Purchased 2000 model 3075 Crusiers Yacht 2 months ago and have had port engine warning light comming on when throtteling up and when cruising above 2800 rpm. I have had mechanics check out the engine with a computer monitor but no codes are found. We had the computer hooked up when the port light and horn were sounding and there were no codes.<br /><br />We have tried and replaced the following:<br />Replaced Alternator<br />Replaced Distributor<br />Cleand Throttle body intake<br />Tested all sensors for possible electrical problem<br />Replaced seawater pump<br />Replaced warning horn<br />Tested all wiring to motor, transmission, battery and generator.<br /><br />I think the only three things that can set off the warning sensor are:<br /><br />Engine Temp<br />Oil presure or<br />Transmission overheating<br /><br />All gauges show normal readings when the warning light comes on. These Horizon 5.7 Mercrusiers have an engine protection that shuts them down to 2500 rpm if there is a code or malfunction. This is not happening, even when the warning light is on I am able to bring the engine to full throttle.<br /><br />The engine seem to be running fine and shows no cause for the warning light. I have had 3 Mercrusier mechanics look at the engine and all agree the engine is running fine.<br /><br />If anyone has any ideas or has had this experience please HELP!!!
