02 Walker 26 EFI

Discussion in 'Mechanic and Repair' started by Tomt, Nov 3, 2012.

  1. Tomt

    Tomt LawnSite Member
    Posts: 212

    Was running fine and just started loading up/running rich (black smoke). Removed air filter to make sure not plugged, no change, checked plugs, sooty but otherwise in spec and look fine. My next step was to clean O2 sensor.
    Professional thoughts appreciated, others accepted too, lol.
    Thanks in advance.
     
  2. Tomt

    Tomt LawnSite Member
    Posts: 212

    No ideas? the mower only has 450 hrs, and is well maintained. I only use in fall and winter, as in I need to be using it now. Any suggestions as to next step, much appreciated.:dizzy:
     
  3. MOW ED

    MOW ED LawnSite Fanatic
    Posts: 5,028

    There is a little return spring on the linkage on the top of the motor. It is a very fine diameter spring and I broke one last year with similar results. Check that out. Do you know how to get the codes off the yellow light? You may also see if there is an engine code that you can trace.

    Go to this thread and read up on the codes.

    http://www.lawnsite.com/showthread.php?t=389620&highlight=engine+codes


    Good Luck
     
  4. Tomt

    Tomt LawnSite Member
    Posts: 212

    Mow Ed, no and thanks for the helpful info
     
  5. Curtis

    Curtis LawnSite Member
    Posts: 162

    I had a problem with my 26efi last month,fouling out the plugs running rich never seem to break out of that warm up stage. Never got any bad codes always a 61. Called Kohler and they said it was a oil temp sensor near the oil filter and another ground wire with two new bolts on the starter in a kit. Had it replaced and runs good so far. Leaves are definitly here.
     
  6. Tomt

    Tomt LawnSite Member
    Posts: 212

    Ran the test and code 34 came up.
     
  7. MOW ED

    MOW ED LawnSite Fanatic
    Posts: 5,028

    That looks like an O2 sensor problem. I have to run now but if you need me to expand I will be back on either later or tomorrow. Take care
     
  8. Jet Mech

    Jet Mech LawnSite Member
    from Indy
    Posts: 27

    Take your O2 sensor out of the muffler and clean the carbon off the sensor tip. This can be done with a propane torch. Be careful while doing this, just get the sensor tip to glow red hot long enough to bun off the carbon deposits. Allow it to cool off and reinstall the sensor.

    The ECM will now be able to get the necessary input from the O2 sensor and adjust accordingly after allowing the motor to warm up for awhile. Good Luck.
     
  9. chuacro

    chuacro LawnSite Senior Member
    Posts: 597

    My 2006 started blowing smoke and I found gas in the oil. I replaced the fuel pump and solved the problem.
     
  10. Lawdog302

    Lawdog302 LawnSite Member
    Posts: 197

    Did you get this fixed? those years had problems with the ground wire running to the starter bolt. it was stainless steel instead of tinned copper. It will send mixed readings to the computer if it has never been changed. something to look at possibly.
     

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