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Thread: Low RPM, Vibration
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07-07-2007, 09:55 PM #1Junior Member
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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
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07-08-2007, 09:00 AM #2Member
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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!
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07-08-2007, 12:40 PM #3Junior Member
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Thanks for your reply. I posted in the Tech forum also.
James