Misfire under load

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  • Court M3
    R3V OG
    • Jan 2004
    • 6713

    #1

    Misfire under load

    -The car starts up is without any problems, but under load has a misfire and once warmed is more pronounced.


    Checked a few things today to see if there's anything I could do to fix it:

    Removed and checked the plenum to check for leaks (none found)
    Checked plugs and wires for correct resistance measurements (all checked ok)

    It was getting late so wrapped it up and tomorrow going to check TPS and CPS.

    Any other recommendations?
    Continuous For Sale Thread
    323i s50
  • MrBurgundy
    R3V Elite
    • Mar 2012
    • 5290

    #2
    In my experience, most "mis under load" situations are traced to the ignition system.

    Your TPS isn't going to cause a misfire problem.

    Check your CPS resistance and also visually inspect the wire up and down to see if one of the three wires are broken or breaking.

    IDK if you pulled out all your plugs, but if you haven't, pull out each one and inspect for excessive fouling.
    Current Collection: 1990 325is // 1987 325i Vert // 2003 525i 5spd // 1985 380SL // 1992 Ranger 5spd // 2005 Avalanche // 2024 Honda Grom SP // 2024 Yamaha XSR700 // 2024 Jeep Gladiator Rubicon

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    • Court M3
      R3V OG
      • Jan 2004
      • 6713

      #3
      Makes more sense, I'll start with plugs since I have a set only need time now...
      Continuous For Sale Thread
      323i s50

      Comment

      • Massive Lee
        R3V OG
        • Sep 2006
        • 6782

        #4
        Bad sparkplug wires or sparkplugs. I suggest the wires. ;-)
        Brake harder. Go faster. No shit.

        massivebrakes.com

        http://www.facebook.com/pages/Massiv...78417442267056





        Comment

        • Court M3
          R3V OG
          • Jan 2004
          • 6713

          #5
          Follow-up, wires it was Lee! Thanks for the tip
          Continuous For Sale Thread
          323i s50

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