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2005 mercury 90hp elpto 1b102619

B

billpeak

New member
as soon as i turn the key on i get an alarm, this is a steady bussing constlantly. I replaced the oil injector switch . and the alarm still sounds.is there another senor ? .
 
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Yes, that sounds like a toasted temp sensor.

When they die they "alarm" which is much better than being quiet and allowing you to fry the motor if it overheats.

The sensor is located directly below the thermostat cover.

It has a black wire coming from it. Follow that wire and disconnect it where it hooks up. If the alarm goes away, replace the sensor.

Running with it disconnected could lead to a "real" overheat and a couple thousand bucks worth of internal engine damage...
 
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