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Fouling spark plugs

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    Fouling spark plugs

    I bought my 04 21i last fall. It's been fouling plugs and missing at lower speeds. I have replaced the plugs but it still does the same thing. I called a shop to schedule an appointment and they told me to replace the plugs with original parts, that you can't cross reference at a local parts store. Has anyone had this issue?

    #2
    Ac delco spark plug mr43LTS or NGK BPR6EFS for all engines except the 6.0. Fouling plugs is due to over-fueling which could also be caused by weak spark. Really tough to diagnose without an engine computer.
    Fixing everyone elses boat just so I can use mine...

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      #3
      Have you replaced your distributor cap and rotor?
      There seems to be many issues with this particular unit. I believe there is a venting issue and a crossfire issue (not sure if one causes the other) I just had mine cause me tons of grief as it looked ok visually.

      Jut a thought


      Sent from my iPhone using Tapatalk

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