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M20b25 starting rough (TPS Code)

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    M20b25 starting rough (TPS Code)

    I recently purchased an E30 and it runs decent, but stutters and bogs every great while and the CEL illuminates every trip. I used the stomp method to pull the code and it was...

    Long blink (I believe that would count as a 1)
    pause:
    One long blink
    pause:
    2 Long blinks
    Pause:
    Six short blinks

    I have no idea why this code is not showing on the CEL FAQ, but I believe its the TPS sensor. It makes sense that the potentiometer is getting stuck and not reading the correct throttle position. The car is a 89' 325i all stock 5spd with an M20b25.

    This is the site I am working off of. http://e30world.com/fuel/BMW-E30-DME...ic-fault-codes
    EG Hatch- ITR Powered, 4 door Gs-R-stock, 89' 325i

    #2
    I also wanted to mention I tried cleaning the pins and the connectors and it did not help. I believe I need a TPS (3 wire), i would just like others opinions.
    EG Hatch- ITR Powered, 4 door Gs-R-stock, 89' 325i

    Comment


      #3
      hesitating could also be linked to the MAF. you have to cut the silicon glue off. you also have to clean the copper and bend the needle so it makes good, fresh contact. should help with that.
      '84 325e - "Elizabeth"
      '87 325e (SHELL) - "Sleeping Beauty" - COMPLETE PROJECT PART-OUT - S54, 5-LUG, and MORE

      sigpic

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        #4
        Thanks for the info.
        EG Hatch- ITR Powered, 4 door Gs-R-stock, 89' 325i

        Comment


          #5
          I would not suspect the TPS. It's a "dumb" two position switch, idle and wide open. All load data is from the airflow meter.
          -Dave
          2003 Lincoln Towncar | 1992 BMW 325iC | 1968 Cadillac Deville

          Need some help figuring out the ETM?

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            #6
            What exactly is the "airflow" meter? Are you referring to an O2 sensor. And my code indicates a TPS issue
            EG Hatch- ITR Powered, 4 door Gs-R-stock, 89' 325i

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              #7
              This is the maf it is located on the intake before the throttle. It lets the ecu know how much air is coming into the engine and will effect fuel injection. A defective maf will also cause the symptoms you describe.




              The Build:
              http://www.r3vlimited.com/board/showthread.php?t=191125

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                #8
                Awesome, I will look into that also.
                EG Hatch- ITR Powered, 4 door Gs-R-stock, 89' 325i

                Comment


                  #9
                  Curious how the stomp test would work if the tps is bad?
                  sigpic
                  Parts Wanted
                  The Never-ending Resto Mod

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                    #10
                    It illuminates a code. My code indicated it was a TPS issue.
                    EG Hatch- ITR Powered, 4 door Gs-R-stock, 89' 325i

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                      #11
                      That code is wrong. Google e30stomp test and read. The long blink is the sign it's entering in to the diagnostic mode.

                      Comment


                        #12
                        Originally posted by Mr. EG View Post
                        It illuminates a code. My code indicated it was a TPS issue.
                        What I meant is the a functioning TPS sensor is a prerequisite to the stomp test working. If it doesnt register WOT and closed throttle, the stomp test wont work.
                        sigpic
                        Parts Wanted
                        The Never-ending Resto Mod

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                          #13
                          I believe it gets stuck in certain RPM ranges (potentiometer issue). I will be replacing both the AFM and the TPS.
                          EG Hatch- ITR Powered, 4 door Gs-R-stock, 89' 325i

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