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2005 5.7 gx-f stumbles @ 900-1100 RPMS

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  • 2005 5.7 gx-f stumbles @ 900-1100 RPMS

    hey GUys i need some help, i have a 2005 gx that was running poorly and intermitently no start. the fuel pump terminals were all corroded and the pump was not working properly so that was replaced, then it would run fine but not great.and developed a stumble @ 900 through 1100RPMS. then it would smooth out. the whole boat would shake. the cap was corroded so the cap/rotor and plugs were replaced. with no change. then it stopped running entirely. diagnostics found that the coil output was very weak so the coil and wires were replaced. the boat now runs but the same stumble is still there.
    i have verified the low and high fuel pressure, the spark is fine. the injectors are firing properly and i did a fuel injection cleaning on them. i did a cylinder balace test using the rinda scanner and all cylinders seem to react the same.
    im stumped on this one.
    any help is always appreciated

  • #2
    verified the low and high fuel pressure, the spark is fine
    Does the fuel pressure stay steray as it goes thru the rpm band?

    Connect the scanner and watch the TPS to see if you get a smooth increase as the throttle moves. Then watch the MAP and IAC and compair with TPS operation

    TPS % goes up, MAP pressure goes down, IAC % or count corresponds to transition between 900 and 1100 rpm
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

    Comment


    • #3
      i was reviewing the tp sensor voltage and although it is smooth, and does not drop out during acceleratipon, i think it stays at .72v a bit longer than i feel it should as in, i am moving the throttle ever so slightly and the rpms increase slightly but the tps volts hold @ .72, then continues, .74,.76 etc...

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      • #4
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        It should continue to move, and can be marked as an issue to watch and compare with the other readings
        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 Seadoo GTX
        Merc Adults Only VP Adults Only
        G-Dad always said "First Liar doesn't stand a chance"

        Comment

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