Crank but no spark. electrical humming

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  • 42000
    Wrencher
    • Jul 2012
    • 222
    #1

    Crank but no spark. electrical humming

    I was messing with the crank positing censor wire and the other wire on the front of the timing cover.. the conduit on one of the wires... not sure which.. cracked.. but the two wires inside seemed okay and i taped it up for protection

    now car cranks but will not start. no spark. i thought the battery was dead so i started charging it but was on and off getting this buzzing noise from the elctrical system... did i fry something?? maybe the wire for the cps just broke and now its not reading?? my friends dad was there and looked at the plugs while i cranked it but no sparkk...

    im supposed to be shipping my car and moving in a couple weeks so i am bugging out and just trying to figure this out....

    any advice??

    thanks!
    Tags: None
    • Ether-D
      R3VLimited
      • Sep 2011
      • 2838
      #2
      Did you unplug the other plug right next to where the cps connects to the harness? If you had them both unplugged, you could've gotten them backwards when you reattached them because they're exactly the same connector. Otherwise, the cps wire probably cracked.

      the buzzing is likely your iac valve. It's normal.

      edit: I always assume it's an m20b25
      Originally posted by Andy.B
      Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
      1987 325iS m30b34 Muscle car (Engine electrical phase)
      ~~~~~~~~~~
      I was born on 3/25…
      ~~~~~~~~~~

        Comment

        • 42000
          Wrencher
          • Jul 2012
          • 222
          #3
          its an m20b25...

          is it worth trying to splice a new piece into the wire for cps or just get a new one...

            Comment

            • Ether-D
              R3VLimited
              • Sep 2011
              • 2838
              #4
              New ones are cheap enough. But really swap the two connectors first and just try that.
              Originally posted by Andy.B
              Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
              1987 325iS m30b34 Muscle car (Engine electrical phase)
              ~~~~~~~~~~
              I was born on 3/25…
              ~~~~~~~~~~

                Comment

                • 42000
                  Wrencher
                  • Jul 2012
                  • 222
                  #5
                  okay

                  i dont think its that because i never disconnected the cps and i had the car starting until i messed with those wires todayy

                  i bought new plastic clips but i broke them trying to put that wire cover on.. it was really cold so the plastic was probably more brittle ..

                    Comment

                    • 42000
                      Wrencher
                      • Jul 2012
                      • 222
                      #6
                      okay

                      replaced the cps. still no start.

                      brand new cap, rotor, coil, wires.. the car started with all these parts a few days ago...

                      will the oil pressure sensor being faulty cut spark?

                      what should i look at next??

                        Comment

                        • 42000
                          Wrencher
                          • Jul 2012
                          • 222
                          #7
                          check the fuse on the positive to the battery...
                          that was fine...

                            Comment

                            • mpowerful
                              E30 Fanatic
                              • Jul 2013
                              • 1273
                              #8
                              Test power to the coil. Make sure your getting 12v to it.

                                Comment

                                • Jahman093
                                  Advanced Member
                                  • Sep 2012
                                  • 183
                                  #9
                                  Check the gap between cps and toothed wheel. It should be 1mm IIRC
                                  Test power to the coil. Make sure your getting 12v to it.
                                  try this. If you get 12v put a test light on the coil while cranking. If no the test light doesn't flash change out ecu for a known working one

                                    Comment

                                    • DetailAddict
                                      Wrencher
                                      • Apr 2011
                                      • 245
                                      #10
                                      try this flow...

                                      SpecE30 Community Forum
                                      http://spece30.com/forum/41-electrical-gauges-and-sensors/53136-no-start-no-spark-totally-stumped#53139


                                      I am having similar issue and have no idea what it is right now... :(

                                        Comment

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