Announcement

Collapse
No announcement yet.

M30 Running Too Rich and Misfiring

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    M30 Running Too Rich and Misfiring

    Hey,

    My e28 is running really rich and I can't get figure out why. It also misfires under load, it won't at idle. Runs rich at idle but no misfire.

    Parts I've replaced:
    Ignition Coil
    Spark Plugs
    Distributor Cap and Rotor
    Spark Plug Wires
    Fuel Injectors
    In-tank fuel pump
    Fuel filter
    Coolant Temp Sensor
    Replaced the crank sensors
    Tried a different ECU
    Tried different AFM's with no luck

    Any help is appreciated.

    Thanks
    Ashar


    BUY MY WHEELS! BBS E50s!!
    http://www.r3vlimited.com/board/showthread.php?t=275407

    Originally posted by Lurker27
    Any man will tell you being blown is better than being stroked.

    #2
    What's your compression numbers?

    Comment


      #3
      Haven't done a compression test yet.


      BUY MY WHEELS! BBS E50s!!
      http://www.r3vlimited.com/board/showthread.php?t=275407

      Originally posted by Lurker27
      Any man will tell you being blown is better than being stroked.

      Comment


        #4
        O2 sensor. When they go bad, the car will run rich.
        sigpic

        Comment


          #5
          Unplugged it, made the car run a little more rich.


          BUY MY WHEELS! BBS E50s!!
          http://www.r3vlimited.com/board/showthread.php?t=275407

          Originally posted by Lurker27
          Any man will tell you being blown is better than being stroked.

          Comment


            #6
            535, 533, 528? Euro, or American? What engine number? B32, 34, 35? All have different engine systems, although very similar.

            sigpic

            Comment


              #7
              85 535i, M30B34, American.


              BUY MY WHEELS! BBS E50s!!
              http://www.r3vlimited.com/board/showthread.php?t=275407

              Originally posted by Lurker27
              Any man will tell you being blown is better than being stroked.

              Comment


                #8
                Have you also checked te coolant temp switch? Not sensor. It's the two prong guy next to te cts. A good way to check temp switch is to jump te connectors and if idle changes and smoothes out you know what to replace. Just a free check to see if it's bad.

                Also check for vac leaks around the intake tract, those rubber pieces may not show signs of being cracked, but once warm, can begin to cause all kinda of vac leaks.

                sigpic

                Comment


                  #9
                  Any update? You get this sorted out?

                  sigpic

                  Comment


                    #10
                    Originally posted by 1craze30 View Post
                    Any update? You get this sorted out?
                    Yup, I swapped out the ecu with an edu out of my parts car and it runs well. Still a tad bit rich, but nothing serious.


                    BUY MY WHEELS! BBS E50s!!
                    http://www.r3vlimited.com/board/showthread.php?t=275407

                    Originally posted by Lurker27
                    Any man will tell you being blown is better than being stroked.

                    Comment


                      #11
                      Does it run rich after warmed up? My M30 runs pig rich at warm up - so much so, you can smell it. I think my cat is worn out, and maybe the OCV valve need a cleaning. But still pulls strong that I don't wan to mess with things right now.

                      My guess for you would be the o2 sensor. It will go open loop, and just spit fuel in.
                      Originally posted by Matt-B
                      hey does anyone know anyone who gets upset and makes electronics?

                      Comment

                      Working...
                      X