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Low on Power (obd1 m52)

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    #46
    aww ok
    1990 325is
    m52b28
    3.73lsd
    g260 (1987 325is 5spd tranny)

    Comment


      #47
      Need some new ideas.

      Car still is shitty for power. Getting 13 mpg. I hate everything lol

      I will be cutting the wiring to my o2 next to see if anything changes since its spliced in. If not....idk what to do next except for a new harness.
      Current:
      1989 325i
      1988 M3
      1987 325ic
      Past:
      2001 330ci
      2001 M3

      Comment


        #48
        I was gonna take mine into the shop, but the guy there said I need to get the O2 sensor to where it is reading from all cylinders. Right now the stock exhaust manifolds are being using and the O2 sensor is plugged into the front one. So I dont have the reading of the back 3 exhausts ports.

        So need to do that then I can take it to them to see what's up.
        1990 325is
        m52b28
        3.73lsd
        g260 (1987 325is 5spd tranny)

        Comment


          #49
          is this right for the ground on the main relay? ignition is off completely

          This is "Untitled" by Jonathan Hauri on Vimeo, the home for high quality videos and the people who love them.
          Last edited by jhaurimn; 04-10-2018, 06:40 PM.
          Current:
          1989 325i
          1988 M3
          1987 325ic
          Past:
          2001 330ci
          2001 M3

          Comment


            #50
            Vacuum test completed yesterday, everything seemed correct which would indicate no exhaust restriction, and i believe no vacuum leaks.

            car has its good days and bad days.

            when I drive with the maf unplugged, does it go into the same open-loop as if I unplugged my o2 sensor?
            Current:
            1989 325i
            1988 M3
            1987 325ic
            Past:
            2001 330ci
            2001 M3

            Comment


              #51
              i know everyone is sick of seeing this thread popping up....but just throw random shit out there. ill try it at this point. im getting close to bringing it to a shop lol.

              Things i havent tried but plan on trying as soon as weather cooperates :

              disconnecting o2
              replacing vanos seals (i know this would give bad mpg, but cutting mpg in half? seems excessive)
              new engine harness (might go obd2 at that point)
              Current:
              1989 325i
              1988 M3
              1987 325ic
              Past:
              2001 330ci
              2001 M3

              Comment


                #52
                im waiting for the headers to come in and then do a custom exhaust on it.
                1990 325is
                m52b28
                3.73lsd
                g260 (1987 325is 5spd tranny)

                Comment


                  #53
                  So back during winter when it was cold and minnesota was using their less efficient winter gas, I was going about 120 miles max off 9 gallons of gas. (13.3 mpg)

                  Now that summer gas is back, I am back up to 180 miles on 8.5 gallons of gas. (21.1 mpg)

                  I'm still having power issues down low, so I plan to do vanos seals next. But I find it odd how just having warmer weather and better gas improved my mpg by that much.
                  Current:
                  1989 325i
                  1988 M3
                  1987 325ic
                  Past:
                  2001 330ci
                  2001 M3

                  Comment


                    #54
                    That is pretty weird, which octane of fuel are you using?
                    1990 325is
                    m52b28
                    3.73lsd
                    g260 (1987 325is 5spd tranny)

                    Comment


                      #55
                      Got word from the mechanic. The MAF sensor is bad. He replaced it and now it's running great and no more CEL, 1222.
                      1990 325is
                      m52b28
                      3.73lsd
                      g260 (1987 325is 5spd tranny)

                      Comment

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