Does the 6.0 have a defuel if it senses the oil's too hot?? - Ford Powerstroke Diesel Forum
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Old 11-02-2007, 09:42 AM
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Does the 6.0 have a defuel if it senses the oil's too hot??

I am wondering this, because no one can seem to figure out my problem. I've had it at dealers and what not. No one can duplicate. I have the right power when I first start my truck up in the morning, barely touch the go pedal and it takes off, after about 5 10 minutes of driving, it becomes lathargic, and has nowhere near the amount of power it should. Someone suggested that when my headgaskets blew, it contaminated the oil cooler, and that it is plugged, and not cooling the oil properly which in turn is causing the ecu to defuel because it's sensing the oil is too hot. It makes sense with my symptoms, but I don't know if the 6.0 has this program.

Thanks,

Hoss
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Old 11-02-2007, 09:50 AM
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thats a good question, i don't know.
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Old 11-02-2007, 11:16 AM
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Anybody have any ideas?
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Old 11-02-2007, 12:03 PM
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Here is what I could find. It looks like its a possibility it could be causing your low power condition. No other codes?

EOT (Engine Oil Temperature)
The EOT sensor is a two (2) wire thermistor type sensor.
The PCM supplies a 5 volt reference signal which the EOT sensor uses to produce an analog voltage that indicates temperature.
The PCM monitors engine oil temperature via the EOT sensor signal to control EGR, glow plugs, VGT, and fuel quantity and timing throughout the operating range of the engine.
The EOT signal allows the PCM to compensate for oil viscosity variations due to temperature changes in the operating environment, ensuring adequate power and torque are available for all operating conditions.
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Old 11-02-2007, 01:26 PM
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No, that is the other thing I was told, is that it doesn't throw any codes. Other than a low power condition it runs perfect. Thanks for the info. I wish the cooler wasn't so dange expensive, I would just have my guy put it on. But it's 700.00. I have to take it to a dealer, and hopefully they will cover it, due to it being related to my head gaskets giving out. We'll see what the temp difference is, what's the max difference between the coolant and the oil suppose to be? 20 or 25 degrees something like that.
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Old 11-02-2007, 01:29 PM
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Im not sure of the temp differntial Someone will chime in with the answer.
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Old 11-04-2007, 06:17 AM
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Yes, fueling is based on engine oil temp. Have you scanned your oil temp?
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Old 11-04-2007, 08:56 AM
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This is a direct outtake from the 2005 6.0 PCED. The temp differential should be no more than 10 degrees when the coolant temp is above 195 degrees. They have also have had problems with the EGR cooler leaking due to the oil cooler being restricted and not allowing enough coolant to the EGR cooler.

The PCM adjusts the injector output based on the oil temperature information received from the engine oil temperature (EOT) sensor and turbo boost information received from the manifold absolute pressure (MAP) sensor and the barometric pressure (BARO) sensor. These corrections are necessary to meet emissions requirements and to optimize power. The engine coolant temperature (ECT) and the EOT sensors are used as the primary input to the PCM to enable adaptive cooling. This provides a means of providing adequate cooling in severe engine temperature conditions. When the ECT is greater than 105C (221F) or the EOT is greater than 123C (253F), the fueling rate of the engine is modified to provide cooling protection and prevent engine damage due to overheating.

Last edited by forddieseldoctor; 07-25-2010 at 08:10 AM.
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