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1983 650 spark ?

Discussion in 'XJ Technical Chat' started by Travis Roberts, Mar 12, 2019.

  1. Travis Roberts

    Travis Roberts New Member

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    what would cause only one plug to fire per coil? already put new ngk plugs and caps on.
     
    Travis Roberts, Mar 12, 2019
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  2. k-moe

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

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    Are you looking at the pairs correctly when you check for spark? (be sure to only remove one plug at a time to reduce the risk of TCI damage)
    1 and 4 are a pair, and 2 and 3 are the other pair.

    If you are checking the pairs correctly then the most likely cause for your problem is plug wires that have pinholes or cracks in the insulation, allowing a jump to ground before reaching the plug.

    Swap the plugs around too. Even new plugs can be bad.
     
    k-moe, Mar 12, 2019
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