kohler 26 hp efi question!

Discussion in 'Mechanic and Repair' started by peddleradv, Oct 23, 2013.

  1. peddleradv

    peddleradv LawnSite Member
    Posts: 6

    Is the throttle valve arm(?) suposed to rest against the idle screw when at idle... Mine is not and i am trying to do an ecu reset and tps procedure... The mower runs great while under load. Its a 2000 Exmark Z. I have just replaced every sensor on the engine because of a "run rich" problem that it has. 1500 hours, compression @180 on both sides and fuel psi at 39-40(new pump and filter). I think I found the service port at the rear of the mower( tiny thing) , but i dont feel that i am doing the tps procedure right because there are no blinking lights when i think im done. Mil has no codes ... Always 61.... Any help would be fantastic
     
  2. ZX12R

    ZX12R LawnSite Senior Member
    Posts: 775

    Mine does not(Walker mower 26 EFI) and the only reason I am aware of it is because I just replaced the throttle cable.

    Not sure if this will help you,but,here's a pdf that contains some issues that early exmark EFI's had.Theres an updated temp sensor kit to keep water from getting into the connector which would corrode terminals sending false signals to the computer keepnig it in open loop.


    http://www.mymowerparts.com/pdf/Kohler-Miscellaneous-Manuals-and-Bulletins/364536868.pdf
     
  3. peddleradv

    peddleradv LawnSite Member
    Posts: 6

    You know.... That could be it! I will give it a try and thank you!!
     
  4. ricky86

    ricky86 LawnSite Bronze Member
    Posts: 1,704

    The throttle shaft must be against the stop and can't be moved during initialization.
     
  5. ZX12R

    ZX12R LawnSite Senior Member
    Posts: 775


    You are welcome,let us know what you find.
     
  6. Jeff in AL

    Jeff in AL LawnSite Senior Member
    from Alabama
    Posts: 718

    Depending on which version of ECU you have will depend on if you need to lock the throttle shaft or not at 1500 RPM.

    On the 32 Pin - MSE 1.1 Bosch ECU you do not need to lock the throttle shaft against the stop screw.

    On the 35 Pin - MA 1.7 Bosch ECU and the 24 Pin MSE 1.0 Bosch ECU, they both require the throttle shaft to be held against the stop screw at 1500 RPM...
     

    Attached Files:

  7. peddleradv

    peddleradv LawnSite Member
    Posts: 6

    It's the metal case ECU and if i close the throttle valve to the piont where it is resting on the set screw it will shut the engine off!
     
  8. Jeff in AL

    Jeff in AL LawnSite Senior Member
    from Alabama
    Posts: 718

    Did you follow the specific steps in order as outlined in the "TPS Initialization" PDF I posted above for your specific ECU?
     
  9. peddleradv

    peddleradv LawnSite Member
    Posts: 6

    I started to today but I was called away. I will try again tomorrow and thanks for your help!
     
  10. peddleradv

    peddleradv LawnSite Member
    Posts: 6

    I can't adjust the idle by the idle screw. Screw is all the way in and i still does not touch the throttle lever... Does that mean something else is out of adjustment?
     

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