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  1. #1

    Default Chrysler LM318 Runs Rough after Restart

    Hi Guys,

    I have a Chrysler LM318 that starts and runs fine for the first hour or so and then runs rough following a restart after a short stop.

    Oil level, spark plug leads and plugs are OK and I can't see any water or contaminates in the fuel filter sight glass.

    So I'm at a loss to understand why it runs ok and then doesn't after a short stop.

    Any advice you can give would be appreciated.

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    8,349

    Default Re: Chrysler LM318 Runs Rough after Restart

    after restart, does the roughness dissipate after a period of time?

  3. #3

    Default Re: Chrysler LM318 Runs Rough after Restart

    Hi makomark,

    Thanks for your response.

    No, it just stays constantly running rough, it feels like it's just not firing on all cylinders. At idle it's on the verge of stalling and has to be watched very closely.

    Note that the ignition is an upgraded electronic ignition system so I hadn't anticipated that it could be the source of the problem.

  4. #4
    Join Date
    Jun 2008
    Location
    Island Heights, NJ,
    Posts
    3,388

    Default Re: Chrysler LM318 Runs Rough after Restart

    Sticky carb float, leaky carb float needle... engine running extra rich ??? Ethanol wreaks havoc with "pre ethanol" neoprene carb needle tips.
    Capt Bob
    1969 23ft ChrisCraft Lancer
    Merc 5.7L 260HP/ Volvo 280

  5. #5

    Default Re: Chrysler LM318 Runs Rough after Restart

    Hi sandkicker,

    Thanks, looking back through the maintenance log, the carb was last overhauled in March 18 so could be worth a check. We generally get 95 Ron fuel at marinas in Sydney so I don't think it contains any ethanol.

  6. #6
    Join Date
    Jun 2008
    Location
    Island Heights, NJ,
    Posts
    3,388

    Default Re: Chrysler LM318 Runs Rough after Restart

    Quote Originally Posted by BRF View Post
    Hi sandkicker,

    Thanks, looking back through the maintenance log, the carb was last overhauled in March 18 so could be worth a check. We generally get 95 Ron fuel at marinas in Sydney so I don't think it contains any ethanol.
    .... and sometimes the floats develop leaks and sink..
    Capt Bob
    1969 23ft ChrisCraft Lancer
    Merc 5.7L 260HP/ Volvo 280

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