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Strange one - 2 & 4 misfiring

Discussion in 'XJ Technical Chat' started by Alive, Jun 17, 2018.

  1. Alive

    Alive Active Member

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    Ok so I put my 84 XJ900 on the road recently with new aftermarket coils and now when I ride its sluggish and when I touch the headers, 1 & 3 burn but 2 & 4 are relatively cold.

    The coils weren't a straight swap, I had to make up a couple of small brackets and short wires to connect them, but they did go in relatively easily and have worked ok for a couple of months (I did notice No.2 pipe was cold last week so put new iridium plugs in it).

    Any ideas before I take it to a mechanic?

    Thanks
     
    Alive, Jun 17, 2018
    #1
  2. Jetfixer

    Jetfixer Well-Known Member

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    My experience with iridium plugs in motorcycle is not good , put a pair in my virago the tip melted off . Switched to Autolite AP63 and it ran great . Today my 2011 chevy Hhr had a bad miss fire and the traction control was showing service ESC . Pulled plugs number 4 electrode melted off these were NGK , stock were AC delco switched back so far so good . Not the best pictures but I would suggest switching to standard copper core plug and see if your bike runs better.
     

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    Jetfixer, Jun 17, 2018
    #2
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  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    +1 get new spark plugs of the correct type.
     
    k-moe, Jun 17, 2018
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  4. Alive

    Alive Active Member

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    I switched back to the original plugs and No. 4 is now firing... Looking a lot like N0. 2 is a dodgy coil... Have to test it

    Thanks guys
     
    Alive, Jun 18, 2018
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  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Swap that #4 plug to #2 and see if the problem follows the plug.
    If not, then unscrew the plug cap and trim the lead back a bit, then reinstall (check the cap resistance at the same time). Also check that the plug wire if firmly connected at the coil.
    If the coil fires #3, then the coil itself is not the problem.
     
    k-moe, Jun 18, 2018
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