ECT 1 to 2 degrees higher than EOT at idle - Ford Powerstroke Diesel Forum
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Old 07-07-2011, 01:03 PM
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ECT 1 to 2 degrees higher than EOT at idle

I've noticed lately that after my truck idles for about 5 to 10 minutes, after driving it, my ECT is +- 1 to 2 degrees higher than the EOT. Is that normal? I don't seem to remember it being like that in the past.
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Old 07-07-2011, 01:29 PM
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Check it when the truck is cold and before starting it. See if the sensors read 1 to 2 degrees of each other. They should be. If they are not, you may have a bad sensor.
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Old 07-07-2011, 03:38 PM
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The fluid on both sides of a heat exchanger are rarely ever the exact same temp. I would consider this normal. The delta between the two is only valid when running downthe highway at full operating temp. At idle there is no load other than the AC and charging system.
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