Back fire on fuel injected HD's

Discussion in 'Other Service and Maintenance' started by BigG, Jul 23, 2009.

  1. BigG

    BigG Active Member

    159
    26
    0
    I have a 2003 FLSTCI which is obviously fuel injected. I have a back fire or cough occasionally when I goose the throttle. Any suggestions as to what could be causing it to backfire or cough?
     
  2. R. Lewis

    R. Lewis Senior Member Retired Moderators

    2,183
    48
    5
    Any mods done lately to it? Is this only when you excel or is it also decel?
     
  3. BigG

    BigG Active Member

    159
    26
    0
    No I had the Stage 1 Kit at 500 Miles in Feb 03. Now has 30,000 miles with no additional performance related changes.
     
  4. 03classic

    03classic Junior Member

    424
    26
    0
    When is thre last time you ran some injector cleaner through it?
     
  5. glider

    glider Veteran Member

    25,464
    108
    44
    Fuel injection shouldn't cough back unless there's something causing it to lean out like an intake leak or modifications to lean it out like intake etc.
     
  6. BigG

    BigG Active Member

    159
    26
    0
    What is the best injector cleaner to use?
     
  7. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

    4,630
    68
    99
    I put 2 oz. of Marvels Mystery Oil in every tank fill-up (formula is 4 oz./10 gallons of gas). Cleans and lubricates the fuel system and stuff that only the gasoline gets to.

    On the coughing/backfiring, follow Glider's lead here and look for intake/exhaust leaks. Info on this is in the Self-help pages in the appropriate section:

    Self Help Information and Tips - Harley Davidson Community

    TQ
     
    Last edited: Jul 24, 2009
  8. tommytommi

    tommytommi Member

    15
    1
    0
    Could it possibly be a loose battery connection?