2002 Heritage Misfiring _ Please help

Discussion in 'Softail Models' started by Dkinney, Jul 20, 2014.

  1. Dkinney

    Dkinney Member

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    The last time I rode my 2002 Heritage Fuel injected it started missing and backfiring suddenly out of the blue. I made it home (about 10 Miles). It starts up and runs no problem but it skips and backfires. It doesn't make a difference if it is idling or if I give it some throttle. There doesn't seem to be any pattern it runs normally for a couple of minutes and then it backfires and misses a couple of times and then repeats the process. I checked the diagnostics and I get a code 63 (System relay contacts open). That is the only code I get. Would that relay cause it to run like this? Any help or ideas will be appreciated.
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Welcome to The forum
    Harley Davidson Forums look here, run these tests next and report back. If you have high voltage or low output it could set this code
     
  3. Dkinney

    Dkinney Member

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    Would this cause the bike to Backfire and misfire?
     
  4. Dkinney

    Dkinney Member

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    The charging system tests good.
     
  5. dbmg

    dbmg Experienced Member

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    But have you checked that the battery cables and clean and tight on both ends?????? Riding if even the slightest looseness can cause a misfire condition..
     
  6. Jack Klarich

    Jack Klarich Expert Member

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    [​IMG]
    # 8 Crank Sensor is the biggest problem, tho a shorted plug wire (do you have a coil cover) installed? The wires can short out there and cause this problem also
     
  7. Dkinney

    Dkinney Member

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    I did check the battery cables and made sure they were clean, tight and dry. I checked all the wiring on the bike and made sure there are no loose connections etc.
    This afternoon I am going to get a can of WD40 and check the intake for leaks.
    I"m leaning towards bad gas or a dirty gas filter. I just filled the bike with gas 20 miles before this happened. I did try dry gas thinking there may have been water in the gas but that didn't change anything. I also installed new plugs but the old ones looked OK and that didn't change anything.
     
  8. Jeff Klarich

    Jeff Klarich Well-Known Member Contributor

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    Try running some seafoam through it as well.
     
  9. Dkinney

    Dkinney Member

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    Where do I get Seafoam? Auto parts store? Or is it specifically for bikes?
     
  10. Jeff Klarich

    Jeff Klarich Well-Known Member Contributor

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    Auto parts stores, wal-mart has it too. Very good gas treatment and is used by many here on the forum.