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29HP LC EFI Kawasaki loping idle problem

Discussion in 'Lawn Mowing' started by bpfaeh, Apr 27, 2009.

  1. bpfaeh

    bpfaeh LawnSite Member
    Messages: 49

    I have a 2007 JD 797 with the fuel injected, liquid cooled Kawasaki....under load, no problems at all....when blades not engaged, the engine lopes up and down, up and down....doesnt matter what throttle position. Doesn't die, but lopes all over the place....I did a search and came up with a bunch of carburated stuff, but no fuel injected. Anyone else ever have this problem? Its still under warranty, but I dont think very highly of too many dealerships....any help is appreciated. Thanks
  2. tacoma200

    tacoma200 LawnSite Fanatic
    Messages: 5,426

    They say the engine is easy to hook up and diagnose. Run by the dealer.
  3. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Yeah but never on a mower, only on a car and only at idle...

    And it could be a number of things, in no particular order I'll list them:
    1. The HI-LO screw needs adjusting.
    2. Vacuum Leak.
    3. A missing or broken spring.
    4. Clogged or dirty fuel filter.
    5. Clogged or dirty air filter.
    6. Bad spark plug(s).
    7. The idle air control unit is dirty or bad.
    8. Fuel pump worn out.
    9. Fuel leak.
  4. bpfaeh

    bpfaeh LawnSite Member
    Messages: 49

    Yeah, I changed the spark plugs, fuel filter, and air filter with no luck. No fuel leaks anywhere...very clean machine. I looked for anything broken or whatnot on the engine but couldnt find anything. I guess I may have to bite the bullet and take to dealer....its under warranty, but I just dont want those $10/hr guys in the shop jacking with my mower that they dont care about and dont really know what they are doing. Not to mention the down time!
  5. Allens LawnCare

    Allens LawnCare LawnSite Senior Member
    Messages: 926

    When was the last time you had the Carb cleaned....this new gas, kills the carbs
  6. bpfaeh

    bpfaeh LawnSite Member
    Messages: 49

    Its fuel injected....

    Anyone else?
  7. Lex Lawn

    Lex Lawn LawnSite Member
    Messages: 66

    Sounds like you may have moisture in the fuel tanks. I would put a little HEAT in there and either drain the tanks and refill with a higher octane or just top it off with gas purchsed from a different gas station. I got a few gallons of gas that were bad and it totally ruined one of my push mowers.

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