Recent content by tluns

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    Bad sensor?

    .
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    Bad sensor?

    I have now experienced the following twice almost exactly the same to the minute. 2011 5.7 horizon MPI inboard, 135hrs. Runs perfect for approximately 1hr cruising about 2100rpm. At the 1hr mark the guardian kicks in and the alarm goes off steady. I take the throttle down to idle and pop it out...
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    Mercruiser 350 mag MIE ECM

    That’s sort of what I was thinking. The only real difference I see is the pickup isn’t off the distributor but off the ECM via the crank position sensor I would assume.
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    Mercruiser 350 mag MIE ECM

    Update: ECM on its way back. No issues.
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    Battery bank bonding

    Yes
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    Battery bank bonding

    Bow thruster is always in water.
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    Mercruiser 350 mag MIE ECM

    How so?
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    Battery bank bonding

    I recently purchased a boat with a bow thruster. It is powered by a completely isolated bank of 2 six volt batteries. No other loads. Do you think I should bond the negative side to the negative side of the bank of house batteries? It seems like if the banks are not bonded at negative there...
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    Mercruiser 350 mag MIE ECM

    How do?
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    Mercruiser 350 mag MIE ECM

    I cant right now. ECM is on its way to San Diego. Yes cap was changed but that wouldn’t matter as there was no spark from coil.
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    Mercruiser 350 mag MIE ECM

    Damn autcorrect! Module, coil, and relays.
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    Mercruiser 350 mag MIE ECM

    Also, when it failed there was no spark at coil or plugs and the diagnostic check showed module, coil, rrr egg lays behaving properly.
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    Mercruiser 350 mag MIE ECM

    Took awhile to get back. It is a 350mag mpi horizon fwc. It is the flat cap distributor. Coil ignition module mounted on a plate next to distributor. The engine is running again. Diagnostics showed no codes and all run tests were sat while it was dead. After it restarted it died once about 10...
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    Mercruiser 350 mag MIE ECM

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    Mercruiser 350 mag MIE ECM

    Boat died today after running for two hours. I was running about 2800 went to throttle down and it just throttled down to dead. Turns over but no spark. Power is good to coil and ignition module. Also swapped out with a known working coil and module. Distributer turns and cap/rotor were ok. A...
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