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Ignition problem

Discussion in 'Motorcycle Tech Talk' started by 02Switchblade, Sep 15, 2009.

  1. 02Switchblade

    02Switchblade New Member

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    I have a 2002 FXDWG3, that is mostly stock. Sometimes I lose spark at the rear cylinder, and to get spark I have to pull the wire off at the plug or the coil and then attach leaving about a eighth of an inch gap. I have checked both the coil an the wire an both checked good according to the service manual. Anybody got any Ideas?
    02Switchblade, Sep 15, 2009
    #1
  3. cowboy

    cowboy Moderator Staff Member

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    make sure both ends are clean & with key off use a small wire brush to clean inside the coil , might be just a build up in there kinda like a battery gets & you have to clean them every once in a while
    cowboy, Sep 15, 2009
    #2
  4. hotroadking

    hotroadking Super Moderator Staff Member

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    do you have chrome spark plug covers>?

    They have rubber boots below the chrome to keep the covers
    from grounding. If they slip, get a cut, etc then the plug can arc outside the cyl
    and it will missfire

    Other cause can be a cut plug wire, you might have a slit in the wire and when you pull the wire back up it's closing the gap, inspect the wire from tip to tail...

    Might consider replacing wires and i'd just use stock HD stuff, especially if you have the Delphi EFI as it has an ion sensor in the ecm and if you use the wrong plugs, wires etc it can toss off codes and cause issues.
    hotroadking, Sep 15, 2009
    #3
  5. chucktx

    chucktx Moderator Staff Member

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    change the plug. you are"short firing" the plug. when a plug fouls you can sometimes get it to fire by short firing it. i have come home with this method on my pan when i fouled a plug and didnt have access to another one..........hope this helps
    chucktx, Sep 15, 2009
    #4

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