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Showing results for tags 'raw water sensor'.
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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).