I hate wiring, Help me 4x4 my IX! No Spark, FML

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • accident
    R3V OG
    • Sep 2008
    • 7303

    #46
    the OBC doesnt stop spark, it cuts the fuel pump. jake sorry i didnt get back to you this weekend, shit got hectic. let me know when you're free again and i'll try to make it

    Originally posted by ROLLingKING
    i have a bronzit and plan on making it look sweet.
    Originally posted by slammin.e28
    Moral of this story?

    If you drive your e30 on stairs, you're gonna have a bad time.

    Comment

    • DaveSmed
      E30 Fanatic
      • Apr 2007
      • 1406

      #47
      Originally posted by accident
      the OBC doesnt stop spark, it cuts the fuel pump. jake sorry i didnt get back to you this weekend, shit got hectic. let me know when you're free again and i'll try to make it
      This is incorrect.

      The OBC interrupts power to the coil and pin 27 of the DME for MY88 E30s. Earlier cars it just interrupts pin 27. No cars disable the fuel pump.


      With that said, your car being an 88 pin 27 and the coil are on the same circuit.

      That single honk.... Does it sound like the normal E30 horn or higher pitched like a honda for example? Is there any modified wiring going into the black box?
      -Dave
      2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

      Need some help figuring out the ETM?

      Comment

      • DaveSmed
        E30 Fanatic
        • Apr 2007
        • 1406

        #48
        Hmm, that black connector with two wires looks like C136, There should be a single wire connector floating around somewhere, C131.... What the heck is that white one?
        -Dave
        2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

        Need some help figuring out the ETM?

        Comment

        • JakeP
          Grease Monkey
          • Oct 2010
          • 315

          #49
          DaveSmed: I guess the horn sounds like a stock E30, but this is my first BMW...
          I haven't found an alarm if that's what you're hinting at. Wiring going into the black box is unmodified and switching a working black box doesn't change anything. Found some wires eaten by a rat, spliced them back together and no difference.

          Here's the current symptoms in the most logical order:
          No start
          No spark
          No power to coil
          No power to pin #27
          OBC doesn't light up


          Randoms:
          Horn fuse blows if I try to use it
          Injectors wont click when I ground pins 15/16 on the DME connector
          Horn honks when I turn the key to ON position and again when the key goes from start to ON position


          Good things:
          Have fuel at fuel pressure regulator outlet
          have power/ground pretty much everywhere else it's required
          Motor turns over, just won't fire up.

          Comment

          • JakeP
            Grease Monkey
            • Oct 2010
            • 315

            #50
            Obc turns on, but dim. Tried a junkyard obc, its bright, but neither of them start the car or give power to pin 27.

            Comment

            • DaveSmed
              E30 Fanatic
              • Apr 2007
              • 1406

              #51
              Originally posted by JakeP
              DaveSmed: I guess the horn sounds like a stock E30, but this is my first BMW...
              I haven't found an alarm if that's what you're hinting at.
              Shoot, so much for the easy idea. :D

              Originally posted by JakeP
              Wiring going into the black box is unmodified and switching a working black box doesn't change anything.
              The OBC is screwy for some reason. That box is supposed to pass through in the event of a dead OBC.

              Originally posted by JakeP
              Found some wires eaten by a rat, spliced them back together and no difference.
              Hell that could cause anything. Why do they eat wires???

              Originally posted by JakeP
              Here's the current symptoms in the most logical order:
              No start
              No spark
              No power to coil
              No power to pin #27
              OBC doesn't light up
              First four are due to pin 27. Last one is interesting. The lightbulb could just be burned out. Shine a flashlight directly at the display, see if it says ----UHR (ok) or ----CODE (not ok)

              Originally posted by JakeP
              Randoms:
              Horn fuse blows if I try to use it
              Hell that could be anything, BUT! it also tells me its not the normal horn beeping at you, which means its the OBC horn. Which is controlled through the same black box. Interesting.

              Originally posted by JakeP
              Injectors wont click when I ground pins 15/16 on the DME connector
              Expected. The DME is not energizing the main relay.

              Originally posted by JakeP
              Horn honks when I turn the key to ON position and again when the key goes from start to ON position
              That is friggin weird. It is NOT supposed to do that, in any mode. What the hell is that thing up to?

              Originally posted by JakeP
              Good things:
              Have fuel at fuel pressure regulator outlet
              Que? As in fuel pump turning on? That's not supposed to happen w/o the main relay OR DME.

              Originally posted by JakeP
              have power/ground pretty much everywhere else it's required
              Motor turns over, just won't fire up.
              Man if that's not a frustrating situation....

              Hopefully we can figure it out!
              -Dave
              2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

              Need some help figuring out the ETM?

              Comment

              • DaveSmed
                E30 Fanatic
                • Apr 2007
                • 1406

                #52
                Still beep with the new OBC?
                -Dave
                2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

                Need some help figuring out the ETM?

                Comment

                • DaveSmed
                  E30 Fanatic
                  • Apr 2007
                  • 1406

                  #53
                  Here's the diagram of everything that black box is up to. Try unplugging C1

                  The arrow going off to "Injection Electronics" is your Ignition coil.
                  Attached Files
                  -Dave
                  2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

                  Need some help figuring out the ETM?

                  Comment

                  • Hellabad
                    E30 Modder
                    • Aug 2008
                    • 807

                    #54
                    I would run a (fused) jumper from + on the coil to the + battery jump stud, and turn the key.

                    This will back 12 v all the way down the line and light up lots of things, hopefully even the coil.

                    I like this idea because it takes about 1 minute and gets lots of scenarios out of the way.
                    Here is my photo gallery answering common questions about Ground Control Suspension, and e30 suspension problems in general.
                    Ground Control Gallery

                    The Ground Control facebook page: Dragged, kicking and screaming into social media to see what happens next.
                    Ground Control facebook page

                    Comment

                    • JakeP
                      Grease Monkey
                      • Oct 2010
                      • 315

                      #55
                      Ok, to clarify a couple things (cause I suck at BMW's): I got fuel to the rail by jumping the relay. It won't pump by itself.

                      Both OBC's turn on with the key in the on position and say ----UHR, but one of them is just dim.

                      Horn honks with both OBC's.

                      How do I read that chart? I see C1 near the OBC control module, but what wires are they, or what does the plug look like?

                      Hellabad: hmmmmm, that sounds really tempting. I would be afraid that it would screw something up though.

                      Comment

                      • Danny
                        Moderator
                        • Feb 2008
                        • 14217

                        #56
                        When you turn the key to on, is there a check engine light?

                        Comment

                        • JakeP
                          Grease Monkey
                          • Oct 2010
                          • 315

                          #57
                          I don't believe so. Only the CHECK light. (flashing)

                          Comment

                          • Danny
                            Moderator
                            • Feb 2008
                            • 14217

                            #58
                            Yes its bad. It means something is fucked up with the grounds.

                            For me it meant replacing the 3 realys.

                            Comment

                            • JakeP
                              Grease Monkey
                              • Oct 2010
                              • 315

                              #59
                              I've tried swapping the 3 relays near the overflow reservoir. :(

                              Comment

                              • Danny
                                Moderator
                                • Feb 2008
                                • 14217

                                #60
                                Welp, that's all the help i have for you.

                                Comment

                                Working...