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  • Help needed

    hi guys,

    im new here and new to boating. I just bought a used boat with a 2008 Yamaha F90tlr on it, motor start right up and stay idle but if I try to trim up or down engine will kill and can't start again, engine alarm goes off after each time I tried to start. If I try to start it after 15-20mins it will start right up and if I try to trim it will kill again.
    The guy I bought the motor from told me that the engine was running good with no issues, only thing he recommended was changing the lower unit oil since he didn't have a chance to get it done.
    these are things that I did to the motor after purchase:
    -oil change
    -new spark plugs
    -fuel filter
    -lower unit oil change
    ​​​​​​-adding a water separate between the fuel tank and engine
    -adding a different type of kill switch
    can you guys give me any suggestions where and what to look for? Any help are greatly appreciate.

    ****the fuel bulb will get firm after few pumps but as soon as I stop it will soft again.

  • #2
    kill switch activated while turning over motor should sound the alarm.

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    • #3
      Engine dying when the trim motor runs is a bad battery / ground connection I believe

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      • #4
        Thanks, I'm gonna give it a try.

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        • #5
          lets see.
          the ECU needs 12 v.
          the ign system needs 12v.
          the fuel pump needs 12v.
          the injectors need 12v.
          when you hit the trim something gets lost.
          myself I would do a voltage drop test on the battery cables.

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