Kohler 28EFI problems

Discussion in 'Mechanic and Repair' started by cward76, Mar 13, 2006.

  1. cward76

    cward76 LawnSite Member
    Posts: 62

    Just bought a new Z last week 3/9/06. It has the 28hp Kohler EFI on it. After 1.8 of playing around on it the motor all of a sudden started running like it was flooding. I put it up and called my dealer. He came out and took a look at it. When we starter it up it sounded twice as bad as the day before. It was only running on one cylinder. Changed around the coils and plugs and found that the back cylinder had a low compression. He thinks that the fuel injection system maybe the problem. He hoped nothing was wrong internal with the engine.
    Has anyone heard of this happening? Thanks for any info.
  2. cward76

    cward76 LawnSite Member
    Posts: 62

    Anyone Out There
  3. work_it

    work_it LawnSite Senior Member
    Posts: 976

    If you're already having problems with the mower after 1.8 hours you may want to consider having your dealer trade it out for another mower. If you're having problems with the engine now there's a good chance you'll continue having problems the entire time you own it.

    Keep in mind that there's not a manufacturer out there that doesn't eventually produce a lemmon.
  4. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    I've had no problems with mine. Did your dealer run the ECU self diagnostic? I don't quite understand how he can blame the EFI for low compression.
  5. cward76

    cward76 LawnSite Member
    Posts: 62

    My thoughts exactly. Dealer came by last night and picked it up to take it back to the shop. He said that trading it out might be an option if there is no easy fix. Seems if there is a lemon it will always fall in my hands.
  6. cward76

    cward76 LawnSite Member
    Posts: 62

    This is a question I have been meaning to ask someone about. I don't know whether or not he did, but I did check the code and it displayed a 61. From what I understand this mean that no problem was detected. I do not understand how the engine could be running so poorly with the ECU not picking up anything.
  7. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Posts: 11,062

    Well, I for one don't believe compression has anything to do with this.
    Well not compression as we are considering it...

    What I mean is that the dealer probably meant something else.
    I think that unless he literally did a compression test on that cylinder right there.

    Sounds to me like one cylinder just isn't firing for whatever reason.

    Hope your dealer is good with the EFI's though.
    Many of them struggled to fix the carb ones, much less EFI.
  8. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    A 61 does indicate no codes in the Key On Engine Off mode or the Keep Alive Memory. A quick way to test the ignition portion of the EFI while the engine is running is to look at the tach. If it's nice and smooth then that cylinder generally is having no problems. You would then switch the tach wire to the other plug wire and look for the same thing. If both wires have erratic readings then the EFI definately has a problem. If only one cylinder is having an ignition problem you then switch the coils and see if the problem moves to the other cylinder. If it does then it's the coil, if it doesn't it's the EFI.

    If the engine was running rough as soon as you started it then you can also rule out the HEGO (o2) sensor. The EFI only looks at the HEGO sensor after the engine has warmed up.

    You can also check to see if the MIL light was flashing codes when the engine is running.

    Grounds are extremely important in an EFI system. It sounds like one has not been connected properly or has come loose.
  9. thecrankshaft

    thecrankshaft LawnSite Member
    Posts: 172

    What is the serial number of this engine?
  10. puppypaws

    puppypaws LawnSite Fanatic
    Posts: 8,921

    Please let us know what the problem was in detail on your 28 efi.

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