Need help. O2 heater ground melted

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  • rneedham1979
    E30 Modder
    • Jul 2008
    • 852
    #1

    Need help. O2 heater ground melted

    Gents,

    I am having an issue with the O2 heater ground wire melting. When i installed the engine, I drove the car for a few days without issue. One day in the driveway, the ground wire (grounded by the DME) melted causing a huge mess in the wiring harness. I rewired it and drove the car for 500-750 miles without incident. One night, it did the same thing. It just melts the ground wire from the DME to the O2 heater relay.

    Since then, I removed the relay and have driven the car another 1-1500 miles or so without incident. I really want to get this resolved to avoid issue. The car runs fine not but the idle/ drive-ability suffers when cold.

    -S52 OBDI
    -O2 wiring is perfect. No issues, not cut, pinched or grounded wires.
    -O2 heater/relay wiring is fine. No identifiable issues.

    Anyone have any ideas?

    Thanks,
    Ryan
    Turbo E30
    Roadkill 80lb 93 octane OBDI tune
    BavSol Cylinder Head
    Stock S50 in. cam Schrick ex. cam
    Otis' tubular T4 manifold
    Oringed 87mm S52, Eagle rods and 8.5:1 CP pistons.
    GT4094r w/Batmowheel Impeller
    614whp@17.5psi, 100 Oct
    690whp@21psi, 100 Oct
    801whp@27psi, 110 URT
    Old: 1/4 mile: 10.91@144.38 (636whp)
    New: ?
    http://www.youtube.com/watch?v=L_f7fUVqblI
    Tags: None
    • Jand3rson
      Banned
      • Oct 2003
      • 37587
      #2
      Do you possibly have a ground hooked to power by accident somewhere? Possibly related or not, but the first time we had my motor all hooked up, we had a ground hooked to power by accident, and as soon as we hooked up the battery, it melted a wire all the way from the oil level sensor down at the pan up to the main harness up on the firewall.

        Comment

        • rneedham1979
          E30 Modder
          • Jul 2008
          • 852
          #3
          I really don't think so. Didn't rewire anything when we installed the engine. I'm kind of at a loss. No idea what could be causing this... man, its annoying!
          Turbo E30
          Roadkill 80lb 93 octane OBDI tune
          BavSol Cylinder Head
          Stock S50 in. cam Schrick ex. cam
          Otis' tubular T4 manifold
          Oringed 87mm S52, Eagle rods and 8.5:1 CP pistons.
          GT4094r w/Batmowheel Impeller
          614whp@17.5psi, 100 Oct
          690whp@21psi, 100 Oct
          801whp@27psi, 110 URT
          Old: 1/4 mile: 10.91@144.38 (636whp)
          New: ?
          http://www.youtube.com/watch?v=L_f7fUVqblI

            Comment

            • 328ijunkie
              Forum Sponsor
              • May 2007
              • 3961
              #4
              Wrong relay?

              Check Us out on Facebook
              Needing a harness adapter or wiring help? Check it out: also have 24v motor mounts, E30 M3 covers and E36 ECU mounts!
              Full Product Line Tuning
              OBD2 Tuning Available! OBD2 E36, S54 Swap, S62 Swap, etc: tuning@MarkertMotorWorks.com Dyno Thread

                Comment

                • rneedham1979
                  E30 Modder
                  • Jul 2008
                  • 852
                  #5
                  Originally posted by 328ijunkie
                  Wrong relay?
                  No man, it was the same one I've always used.
                  Turbo E30
                  Roadkill 80lb 93 octane OBDI tune
                  BavSol Cylinder Head
                  Stock S50 in. cam Schrick ex. cam
                  Otis' tubular T4 manifold
                  Oringed 87mm S52, Eagle rods and 8.5:1 CP pistons.
                  GT4094r w/Batmowheel Impeller
                  614whp@17.5psi, 100 Oct
                  690whp@21psi, 100 Oct
                  801whp@27psi, 110 URT
                  Old: 1/4 mile: 10.91@144.38 (636whp)
                  New: ?
                  http://www.youtube.com/watch?v=L_f7fUVqblI

                    Comment

                    • 328ijunkie
                      Forum Sponsor
                      • May 2007
                      • 3961
                      #6
                      ECU prob has issues. Another reason the 413's are annoying. Open and inspect for corrosion/water damage. THis causes all sorts of crazy issues.

                      Check Us out on Facebook
                      Needing a harness adapter or wiring help? Check it out: also have 24v motor mounts, E30 M3 covers and E36 ECU mounts!
                      Full Product Line Tuning
                      OBD2 Tuning Available! OBD2 E36, S54 Swap, S62 Swap, etc: tuning@MarkertMotorWorks.com Dyno Thread

                        Comment

                        • rneedham1979
                          E30 Modder
                          • Jul 2008
                          • 852
                          #7
                          Originally posted by 328ijunkie
                          ECU prob has issues. Another reason the 413's are annoying. Open and inspect for corrosion/water damage. THis causes all sorts of crazy issues.
                          I'll have to look again but, I don't remember anything out of the ordinary in or around the ECU. I assume if it were the ECU I'd be experiencing another issue/ symptoms. No?
                          Last edited by rneedham1979; 11-13-2012, 05:42 PM.
                          Turbo E30
                          Roadkill 80lb 93 octane OBDI tune
                          BavSol Cylinder Head
                          Stock S50 in. cam Schrick ex. cam
                          Otis' tubular T4 manifold
                          Oringed 87mm S52, Eagle rods and 8.5:1 CP pistons.
                          GT4094r w/Batmowheel Impeller
                          614whp@17.5psi, 100 Oct
                          690whp@21psi, 100 Oct
                          801whp@27psi, 110 URT
                          Old: 1/4 mile: 10.91@144.38 (636whp)
                          New: ?
                          http://www.youtube.com/watch?v=L_f7fUVqblI

                            Comment

                            • 328ijunkie
                              Forum Sponsor
                              • May 2007
                              • 3961
                              #8
                              This is an issue/symptom lol :P

                              Check Us out on Facebook
                              Needing a harness adapter or wiring help? Check it out: also have 24v motor mounts, E30 M3 covers and E36 ECU mounts!
                              Full Product Line Tuning
                              OBD2 Tuning Available! OBD2 E36, S54 Swap, S62 Swap, etc: tuning@MarkertMotorWorks.com Dyno Thread

                                Comment

                                • rneedham1979
                                  E30 Modder
                                  • Jul 2008
                                  • 852
                                  #9
                                  Originally posted by 328ijunkie
                                  This is an issue/symptom lol :P
                                  I mean in addition. Maybe it's worth trying another 413
                                  Turbo E30
                                  Roadkill 80lb 93 octane OBDI tune
                                  BavSol Cylinder Head
                                  Stock S50 in. cam Schrick ex. cam
                                  Otis' tubular T4 manifold
                                  Oringed 87mm S52, Eagle rods and 8.5:1 CP pistons.
                                  GT4094r w/Batmowheel Impeller
                                  614whp@17.5psi, 100 Oct
                                  690whp@21psi, 100 Oct
                                  801whp@27psi, 110 URT
                                  Old: 1/4 mile: 10.91@144.38 (636whp)
                                  New: ?
                                  http://www.youtube.com/watch?v=L_f7fUVqblI

                                    Comment

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