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Spark issue

Discussion in 'XJ Technical Chat' started by Xj Bobber, Jun 7, 2018.

  1. Xj Bobber

    Xj Bobber Member

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    I have an xj550 been trying to figure out my spark problem. Ive replaced fuse box, coils, battery, plugs, gone over the wiring harness. Im at the end of my rope. Thanks in advance.
     
    Xj Bobber, Jun 7, 2018
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  2. steber

    steber Active Member

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    You going any spark from my of the plug??
     
    steber, Jun 7, 2018
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  3. SQLGuy

    SQLGuy Well-Known Member

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    SQLGuy, Jun 7, 2018
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  4. cgutz

    cgutz Well-Known Member

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    I had a bad resistor in one of the sparkplug caps, it wasn't passing any current. Did you remove the sparkplug cap from the wire (it unscrews) and try an ohm meter on it? Mine was open circuit.

    I ended up replacing all the sparkplug caps, bike ran better.
     
    cgutz, Jun 8, 2018
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  5. Rooster53

    Rooster53 Well-Known Member Premium Member

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    A few more specifics would help. Is it all the plugs? Is it something that suddenly happened or did it occur after some other maintenance?

    The safety circuit can shutdown spark be disabling the TCI, but this will cause no spark on all 4 cylinders. It is easy to temporarily defeat the safety circuit by removing the side stand relay or unplugging the bullet connector with the B/W wire that goes to the TCI.
     
    Rooster53, Jun 8, 2018
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