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    2002 Mercruiser 350 Mag MPI showing high temp and engaging guardian system

    Thank you for all of the great info, I really appreciate it. We are continuing to troubleshoot, and are going to try one more part, a water pressure sensor to see if that makes a difference. Given that we have had it scanned already and gotten the overheat codes I think the next thing we may...
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    2002 Mercruiser 350 Mag MPI showing high temp and engaging guardian system

    Thank you for the detailed reply. You may be correct that the overheating codes were old codes. The last time I had the engine scanned (400 hours and 5 seasons ago) I vaguely recall there only being 2 legacy overheat codes stored on the ECM. This is also reinforced by the fact that the dash...
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    2002 Mercruiser 350 Mag MPI showing high temp and engaging guardian system

    It is an inboard. My husband has pulled every hose and changed out the impeller, pulled the other water pump and checked and cleaned it. He has also put in a new IAC as well as a new thermometer, throttle position sensor, both temp sensors, oil pressure sender and distributor cap. The only...
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    2002 Mercruiser 350 Mag MPI showing high temp and engaging guardian system

    My husband is going to pull the impeller and check it. Is that what you meant?
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    2002 Mercruiser 350 Mag MPI showing high temp and engaging guardian system

    Hi, we have a 2002 Ski Centurion with the 2002 Mercruiser 350 Mag MPI engine. We have been having a heck of a time with it and need some help. We had troubles with it cutting out at waterski speed and shutting off then engaging the guardian system. So over the winter my husband changed out...
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