missing after an hour

Discussion in 'Gas Engines' started by Drew randles, Jul 16, 2006.

  1. Drew randles
    Joined: Jul 2006
    Posts: 3
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: menorca spain

    Drew randles New Member

    I have a jeanneau 650 leader with the cobra 4.3 V6 engine, the boat is a 93 model so I assume the age of the engine is about the same.
    When I run the boat from cold she runs like a dream but after about half an hour she starts to miss fire almost as if one or two of the cylinders shut down.
    Has anyone had this same problem or could suggest what it might be ?
    any suggestions would be much appretiated
  2. gonzo
    Joined: Aug 2002
    Posts: 13,609
    Likes: 382, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    How do the sparkplugs look like? Reading them will tell you a lot of how the engine is running and if the fuel/air ratio is correct.
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