e30 m50 swap. having issues plz help

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  • moska2204
    Noobie
    • Aug 2013
    • 21

    #1

    e30 m50 swap. having issues plz help

    hello guys. happy holidays. I need u guys help figuring out an issue. I have an 87 325is. my buddy just helped me do a m50 swap. everything was good for a day then 1 morning I get up warm up my car like usual(3-5 min) take off going to work. after about a 10 min drive, im taking off a red light and step on t7he gas and im getting a hesitation. I have the gas floored and the car doesnt respond. it doesn't turn off but its like if I had no power what so ever. then on the next light I tried taking off and it hesitates and shakes. I have 2 kinda play with the throttle so it can take off. it does it on all the gears but mainly on 1st thru 3rd. then if I turn off the car and let it sit for 10-20min it normal again and after 10-15 off running it starts with the same thing..



    I replaced cap and rotor, fuel filter, plugs, checked for vacuum leaks, checked the ohms on my coil(its good), new 4 gauge ground, its has new exhaust( no cat,2-1/2 inch pipe),

    if u guys have any suggestion plz shoot. thanks


  • frankie591
    E30 Addict
    • Feb 2012
    • 545

    #2
    I'm confused about how you have a cap and rotor with an m50 swap?

    Comment

    • franky2fingaz
      Advanced Member
      • Aug 2012
      • 117

      #3
      you need to do some checking:
      Fuel pressure (pump)/ fuel pressure regulator
      TPS voltage min/max
      MAF voltage
      All grounds and connections
      intake manifold to head


      OBD1 is nice but sensors need checking individually.. we need more info: repined or spliced harness?
      report back

      Comment

      • justin_l_
        E30 Enthusiast
        • Jun 2007
        • 1079

        #4
        Originally posted by frankie591
        I'm confused about how you have a cap and rotor with an m50 swap?

        Comment

        • moska2204
          Noobie
          • Aug 2013
          • 21

          #5
          Ok ima check all that tonight. We spliced the harness but only for the fuel pump. And for the MAF sensor convertion. Because my car is an 87(13 pin and 17 pin harness of a 88) today in the morning after 5 min it started acting up. I think is getting worse

          Comment

          • franky2fingaz
            Advanced Member
            • Aug 2012
            • 117

            #6
            just to clarify when I say "voltage" is not only 12v/ground but the signal input/output..

            Comment

            • jink0619
              E30 Modder
              • Dec 2011
              • 808

              #7
              My car did the samething you described, it would also shut off at times. Car would blog, hesitate and felt like was clogged, giving it full throttle wouldn't go anywhere. It was a bad MAF, the voltage was good but MAF itself was bad. Hope this helps
              sigpic
              E30love

              Comment

              • NickL
                E30 Addict
                • Jun 2009
                • 562

                #8
                Originally posted by moska2204
                Ok ima check all that tonight. We spliced the harness but only for the fuel pump. And for the MAF sensor convertion. Because my car is an 87(13 pin and 17 pin harness of a 88) today in the morning after 5 min it started acting up. I think is getting worse
                Judging by this post and the fact you said you changed the cap and rotor you don't have an m50...
                1987 325is - S52

                Comment

                • frankie591
                  E30 Addict
                  • Feb 2012
                  • 545

                  #9
                  Originally posted by NickL
                  Judging by this post and the fact you said you changed the cap and rotor you don't have an m50...

                  Maybe he has an m30? Or perhaps his friend took 2000 bucks from him, "swapped him an m50" but its still an m20 :giggle:

                  Comment

                  • moska2204
                    Noobie
                    • Aug 2013
                    • 21

                    #10
                    Sorry guys typo m30 swap. Yeah jink0619 ima check it because I'm going crazy over here.

                    Comment

                    • moska2204
                      Noobie
                      • Aug 2013
                      • 21

                      #11
                      Problem solved 02 sensor was burned. Thanks for all the info guys.

                      Comment

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