Check engine light, WHY is it not on?

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  • matt
    No R3VLimiter
    • Oct 2003
    • 3731

    #16
    Originally posted by etxxz
    i did, so were a few other lights but they all went off after ignition ex the abs light (abs didnt quite work)...i wasn't running after-cat o2 sensors (obdII) for a while, then i added O2 sensor simulators and no change. what are your thoughts?
    I guess if its on when the car is off then off when the car is on, you are in the clear.

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    • DatUtahGuy
      No R3VLimiter
      • Jan 2007
      • 3146

      #17
      Sorry to revive an old ass thread but I feel it's better to contribute to this one than start a new one.

      I currently am having the same problem than some of you had, if the car idles for 15-20 seconds the check engine will come on, and usually the tach bounces slightly up and down. As soon as I give it gas, the light goes off. It does smell rich at times.

      I was guessing O2 sensor, did any of you find that was the problem?
      YOUTUBE: AR Perez
      - - -
      If lucky, the E36 will die peacefully, in its natural habitat, and be given the prestigious honor of donating its parts to an E30

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      • brandon11130
        Mod Crazy
        • Jan 2008
        • 635

        #18
        I have the AGK plug, and i dont have a check engine light at any key position. Im pretty sure they didnt include it.

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        • matt
          No R3VLimiter
          • Oct 2003
          • 3731

          #19
          Originally posted by Schwarz3
          Sorry to revive an old ass thread but I feel it's better to contribute to this one than start a new one.

          I currently am having the same problem than some of you had, if the car idles for 15-20 seconds the check engine will come on, and usually the tach bounces slightly up and down. As soon as I give it gas, the light goes off. It does smell rich at times.

          I was guessing O2 sensor, did any of you find that was the problem?
          What code does it show?

          Comment

          • DatUtahGuy
            No R3VLimiter
            • Jan 2007
            • 3146

            #20
            Lambda code, so basically the air/fuel ratio is off and the engine is trying to compensate.
            YOUTUBE: AR Perez
            - - -
            If lucky, the E36 will die peacefully, in its natural habitat, and be given the prestigious honor of donating its parts to an E30

            Comment

            • matt
              No R3VLimiter
              • Oct 2003
              • 3731

              #21
              Check for vacuum leaks. Do you have the correct fuel pressure and the correct injectors for your chip?

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