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Why is my m50 running pig rich

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    Why is my m50 running pig rich

    Confused, my m50nv is running so rich it's shooting flames...
    granted, I don't have an o2 sensor but neither have my last couple cars and that was never an issue...


    Cool temp sensor and sender are brand new, CPS is brand new, running 413 ECU since my 402 died. Harness checks out fine so I think it's a sensor somewhere, or DME? The only things that aren't new on the engine are the cam sensor, ICV, headgasket, and IAT... are any of those suspects?

    91 318i | 87 535iS

    #2
    Originally posted by ScHpAnKy View Post
    I don't have an o2 sensor

    ^ This would be my first guess.

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      #3
      You need an O2 sensor dude. M50 runs like utter shit without it anyway
      Originally posted by TSI
      ♫ Rust flecks are falling on my head...♫
      OEM+

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        #4
        Car can't make calculations. Rather than go lean (and EXPLODEEEEBOOMMM!), it protects itself and goes rich. Need dat o2 sensor. Rich > lean. It's a smart cookie.
        1974.5 Jensen Healey : 2003 330i/5

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          #5
          I don't get running a car with no O2 sensor. it's as critical to a modern EFI system as a MAF.
          Build thread

          Bimmerlabs

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            #6
            welp, if I can the LC-1 working with this, than I suppose that'll be my next step!

            thx all

            91 318i | 87 535iS

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              #7
              O2 Sensor. 413 ECU and a stuck injector are all prob your issues

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                #8
                Fuck it man. Flames are cool.
                91 318is M50 swapped
                05 Honda Pilot

                24V swap thread
                http://www.r3vlimited.com/board/showthread.php?t=302524

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                  #9
                  Originally posted by 328ijunkie View Post
                  O2 Sensor. 413 ECU and a stuck injector are all prob your issues
                  Stuck always on? I've got a shit ton of injectors I can swap in for free, but how do I figure out which one it is?

                  I just bought an LC-1, I understand I need to run the narrowband back to the DME for it to function as an O2 sensor and not just gauge?

                  Also, I have two 402 ECUs I can swap in, are they better than the 413?


                  Originally posted by Nick_S View Post
                  Fuck it man. Flames are cool.
                  Hell yes! But I only want them between shifts :P

                  91 318i | 87 535iS

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                    #10
                    My swap at it's early stages ran super rich and stumbled with a very touchy throttle. Maf sensor was the culprit for me after checking many of the things already mentioned.
                    sigpic

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                      #11
                      Pull the plugs, that should tell you which cylinders are running rich.

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                        #12
                        I was unaware that a 413 works on a NV.

                        COTM

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                          #13
                          Originally posted by N2MYE30 View Post
                          I was unaware that a 413 works on a NV.
                          I was unaware that the 413 didn't! :D
                          I know the later ones definitely don't work

                          91 318i | 87 535iS

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                            #14
                            + 1 on stuck injector. or it could be a fuel pressure regulator problem. If your fuel system is running at a higher psi, then more fuel is shot in a given injector cycle. Pull your injector rail and jump the fuel pump relay. If you see leaking fuel then you know what and where the problem is.

                            I dont think its an 02 sensor problem. It wont run optimally without one, but i dont think the computer is capable of overcorrecting so much that it will consistantly shoot flames.

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                              #15
                              Ok just watched the video. Dumping fuel at a fairly steady firing rate. I'm thinking fuel pressure too now. Unless you're building a funny car.
                              sigpic

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