STX 15F Starting Problem when hot
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  1. #1
    PWCToday Newbie
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    STX 15F Starting Problem when hot

    Here is a problem I am having with my
    Kawasaki STX 15F I just bought this Ski
    so I do not have much history to add.
    The ski was started 3-4 times when the engine is cold
    Runs 45min- 75 Minutes solid 35mph --50 mph
    Perfect not even a hiccup
    This has happened the last two times it went in the water
    Come back to shore .....turn off will not start
    Put back on the trailer take home 45 minutes later started.
    Stop switch has been ruled out / Battery is new with full charge
    Last edited by piramid; 07-21-2010 at 06:12 AM.

  2. #2
    Top Dog kawiski's Avatar
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    Re: STX 15F Starting Problem when hot

    Quote Originally Posted by piramid View Post
    This has happened the last two times it went in the water
    Come back to shore .....turn off will not start
    Questions:
    1. When you came back to shore, just before turning off the engine, were you idling or riding slow for any extended period of time say like 5 minutes or longer such as in no wake zone?
    2. While cranking the engine, trying to start, did the engine ever have a hard time turning over like something was trying stop it from rotating like hydrolocking feeling?
    3. Finally after starting the engine, did it idle/run good from the get-go or was it misfiring for first few minutes?

    Things to check/do:
    1. When the engine fails to restart immediately next time, pull out eacg plug and inspect the electrode for any moisture.
    2. Check the resistance (ohm) reading of the air temp & water temp sensor.

    Report back what you find.

  3. #3
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    Re: STX 15F Starting Problem when hot

    Quote Originally Posted by kawiski View Post
    Questions:
    1. When you came back to shore, just before turning off the engine, were you idling or riding slow for any extended period of time say like 5 minutes or longer such as in no wake zone?
    2. While cranking the engine, trying to start, did the engine ever have a hard time turning over like something was trying stop it from rotating like hydrolocking feeling?
    3. Finally after starting the engine, did it idle/run good from the get-go or was it misfiring for first few minutes?

    Things to check/do:
    1. When the engine fails to restart immediately next time, pull out eacg plug and inspect the electrode for any moisture.
    2. Check the resistance (ohm) reading of the air temp & water temp sensor.

    Report back what you find.
    Answers to Questions
    1. Yes
    2. No
    3 just maybe 5 seconds

    Where is the air temp & water sensor??

  4. #4
    Top Dog kawiski's Avatar
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    Re: STX 15F Starting Problem when hot

    Air Temp Sensor - Just below TPS at the rear bottom of the intake manifold.
    Water Temp Sensor - On top of exh manifold.

  5. #5
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    Re: STX 15F Starting Problem when hot

    I think I found The air temp sensor it has 2 wires
    Red/Blu with Bl Stripe
    Blk/White witht Brwn Stripe
    This goes to a Blue 2 wire connector
    but the other side of this connector goes to the front of the engine Maybe oil pan
    Are there 2 air sensors on this thing ?
    Am I in the right place??

    Sorry a little confused

  6. #6
    Top Dog kawiski's Avatar
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    Re: STX 15F Starting Problem when hot

    Quote Originally Posted by piramid View Post
    I think I found The air temp sensor it has 2 wires
    Red/Blu with Bl Stripe
    Blk/White witht Brwn Stripe
    Are there 2 air sensors on this thing ?
    You are almost right. The Air Temp Sensor has the Red/Blue and Blk/Wht wires (not Brn). Just disconeect the blue connector that and measure the ohm reading of the sensor side at room temp. BTW, the Red/Blue wire goes to ECU and the Blk/Wht wire goes to the 8-pin joint connector.

    No, there is only one ATS. The other one on the top of the int manifold is the APS (pressure). The one on front/bottom of oil pan is the OTS (oil temp). FYI.


    Do the same on the water temp.

  7. #7
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    Re: STX 15F Starting Problem when hot

    Should I test these wires when the ski will not start and while it is still hot?

  8. #8
    Top Dog kawiski's Avatar
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    Re: STX 15F Starting Problem when hot

    It would be best if you do the ohm check when ambient air temp inside the engine compartment is around 70F.

  9. #9
    PWCToday Newbie
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    Re: STX 15F Starting Problem when hot

    Quote Originally Posted by kawiski View Post
    You are almost right. The Air Temp Sensor has the Red/Blue and Blk/Wht wires (not Brn). Just disconeect the blue connector that and measure the ohm reading of the sensor side at room temp. BTW, the Red/Blue wire goes to ECU and the Blk/Wht wire goes to the 8-pin joint connector.

    No, there is only one ATS. The other one on the top of the int manifold is the APS (pressure). The one on front/bottom of oil pan is the OTS (oil temp). FYI.


    Do the same on the water temp.
    OK
    It seems like the ats wires do not terminate anywhere but the Main connector
    One of the wires seems to look almost red /prpl more than red /blu
    is that possible?
    The blue connector went only to the front sensor

  10. #10
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    Re: STX 15F Starting Problem when hot

    The water temp sensor reads nothing

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