help: running on 3 cylinders

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  • dmjensen
    Mod Crazy
    • Jan 2011
    • 799

    #1

    help: running on 3 cylinders

    Alright so the other morning im on my way to class, minding my own bussiness driving my e30 when it starts to putter and have power loss. Right away i could tell one cylinder wasnt firing. After school i get home and pull all the plugs and cyl #5 is soaked in fuel.

    So far i've checked the wires, #5 was dead. So i replaced those today. And still doesnt run right. Yesterday i cleaned my cap wich is new as of last fall, and checked my rotor.

    Regaped all of my plugs to .023". Also its FI with MS ecu, but ive never had this happen before so i dont think it has anything to do with the management.

    What could cause this to happen?

    I havent replaced or checked my coil, and i just had the head off and deck decked along with a valve job. My dad says i might have a valve stuck open buy wouldnt it still ignite the fuel if i have spark? (which i do)
  • george graves
    I waste 90% of my day here and all I got was this stupid title
    • Oct 2003
    • 19986

    #2
    My m20 had it's fuel rail harness(electrical connectors) coming loose when I bought it - so it ran like a dog.
    Originally posted by Matt-B
    hey does anyone know anyone who gets upset and makes electronics?

    Comment

    • dmjensen
      Mod Crazy
      • Jan 2011
      • 799

      #3
      I havent checked that, but it could be a possibillity

      Comment

      • Gregs///M
        Forum Sponsor
        • Mar 2012
        • 2459

        #4
        Leaky fuel injectors. Try doing a compression test too.
        Owner - Bavarian Restoration
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        www.BavRest.com
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        Comment

        • B-well
          E30 Enthusiast
          • Oct 2010
          • 1042

          #5
          or clogged fuel injectors

          Comment

          • dmjensen
            Mod Crazy
            • Jan 2011
            • 799

            #6
            they're brand new 42lb lucas injectors, i'd hope they wouldn't leak or be clogged... :(

            I'll do a compression test today and get back to this if it isn't the problem.

            Comment

            • jlevie
              R3V OG
              • Nov 2006
              • 13530

              #7
              What do the logs in the MS say is happening? What are compression and leak down numbers from the engine?
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

              Comment

              • UserError
                Member
                • Mar 2011
                • 86

                #8
                42lb injectors? Hoo boy, that's more than twice the output of the stock ones. We might need the mod list for your motor.

                Comment

                • dmjensen
                  Mod Crazy
                  • Jan 2011
                  • 799

                  #9
                  well i ruled out pretty much everything besides taking off the head and taking a look...

                  put on new wires, cap and rotor are fine, switched plugs, regaped plugs, valve clearance is good, injectors all checked out fine, i even switched one that i knew was spraying good with #5, checked my fuel rail harness, even dropped the exhaust to see if there was too much back pressure...

                  compression:
                  #1 150 #2 160 #3 177 #4 163 #5 130 #6 165

                  that's right on the mark with number 5 cylinder...

                  Comment

                  • gp.plus
                    E30 Addict
                    • Mar 2010
                    • 416

                    #10
                    I had a very similar problem and after finally pulling the head, I found the head gasket had blown between 5&6.

                    Comment

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