Full Operating Temp - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 04-23-2013, 02:07 PM Thread Starter
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Full Operating Temp

I changed the oil in my truck yesterday, and now my full operating temp deltas are 162 ECT and 169 EOT...I used Rotella Synthetic 15-40 in it. Any clue as to what my issue is?

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post #2 of 7 Old 04-23-2013, 03:05 PM
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Well you would need two faulty sensors, but I guess that's a possibility. Are temps close to outside temps after not running overnight?

Maybe your T-stat is stuck open and truck is never warming up?


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post #3 of 7 Old 04-23-2013, 03:20 PM Thread Starter
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Yes, temps are very close to outside temps, when sat overnight.

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post #4 of 7 Old 04-23-2013, 03:25 PM
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how long did you run the truck for. and usually when a thermostat get stuck open it still warms up to about 180*.

06 F350 King Ranch
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post #5 of 7 Old 04-23-2013, 04:07 PM Thread Starter
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I ran it for 25 miles of low 4 lane driving.

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post #6 of 7 Old 04-27-2013, 01:31 PM
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I would say the thermostat is not operating correctly. When I bought my truck, I got 170 ECT readings at operating temp. I changed to a new Ford thermostat, and it went to 192. Now, 30,000 kms later, my regular ECT is 189.

I'm considering trying to get a 195 or 200 thermostat soon, to see if t will increase my MPG.

Check your top Rad hose during the warm up cycle. It should stay cool (realtively) until the thermostat opens, and then it would feel much warmer. If the therm is partly stuck open, then the hose would just warm up progressively with the engine.

Good luck.

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post #7 of 7 Old 04-27-2013, 02:17 PM
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You problem is totally unrelated to your oil change. It seems your thermostat has decided it wants to be replaced.

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