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  1. #1
    RonJon's Avatar
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    15F Cant Idle... TPS??

    Ok guys so for the past few weeks my engine has almost stalled when I let off the throttle suddenly from high rpm. Then after a few outings it got worse and would sometimes stall when suddenly letting off throttle at high rpm.

    Well yesterday it effectively lost its ability to idle without me squeezing the throttle just a tiny bit. Every time I let off the throttle it shuts off. If I hold the throttle just a tiny tiny bit, it will idle just fine at the usual idle rpm... But let off and it stalls...

    It starts up just fine every time after it stalls. Compression it good. RPMs are good (3 bars past 7K). Acceleration is insane. It's almost like my idle adjustment bolt on the throttle body was turned out too much but I checked and it looks fine.

    So what are your guys thoughts? Has this happend to anyone before?
    Throttle Position Sensor maybe???

    Thanks for any help...
    941-716-1306

    2008 15F
    180 hours


  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    check the idle control motor on top of the throttle body, it that isnt opening and closing then thats your problem

    Sean

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    +1 Im with Sean on that one. OR Just maybe!!!! the cable is out of adjustment.. that is if the IAC checks good

  4. #4
    nicjak's Avatar
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    wasnt there a recall on the 15f throttle body

  5. #5
    RonJon's Avatar
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    Is there an easy way to check the idle control motor?

    And whats this about a recall?

  6. #6
    Moderator #985 lasportsmn's Avatar
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    Mine has been doing it for about a while now. I just have learned to pretty much just hold a little throttle when coming down fron a higher RPM. I did notice that when this started the smart steer quit working. It idles fine and also if I am at idle and just hit the throttle hard to clear the exhaust it won't die but as he said WOT to just letting off, yep it will die. I just learned to deal with it when the dealership said nothing was wrond twice.

  7. #7
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by RonJon View Post
    Ok guys so for the past few weeks my engine has almost stalled when I let off the throttle suddenly from high rpm. Then after a few outings it got worse and would sometimes stall when suddenly letting off throttle at high rpm.

    Well yesterday it effectively lost its ability to idle without me squeezing the throttle just a tiny bit. Every time I let off the throttle it shuts off. If I hold the throttle just a tiny tiny bit, it will idle just fine at the usual idle rpm... But let off and it stalls...

    It starts up just fine every time after it stalls. Compression it good. RPMs are good (3 bars past 7K). Acceleration is insane. It's almost like my idle adjustment bolt on the throttle body was turned out too much but I checked and it looks fine.

    So what are your guys thoughts? Has this happend to anyone before?
    Throttle Position Sensor maybe???

    Thanks for any help...
    941-716-1306

    2008 15F
    180 hours
    confirm your base idle screw on the TBody hasn't back off/worn a mark in the cable holder bit.
    imagine its been getting slammed shut for the llast 180hr, thing change shape abit


    as the system requires a certian amount of mechanical idle speed , it doesnt rely fully on the IAC

    best way is to check that TPS voltages are as per manual specs
    at OEM rpm settings, if the voltage is low good chance it need bumping up

    also ensure your TB is clean, remove inlet hose and if it is all black and gunked up byuy some TB clean and also clean IAC circuit if required
    at 180hr could be a good start point, as older engine breath more.
    Waz

  8. #8

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    Quote Originally Posted by sirbreaksalot View Post
    confirm your base idle screw on the TBody hasn't back off/worn a mark in the cable holder bit.
    imagine its been getting slammed shut for the llast 180hr, thing change shape abit


    as the system requires a certian amount of mechanical idle speed , it doesnt rely fully on the IAC

    best way is to check that TPS voltages are as per manual specs
    at OEM rpm settings, if the voltage is low good chance it need bumping up

    also ensure your TB is clean, remove inlet hose and if it is all black and gunked up byuy some TB clean and also clean IAC circuit if required
    at 180hr could be a good start point, as older engine breath more.
    Waz
    DO NOT SPRAY ANYTHING IN THE IDLE AIR CONTROLER,YOU WILL BE REPLACING IT IF YOU DO!!!!!!!!!!!!!! Take it into the dealer, i suppose the smart steer could have a problem too.

  9. #9
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by STX-15FER View Post
    DO NOT SPRAY ANYTHING IN THE IDLE AIR CONTROLER,YOU WILL BE REPLACING IT IF YOU DO!!!!!!!!!!!!!! Take it into the dealer, i suppose the smart steer could have a problem too.
    Been spraying X55 solvents in IAC circuts for the last 20 years on cars,bikes,kawasaki skiies etc.
    Long before wet bikes even thought about EFI system's
    But hey what would I know.

    Smart steering holds the IAC open not shut, so don't see it causing a stall issue

  10. #10

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    Quote Originally Posted by sirbreaksalot View Post
    Been spraying X55 solvents in IAC circuts for the last 20 years on cars,bikes,kawasaki skiies etc.
    Long before wet bikes even thought about EFI system's
    But hey what would I know.

    Smart steering holds the IAC open not shut, so don't see it causing a stall issue
    Well some folks have more luck than most is all i can say.

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