1 86 K100 Weird temp sensor issue? Mon Feb 15, 2021 5:21 pm
Dustydogs
active member
I've had an issue with my K since I bought it 2 years ago, fan wasn't working as it was melted so I replaced it and everything worked as it should.
After a long ride turning into my driveway shortly after replacing the fan, the fan became intermittent, turning on, off, on etc. I switched the bike off and then no matter what temp the bike got up to afterwards, the fan wouldn't turn back on. Started troubleshooting, put power to the fan and it was working fine, cleaned the grounds under the tank, removed temp sensor cleaned grounds around the stub pipe, noticed a little bit of corrosion around one prong, cleaned it off and applied dielectric grease but none of this got the fan to turn on by itself. I wired in an over-ride switch and now just use that.
I've since replaced the temp relay switch under the tank, no change and then started swapping temp sensors but this is where things get weird -the bike will only idle with its original temp sensor. Any new replacement (I've tried 3 different ones despite all measuring correct ohms) causes the bike to flood the engine. It's like my ecu will only listen to this old temp sensor which is likely feeding an incorrect signal to the fan? I'm also seeing the overtemp light come on after 20mins of warm weather riding while the fan is running so there's that too... replaced thermostat but no change.
Any ideas or something I'm missing? Appreciate any help
After a long ride turning into my driveway shortly after replacing the fan, the fan became intermittent, turning on, off, on etc. I switched the bike off and then no matter what temp the bike got up to afterwards, the fan wouldn't turn back on. Started troubleshooting, put power to the fan and it was working fine, cleaned the grounds under the tank, removed temp sensor cleaned grounds around the stub pipe, noticed a little bit of corrosion around one prong, cleaned it off and applied dielectric grease but none of this got the fan to turn on by itself. I wired in an over-ride switch and now just use that.
I've since replaced the temp relay switch under the tank, no change and then started swapping temp sensors but this is where things get weird -the bike will only idle with its original temp sensor. Any new replacement (I've tried 3 different ones despite all measuring correct ohms) causes the bike to flood the engine. It's like my ecu will only listen to this old temp sensor which is likely feeding an incorrect signal to the fan? I'm also seeing the overtemp light come on after 20mins of warm weather riding while the fan is running so there's that too... replaced thermostat but no change.
Any ideas or something I'm missing? Appreciate any help