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  1. #1
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    May 2007
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    Low RPM, Vibration

    I have a 2001 Islandia, 240 Merc EFI. The RPM's won't go above 4900-5000 RPM's. I did a compression check and all were around 130 psi. Next, I would like to verify all cylinders are firing. What's the easiest way to do this? If 1 or more aren't running, how do I tell which ones? Any other ideas or suggestions regarding this problem are appreciated.
    Also at idle to about 1500 RPM's the engine is extremely rough. Very shaky like a cam with a lot of overlap in a car. So if all the cylinders are firing, maybe something else is off balance like a bad impeller? Would this also slow the engine and boat down?
    Thanks,
    James

  2. #2
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    Aug 2004
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    Hillsboro MO
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    Most likely not an impeller or pump issue. I'd focus on an eng malfunction. Post your question in the Tech forum..Good luck!

  3. #3
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    May 2007
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    Thanks for your reply. I posted in the Tech forum also.

    James

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