Erratic oil temp readings.
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Tuned
Joined: Jul 2017
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Erratic oil temp readings.
06 f250 stock. Oil cooler maybe year old. Been driving a lot for work and this code set second time for eot/ ect differential. Got laptop scanner w me on road and the eot is all over the place. 212 and back down to lower than ect temps and back up again.
assuming this sensor cropping out but never seen anything like it.
assuming this sensor cropping out but never seen anything like it.
Laughing Gas
Joined: Aug 2018
Posts: 934
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From: CA
Two things, first you can swap the sensor with the coolant temp sensor (they are the same) to see if the fluctuations follows the sensor. Second if the oil temp still fluctuates it may be the pigtail.
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Tuned
Joined: Jul 2017
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good stuff. Just can’t imagine eot could get lower then ect at any point except Cold
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Tuned
Joined: Jul 2017
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no, I get the purpose. I’m saying don’t think it’s physically possible for the oil to be lower than coolant. Why it has to be sensor or pigtail. I’ll give er a shot.
Fleet Owner
Joined: Nov 2003
Posts: 27,900
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If the oil temp is what seems out of place, I would look there first. Many times, you can see the heat and oil damage to the connector itself.
Temperature sending unit connector / pigtail (EOT, ECT, IAT2): Part # AP0056 (Alliant Power)
https://www.xtremediesel.com/alliant...pigtail-ap0056
https://prosourcediesel.com/shop/bra...ature-pigtail/
NOTE: Ford does not sell that connector.
Oil and Coolant Temperature sending unit (EOT, ECT sensor): 3C3Z-10884-AA
Temperature sending unit connector / pigtail (EOT, ECT, IAT2): Part # AP0056 (Alliant Power)
https://www.xtremediesel.com/alliant...pigtail-ap0056
https://prosourcediesel.com/shop/bra...ature-pigtail/
NOTE: Ford does not sell that connector.
Oil and Coolant Temperature sending unit (EOT, ECT sensor): 3C3Z-10884-AA
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
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From: Tuscaloosa, AL
I had the same thing happen, but it was my coolant temperature. The sensor and the pigtail is the same for the oil temp and coolant temp.
My problem is rodents had chewed up the 4 wire pigtail going to the EGR valve. Once I fixed that, I don't have the temp swings any more. Obviously the EGR valve pigtail had an impact on the coolant sensor. I was thinking it affected the 5V RefV, but that would have impacted more than just the coolant sensor. Oh well.
So, its either the sensor, the pigtail, or some other bad wiring issue. I'd check for a wiring issue first.
My problem is rodents had chewed up the 4 wire pigtail going to the EGR valve. Once I fixed that, I don't have the temp swings any more. Obviously the EGR valve pigtail had an impact on the coolant sensor. I was thinking it affected the 5V RefV, but that would have impacted more than just the coolant sensor. Oh well.
So, its either the sensor, the pigtail, or some other bad wiring issue. I'd check for a wiring issue first.
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dizzyfingers03
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