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Found 1 result

  1. Colic

    possible causes guardian mode

    My 2004 6.2 MPI fresh water cooled Mercruiser runs just fine up to 4200rpm (which it struggles to get to), at which point it shuts down to idle speed with a constant warning buzzer. Once the throttle is returned to neutral all is well again, until 4200rpm. Im thinking there can only be a few causes of these particular symptoms, or alternately the more common causes, and if so some specific test or new sensors I could try for a quick fix. Can the raw water pressure sensor cause this? Im not sure why it wouldnt warn at lower rpm, unless it only fails at higher pressures. I do know they commonly fail or get clogged up, so Im thinking it may be worth investigating if it can cause these symptoms. I should also note the sterndrive oil was at (but not below) the "ADD" mark, but I dont see this as a potential cause (but mention it because if I knew what was I wouldnt be posting!). thanks for any help/advice (PSI know the real answer is to get a scan tool or pay for diagnostics. Ill do that if I cant take an educated guess here).