Hello all. Its been a while since I posted here. I have a weird problem with my motor. It is randomly going into SLOW mode due to overheating. Using an IR temp sensor the upper cylinders measure 150+/-, the lower cylinders measure 180+/-. I have "thrown" the following parts at the problem:
Cooling system: new impeller, thermostat
Fuel system: new in-line filer, new cartridge filter, replace VRO pump with non-VRO pump (I have been pre-mixing since I bought the boat, 10+ years ago).
Electrical: new power pack, new coils, new plugs, new thermal sensor.
If the thermal sensor wire is disconnected from the power pack, the problem goes away. Other VRO alarm wires have been disconnected (low oil,etc_).
During this process I have "fixed" the problem a number of time only for the problem to return. Sometimes SLOW occurs within 2-3 minutes of running on plane. Sometimes it doesn't occur at all with the motor running flawlessly for over an hour.
This motor runs great, idles great. I am at a loss as to the next step. Any ideas on what to throw at it next?
Cooling system: new impeller, thermostat
Fuel system: new in-line filer, new cartridge filter, replace VRO pump with non-VRO pump (I have been pre-mixing since I bought the boat, 10+ years ago).
Electrical: new power pack, new coils, new plugs, new thermal sensor.
If the thermal sensor wire is disconnected from the power pack, the problem goes away. Other VRO alarm wires have been disconnected (low oil,etc_).
During this process I have "fixed" the problem a number of time only for the problem to return. Sometimes SLOW occurs within 2-3 minutes of running on plane. Sometimes it doesn't occur at all with the motor running flawlessly for over an hour.
This motor runs great, idles great. I am at a loss as to the next step. Any ideas on what to throw at it next?