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    Follow up Mercruiser 4.3L MPI Single Alarm

    All- I posted previously about receiving a single alarm at approximately 2000 rpms on a 2007 Sea Ray Sport 185 4.3 L Fuel Injected engine. Fast forward and I have now replaced practically every mechanical and electrical component for this boat that could potentially cause the alarm (water...
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    Chris Meant module, sorry.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    After tomorrow, thats going to be the case cause he is calling it quits and can't figure it out. Talked to my buddy who said it could be the ignition control valve. Problem is that im 14 hours into work at 125/hour and no solution. I almost want to ask him to check it but if its that im...
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    Hes also not getting any codes with his marine reader.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    @dubs283. I found the connection to the ECM to have it scanned as I hooked up the vessel view to it. I just got off the phone with the boat mechanic and he said that he has never had to do this before but he is tapping out cause he can't solve the issue. He spoke with mercury technicians and...
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    So follow up. Boat being looked at by a mechanic. They’re are “thinking” it’s the rotor because the metal tab was broken. My concern is that there isn’t a plug that attaches that communicates with the ECU. Would this trigger an alarm with no electronic connection?
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    ill give it a go
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    2
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    I also checked the thermostat (and tested it putting it in hot water) and the cap and rotor which all looked great.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    The follow up question I have is, if the water pressure is that low-no code is being thrown-could my circulating water pump be the issue? and it not throwing a code?
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    I also thought the water pressure was low especially with a load. Here's my concern though, clearly the water pressure sender is working as its providing a reading. I checked the impeller and even though its "formed" (which I have a new one and can change), if the pressure was too low or even...
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    Is that what the correct water pressure should be? I checked the impeller the other day and it was perfectly fine.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    It is water pressure.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    I used the info provided to get other readings from the vessel view. I have posted them below. To be honest, I have not researched what normal readings should be, but any input you have please let me know. The last screen shot is right before the boat when into guardian mode.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    So I do have a trim sender and trim limit on my sterndrive. The gauge is not working, would this cause me to go into guardian mode?
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    Wait, I can do that? I read the vessel view manual and what your saying was not in there.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    Yea it’s going to the mechanic next week to have it hooked up to the computer
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    But to go into guardian mode? I’ve had trouble with it once in the past, but didn’t go into guardian mode.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    One other question, which I dont think will cause it to do what it is doing is, I changed the IAC valve, and removed the muffler from within the throttle body (little white piece of sponge, which was black as the ace of spades) and never replaced it.
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    4.3L MPI 2007 Searay Sport 185. Single Alarm at 20 RPMs and higher

    Chris much appreciated with the video. I also thank everyone else who assisted. Just wanted to provide an update. I spoke with my mechanic and decided to change the impeller, but it was in perfect condition and was not the issue. I also used half of a 55 gallon plastic drum to submerge the...
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