S50 swap has fuel injection, no spark

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  • e30Troop
    Member
    • Jan 2014
    • 64

    #1

    S50 swap has fuel injection, no spark

    Any other ideas as to why it doesn't start?

    Car ran well until dme got wet during a torrential rain storm. I replaced the original red label 413 dme with another from a fellow member.

    I have fuel pressure, fuel injection, but no spark.

    The car has the ews system transferred over from the engines donor car. I have a replacement red label dme with stock chip.

    It appears I have voltage TO the ignition coils. The 3 wires, when key on engine off I have 12.5 volts. When cranking I have about 10.6 volts. I ohmed the brown ground wire from the coil connector to the ground at the harness end by the vanos solenoid and I have about .6 ohms.

    I removed all the spark plugs and cleaned them.

    I got in contact with the p/o and the only difference with the dme is he had a chip from TMS for the larger euro hfm, when I looked at the part number for the chip, it was indeed only that, no ews delete. TMS part number 4131-3001.

    Only reason I have not put that chip in was that it was wet and showed some nastiness. I cleaned it up but fear if I install the chip in my new dme it may do harm.
    Anyone in the warwick ny area that may want to help is more than welcome! Please someone help because I'm at my wits end with this car and ready to call it quits.
  • ROME30
    Wrencher
    • May 2012
    • 242

    #2
    are you getting a check engine light when you turn the ignition to the ON position?

    Comment

    • e30Troop
      Member
      • Jan 2014
      • 64

      #3
      No check engine light

      Comment

      • RobertK
        Kicked cancer's ASS.
        • Jun 2005
        • 5864

        #4
        Originally posted by e30Troop
        No check engine light
        Then your DME is not getting switched 12v+. Check your DME relay.

        Comment

        • Mr Mpower
          Member
          • Aug 2011
          • 95

          #5
          that's a interesting detail! my car don't start ..i'll try it
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          • e30Troop
            Member
            • Jan 2014
            • 64

            #6
            No bulb in the check engine light spot. I didnt swap one in yet. But why would I have fuel pressure and injection but no spark? Red label 413 DME from a manual vehicle.

            Comment

            • e30Troop
              Member
              • Jan 2014
              • 64

              #7
              I put a bulb in the check engine light spot but the light doesn't come on. How do I jump the dme main relay or should I not mess with that?

              Comment

              • RobertK
                Kicked cancer's ASS.
                • Jun 2005
                • 5864

                #8
                Injection is controlled by the DME so if you are a 100% sure your injectors are firing then the DME is getting 12v+.

                Have you actually hooked a multimeter or test light to test at an injector connector to see if it is pulsing?

                Comment

                • e30Troop
                  Member
                  • Jan 2014
                  • 64

                  #9
                  I pulled the rail while I'm cranking and all of the injectors are pulsing fuel when cranking. I am missing the spark. After cranking for like 15-20 sec it will sound like it wants to catch then it'll go back to cranking, then occasionally it will catch and run. Once running, it runs amazing and won't stop till I turn it off

                  Comment

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