The motor runs down

[alex_52]

Good afternoon , help with a problem . On my boat installed PCM 5,7 2003 . After starting the engine after 20 minutes, the check warning lamp lights up and the engine speed drops . If you turn off the engine and wait 10-15 minutes then it works fine for some time about 20 minutes . Advise that can be done in this situation .

[SilentSeven]

How are your engine temperatures during this time?

[alex_52]

How are your engine temperatures during this time?

The motor temperature is approximately 160 , alarm for high temperature is not.

[alex_52]

blinking red light "PRM REDUCIN SEE DEALER"

[SilentSeven]

I'm not familiar with that error. Hopefully someone else can help you.....

[mpost]

I believe he meant to type RPM for the message. I found the following information in the 03 216 manual, PCM manual, and PCM parts manual for the same year in the Manuals/brochures link near the top of the forums page.
It sounds like the boat is going into Power reduction mode.
Is there only one message showing on the display? If your engine temp and oil pressure are showing good on the gauges you may have a bad oil pressure switch or temp switch. These do not run the gauge but tell the computer if the temp or pressure is bad. There are many posts about this.

[alex_52]

Mpost , thanks . I understand the boat has two temperature sensors . The first sensor is connected to the ECM engine control unit and the second is connected to the temperature indicator dashboard . The readings of these two sensors may differ . right ? Forgive me for my English .

[alex_52]

mpost , thanks . I understand the boat has two temperature sensors . The first sensor is connected to the ECM engine control unit and the second is connected to the temperature indicator dashboard . The readings of these two sensors may differ . right ? Forgive me for my English .

[mpost]

Yes there are two. One for the gauge and one for the ECM to monitor. If you remove the wire for the sensor for the ECM the temp gauge will still work and you can try running the boat that way to determine if that is the sensor causing the problem. You can also do this with the oil pressure switch.
Just make sure your gauges are working correctly.
I would use an Infra red thermometer to verify that the engine is not overheating before you disconnect any sensors. When the problem occurs verify the temperature at the lower part of the thermostat housing is matching your gauge readings. You could even verify the gauge readings anytime the motor is running

[alex_52]

I think I figured out the problem . It turned out all much easier . I noticed that the temperature sensor that is next to the thermostat is above the level of antifreeze in the barrel that is installed in the rear of the engine, I just added antifreeze to the visual horizontal line between the sensor and the level in the tank . After that, the check engine lamp no longer lights up . Infrared thermometer measured the temperature of the engine near the sensor 170F . Is that a normal temperature ?

[mpost]

According to the parts manual for your 5.7L. it takes a 170 degree thermostat so that sounds good. Glad you found the problem.

[alex_52]

thank you for participating