Ford 6.0L Power Stroke Diesel :: Low Oil Temperature - EOT Jumping Around For No Apparent Reason
Feb 6, 2016
I've had a Scan Gauge II in the truck for the last 3+ years and usually have it showing ECT EOT FICM main power and volts. For all that time, my numbers have been normal until last month. With the engine up to temperature (ECT at 190 or higher), my EOT is lagging behind - sometimes 20* cooler. I've also noticed the EOT jumping around for no apparent reason.
From what I understand of the 6.0 cooling system, the oil is cooled by the coolant and what I'm seeing shouldn't happen if the engine is up to temperature. The obvious fix is to swap out the EOT sensor but I figured I'd ask the experts first. Any thoughts?
2005 dually crew cab with 105k.
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It has happened on the following three occasions but it is intermittent and does not do it all the time:
1. driving up a long grade at 45 mph for 5 minutes. I stepped on the accelerator to speed up and it happened.
2. Getting on the highway from 45 to 70 fairly quickly.
3. Once I got on the throttle heavy and got up to 80 MPH. I laid off the throttle to slow down and when I stepped on the accelerator again it happened.
I was not towing at any of these times. I do have warranty still but since I cannot always replicate it, I have not taken it to the dealer yet.
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