Finished M42 swap misfiring

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  • bkslaughterhouse
    Advanced Member
    • Oct 2011
    • 198

    #1

    Finished M42 swap misfiring

    I just finished putting my semi-built M42 into my friends 318 and it's misfiring pretty bad, it's not an irregular misfire at all. It sounds like a subaru now and lost all its power. Any suggestions?? Also my imbred friend who was trying to help pushed in the clutch while I had the engine out and destroyed the slave cyl :shock: So I put a new slave cyl in but now I can't bleed the clutch AT ALL! It's obviously full of brake fluid so I'm not sure what to do. Is there any way the master could've also been destroyed? Any suggestions hugely appreciated cause I gotta get this thing off my street asap 2 cops have already come and threatened me with some bs for working in the street :drink: :yawn:


    1980 320i
    1991 318is
    1997 328i sport
  • LuckyHenriksen
    R3V Elite
    • Jun 2010
    • 4244

    #2
    Check for vacuum leaks? Check the order of the plug wires? Is it timed correctly?


    Bahama Beige E23 Project
    Bluebird Bus Conversion
    New Oregon Trail

    Comment

    • e30austin
      I waste 90% of my day here and all I got was this stupid title
      • Sep 2010
      • 15382

      #3
      Check plug wires, compression, vacuum leaks, etc.

      Edit-- damn you Steven. Beat me to it.


      Comment

      • freeride53
        R3V OG
        • Jul 2007
        • 11972

        #4
        Make sure the plug wires are in correctly. remove them and install again.

        1991 BMW 318i (Old Shell RIP, Now Being Re-shelled & Reborn)
        1983 Peugeot 505 STI
        1992 Volvo 240 Wagon
        2009 Toyota 4Runner SR5 Sport 4WD

        Comment

        • freeride53
          R3V OG
          • Jul 2007
          • 11972

          #5
          Or vacuum leaks...i've encountered both...if it's vacuum leaks, its a big improvement doing the mess-under-intake mod to remove a bunch of hoses and geti it running efficienctly.

          1991 BMW 318i (Old Shell RIP, Now Being Re-shelled & Reborn)
          1983 Peugeot 505 STI
          1992 Volvo 240 Wagon
          2009 Toyota 4Runner SR5 Sport 4WD

          Comment

          • bkslaughterhouse
            Advanced Member
            • Oct 2011
            • 198

            #6
            It has a coil on plug kit and I'm positive they are all in right already screwed around with that. I know the timing isn't off cause I had in my car running awesome right before I put it in his. Also there are absolutely no vacuum leaks and all the hoses are hooked up right, positive i went over them a million (like 5) times.


            1980 320i
            1991 318is
            1997 328i sport

            Comment

            • bkslaughterhouse
              Advanced Member
              • Oct 2011
              • 198

              #7
              Also freeride, you have a badass setup of cars!!!!


              1980 320i
              1991 318is
              1997 328i sport

              Comment

              • e30austin
                I waste 90% of my day here and all I got was this stupid title
                • Sep 2010
                • 15382

                #8
                Time to check compression.


                Comment

                • LuckyHenriksen
                  R3V Elite
                  • Jun 2010
                  • 4244

                  #9
                  ^ yep. Possible stuck valve?


                  Bahama Beige E23 Project
                  Bluebird Bus Conversion
                  New Oregon Trail

                  Comment

                  • Ryann
                    No R3VLimiter
                    • Mar 2010
                    • 3350

                    #10
                    Pull the plug wires off of the coils one at a time until you find the dead hole, then pull that plug and check for fuel/spark, then compression test.

                    Comment

                    • LuckyHenriksen
                      R3V Elite
                      • Jun 2010
                      • 4244

                      #11
                      Originally posted by Ryann
                      Pull the plug wires off of the coils one at a time until you find the dead hole, then pull that plug and check for fuel/spark, then compression test.
                      This man knows his shit :)


                      Bahama Beige E23 Project
                      Bluebird Bus Conversion
                      New Oregon Trail

                      Comment

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