m20 won't run right.

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  • zx5rider
    Noobie
    • Aug 2013
    • 2
    #1

    m20 won't run right.

    Okay so I bought a 1990 325is with a snapped timing belt and this is what I did....

    1. Replaced Timing belt - No start
    4. Removed Valve cover to find a broken rocker.
    3. Removed head and took it to a head shop and all the the exhaust valves were bent and 1 intake was bent
    4. Got that all replaced and bought a new rocker and head gasket set and put it together.
    5. Car starts right up wont idle once warm so I adjusted the AFM.
    6. Idles now but its really rough(engine seems smooth at higher RMPS)
    7. Unplugged the sparkplug wires one at a time while the engine was running which seemed to have no effect on it for cylinders 4, 5, and 6. (even with all at the same time)
    Cylinder 5 seems to be the only one that changes nothing no matter what and yes it has spark.

    Also I get a check engine with at idle most of the time. CEL 1215 I believe.

    Next step I was going to try was compression test then check the injector.....


    All advice is appreciated.
    Tags: None
    • delatlanta1281
      Dart Master
      • Mar 2006
      • 10317
      #2
      Test your o2 sensor.
      Smoke test for vacuum leaks.
      Yours truly,
      Rich
      sigpic
      Originally posted by Rigmaster
      you kids get off my lawn.....

        Comment

        • Bmr
          Grease Monkey
          • Jul 2009
          • 322
          #3
          Originally posted by delatlanta1281
          Test your o2 sensor.
          Smoke test for vacuum leaks.
          Agreed ^

          Vacuum leak or CPS faulty my thoughts.

            Comment

            • raleigh29
              Member
              • Apr 2009
              • 93
              #4
              check your TPS also
              03 M3 Vert
              89 325i

                Comment

                • ak-
                  R3V OG
                  • May 2009
                  • 12422
                  #5
                  I'd say check compression..

                  1991 325iS turbo

                    Comment

                    • evoeater88
                      Noobie
                      • Sep 2013
                      • 8
                      #6
                      I have a friend with the same prob. Fuel injectors are a common fault, but since the timing belt broke there could be other issues. I would check everything mentioned from everyone above ^

                        Comment

                        • Cabriolet
                          R3V OG
                          • Apr 2010
                          • 9620
                          #7
                          i would guess it's your injector harness.

                          the top goes through the metal, into the key, then the plastic retaining ring then the car side of the harness attaches. that was the issue i had one. it wasnt tight.
                          Much wow
                          I hate 4 doors

                            Comment

                            • Mthrizzle
                              Grease Monkey
                              • Oct 2007
                              • 390
                              #8
                              Originally posted by Cabriolet
                              i would guess it's your injector harness.

                              the top goes through the metal, into the key, then the plastic retaining ring then the car side of the harness attaches. that was the issue i had one. it wasnt tight.
                              2nd that...also unplug the harness and clean with electrical solvent...
                              check for injector pulse
                              remove injectors /cylinder affected and individually check to make sure they are spraying fuel

                              check for compression

                              update thread

                                Comment

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