTF is hello Kitty (I'm 28 with no kids and I don't have cable)

              Comment


                #8
                Thats what I read too, but they aren't touching anything! This is very frustrating. Is 21 suppose to be getting 12 volts with the key out?
                1987 325is - sold
                2001 330i - New DD

                Comment


                  #9
                  Yes, fuse 21 is always hot.

                  Originally posted by whysimon
                  WTF is hello Kitty (I'm 28 with no kids and I don't have cable)

                  Comment


                    #10
                    Ok I solved the problem. There was a loose wire in the engine bay that I overlooked earlier. I taped up the end and now there's no more problems with 21, but there is still no fuel going to the engine. Do you think me not wiring in the C104 has anything to do with this or could it possibly be a bad DME?
                    1987 325is - sold
                    2001 330i - New DD

                    Comment


                      #11
                      I just tested the DME on a friend's car and it works fine so there is no problem there. I am starting to think that the problem has to do with the engine wiring. I bought a bare engine with no harness so I used the DOHC Wiki to wire the thing up.

                      this is what I used

                      oil pressure sensor BRN/GRN or BRN/GRY
                      front coolant temperature sensor (ECU) BRN/RED BRN
                      rear coolant temperature sensor (Gauge Sensor) BRN/YEL BRN/VIO
                      crank position sensor YEL
                      cam position sensor YEL RED/WHT BRN/ORG
                      VANOS solenoid RED/WHT GRN/BLU
                      knock sensor, 1-3 BLK NCA DME PIN 70
                      knock sensor, 4-6 BLK NCA DME PIN 69
                      throttle position sensor (TPS) BRN BRN/BLK RED/YEL
                      intake air temperature (IAT) sensor BRN GRY
                      idle control valve (ICV) WHT/YEL RED/WHT WHT/GRN
                      Evaporative emissions valve BRN RED/WHT

                      anybody see anything wrong?
                      1987 325is - sold
                      2001 330i - New DD

                      Comment


                        #12
                        I wrote that chart on the wiki, and I used it to wire my car up with a 1994 325i E36 manual harness.

                        Is the engine block ground hooked up? Also, are the power and ground wires that are are part of the diagnostic connector cable hooked up?

                        Originally posted by whysimon
                        WTF is hello Kitty (I'm 28 with no kids and I don't have cable)

                        Comment


                          #13
                          Yes engine is grounded, power and ground wires are hooked up too.

                          I've read about problems with the CPS maybe I need to test that. Also I only have the one temp sensor in the block for the Instrument cluster, the brown one. People have posted that i two temp sensors in the block because the DME needs one? I thought the DME uses the sensor in the radiator. I do have that one hooked in.
                          1987 325is - sold
                          2001 330i - New DD

                          Comment


                            #14
                            The DME sensor is the blue colored sensor in the head. The dual temperature sensor/switch installed in the radiator is solely for the operation of the electric fan. Whether or not this would cause a no-start, I'm not sure.

                            Originally posted by whysimon
                            WTF is hello Kitty (I'm 28 with no kids and I don't have cable)

                            Comment


                              #15
                              Yeah I dont think it would cause a no start. I need to check out the CPS tomorrow and go through all of those plugs again.
                              1987 325is - sold
                              2001 330i - New DD

                              Comment

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