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  1. #1
    Doo It Till It Hurts! holdnon72's Avatar
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    Flutter sound on start-up?

    Opened up the 2006 sportster 155hp 4-tec this season and noticed a weird sound on start-up. A short flutter sound only on start-up then it disapears. I put key in here fuel pump prime,hit start button rite after engine starts a short flutter sound then disappears. Any idea what it could be? Thanks


  2. #2
    AtoMIC_OraNGE greenbullet's Avatar
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    Leaky injector ?
    As soon as it fires that's unburnt fuel In the cylinder if so that is igniting until the duty cycle fires when it starts
    just a thought
    I had this before on my modify ski from running to rich at idle
    OR a bad coil possibly

  3. #3
    Doo It Till It Hurts! holdnon72's Avatar
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    Thanks man...im on it! I did the plugs tonight made sure my fuel rail was seated properly...
    im bringing home my coil gun tester tomorrow from work to see if all 3 coils are firing strong.
    My Spark-plugs seemed a hair on the loose side when removing. Im always so afraid of over tightening them,probably didnt torque then enough lest season. Also gonna drain gas and start fresh. Ill let you know if the flutter goes away.
    injectors seem fine No leaks

  4. #4
    Doo It Till It Hurts! holdnon72's Avatar
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    Ok coils are all firing strong! Put fresh fuel in...flutter sound on first start up but then started to disappear after a couple more starts. Greenbullet when you say leaky fuel injector i see none of them leaking at all. Do you mean leaking on the outside?

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