Re: What's Wrong?
Dave could be on to something there, the low oil and hi temp sensors are not the same ones that feed your gauges and you may or may not have the audible alarm in your boat to let you know that one of them is set on. Here is a piece from the manual.
The SLOW operational system is designed to protect the engine from
damage should it lose oil pressure or experience excessively high coolant
temperature. This system will activate automatically without operator action.
The condition can be verified by checking either the oil or temperature
gauges. In the event of a high coolant temperature (200?F and above), or
low oil pressure (less than 5 psi), the coolant temperature switch or the oil
pressure switch will ground a low voltage signal in the ECA. The ECA will
then begin to alter the fuel injector firing sequence, causing the engine to run
rough and eventually bringing the engine speed below 2700 rpm. Once
below 2700 rpm, the engine will run smoothly but be limited to a max of 2700
rpm by the ECA. The engine will remain in this SLOW operational mode until
such a time as the problem is corrected or the temperatureipsi moves back
into the normal range. If the vessel is equipped with an Audible Alarm option,
a warning horn will sound as soon as the engine enters the SLOW mode.
Engine speed limiter operation is controlled by, you guessed it, the ECA.
Sensor operation, such as the rpm data from the PIP signal, is also
monitored by the ECA. If engine speed exceeds the programmed maximum
by 400 rpm, the speed limiter circuit will be activated, effectively halting all
fuel injector firing until the engine speed falls back within the allowable limits.
Once engine speed is back below the limit, the speed limiting circuit will be
de-activated and injector firing will resume.
