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1999 1750 Bayliner Capri Deiseling? (3.0 Merc)

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  • 1999 1750 Bayliner Capri Deiseling? (3.0 Merc)

    I purchased this boat in 2002 and this boat has always dieseled. This mainly happens after shutting down after running a long distance. Boat has been very well maintained and always good gas. New plugs evey year and recently new wires. Timing Maybe??


  • #2
    Re: 1999 1750 Bayliner Capri Deiseling? (3.0 Merc)

    Let it idle a minute before shutting it down. Do you have good air flow through the engine compartment? You may try leaving your blower on (if you're currently shutting it off while cruising)

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    • #3
      Re: 1999 1750 Bayliner Capri Deiseling? (3.0 Merc)

      As Marunr said..... Let it idle before shutting it down. At least 30 seconds.

      This is a common problem with this engine that is solved by idling a bit before shutting off.

      No need to worry, this is a great engine and if maintained will last many years.

      Have a 1996 3.0 LX and put about 125 - 150 hours on a year.

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      • #4
        Re: 1999 1750 Bayliner Capri Deiseling? (3.0 Merc)

        I have 99 Capri with the 5.0L, and has just seems to started doing it this season. I believe still original plugs, on my list to replace those soon. Yes, letting it idle a little first does help. Will also try turning on the blower first. Wonder why just recently started? Different gas mixes?

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        • #5
          Re: 1999 1750 Bayliner Capri Deiseling? (3.0 Merc)

          I have a 175 with the 3.0 and noticed that whenever I run regular or a lower octane fuel the same thing happens. After cruising to a stop I can put it in nuetral and rap it off once and it does not deisel or let it idle for a bit.
          The best way to reduce this is just use premium fuel or an octane booster additive.

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          • #6
            Re: 1999 1750 Bayliner Capri Deiseling? (3.0 Merc)

            I tried and worked thanks guys.

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