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    Guardian mode activation with no explanation from gauge

    Update for my fellow boaters. Turns out my troubleshooting and research was wrong (yet again). Was able to take boat into Merc authorized marina thankfully on short notice couple days ago. He called today, said stbd side exhaust gas running hotter at higher rpms than port side, suspects...
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    Guardian mode activation with no explanation from gauge

    So I figured out what’s happening is, guardian mode is activating because the boat is falsely sensing an overspeed condition and the engine speed limiter is kicking in, the engine throttles back and I can hear the 2 cylinders tump. I confused this with bad fuel flow or bad spark. (See attached...
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    Guardian mode activation with no explanation from gauge

    Y Yes smartcraft. Well, mech with code reader is stopping by this week. I’m grabbing at straws.
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    350 Mag MPI chugging at higher rpms

    Now I’m thinking guardian mode is kicking in because of another reason, TRIM POSITION.. I’m gonna check both trim limit switch and trim position indicator switch, I read they can get corroded. Makes sense, chart says HI or LOW limit/continuity will enable Guardian CONSTANT horn. Worth a shot...
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    Guardian mode activation with no explanation from gauge

    I think I may have stumbled upon something. While cycling through my LCD guage display, TRIM POSITION...Bad trim position sensors??? That would also throw on a constant guardian horn. Watched video on youtube that explains before trying expensive replacement, pull off trim position sensor cap...
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    350 Mag MPI chugging at higher rpms

    Ill have to check on ECM or PCM. So, check the ground Gray to B-21. I have a guy coming with scanner. Thanks for replies.
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    350 Mag MPI chugging at higher rpms

    I’ve swapped THREE sending units, all read high. My gauge cycles between different sensors when selection buttons are pressed. I can read block press, trim, water temp, block temp, mpg, hrs, volts, etc all through my rpm gauge display. So, I’m not sure it’s a gauge issue.
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    Guardian mode activation with no explanation from gauge

    Hello, Apologize moderators, I started another thread on my issue as my reason for posting/title changed after further troubleshooting. 350merc B3, on 2013 Monterey 244fs, only 150 hrs, well maintained. My question is, and it should be pretty simple to find an answer, guardian mode kicks in...
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    350 Mag MPI chugging at higher rpms

    So, whats the flow of information for water pressure? Sensor sends info directly to gauge or through another part? Does the guardian mode read directly off pressure sensor or gauge? Is a faulty gauge kicking guardian mode on? Because sounds like next step is swap gauge itself.
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    350 Mag MPI chugging at higher rpms

    No, I’m having a mechanic come take a look and run codes. I read on other sites, that hit pressure may be restriction downstream of pump. So, I’m gonna pull tstat housing and look in there next.
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    350 Mag MPI chugging at higher rpms

    Swapped three water pressure sensors in/out, same reading.
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    Mercruiser 6.2 showing high water pressure

    I’m having similar issue with my Monterey 244FS, 350 Merc. I am showing 20-40 block pressure psi at idle and 110-140 at cruise all of a sudden. Temp and oil pressure is fine. No overheating, accelerates fine, no misfires. Guardian mode keeps kicking in. Changed impeller and poppet valve last...
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    350 Mag MPI chugging at higher rpms

    Here’s a pic of my IDLE block pressure.....
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    350 Mag MPI chugging at higher rpms

    Also, what’s the normal running oil pressure range for these motors, up on a plane, I’m getting close to 70 psi, gauge maxes out at 80. 70 seems high...checked oil level, normal range.
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    350 Mag MPI chugging at higher rpms

    Update. I checked fuel filter, cleaned flame arrestor, all fine. Turns out I think the chugging I get is the guardian mode kicking in and pulling back motor. So, it runs fine, accelerates fine, then guardian mode kick in and doesn’t give me a reason why on screen. Various rpms it kicks in...
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    350 Mag MPI chugging at higher rpms

    Thanks for replies. New filter ordered, checking what comes out of existing one this week. l'll inspect pressure sensor, just replaced it less than 30 hours ago...
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    350 Mag MPI chugging at higher rpms

    Hello (again), 2013 Monterrey 244FS with 350 Merc BIII. Has 155 hrs, 100 hr service done last year. Stored on lift in Jax, FL. Fuel stabilzer added before our mild winter and ran a few times during that time. Took her out yesterday, started up fine, ran fine for about 30 mins. Then she’d start...
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    350 Mag block pressure?

    Hello all, I have a 2013 Monterey 244FS, 350 mag, bravo 3. Only 140 hrs. Had Low Block pressure and guardian activated. Setvice engine soon. Changed pressure sensor, still happend. Pulled pump, needed impeller change. Ran it today, still get service engine soon, and it will run fine great...
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