Oil temp fluctuations

[cpearce]

I am getting wildly fluctuating oil temp indications on my EMS D10. Engine off reading is steady. After engine start temp swings 2 or 3 degrees centred around 30. The variation increases as oil temp increases until at normal operating temp the swing is from 90 up to 150. I borrowed a new sensor but problem still existed. Also checked wiring at sensor -- looks ok. Loaded latest firmware as well. Have had 300 odd hours up and problem started about 20 hours ago. Any suggestions?

 

[dynonsupport]

100% of the time we have seen this, it's the ground connection between the engine and the airframe, or another ground in the plane. The oil temp sensor is very sensitive to this and gets more sensitive as it warms up.

Check over all your ground cabling for any breaks, fraying, corrosion, or just becoming loose. Also check the airframe to battery ground connection.