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Discussion Starter #1
This past weekend I replaced my oil cooler with a new oil cooler kit. Prior to the replacement my Edge Insight read 180-183 degrees ECT and 220-245 degrees EOT cruising at 65 on the highway. EOT would go up and not down.

Yesterday I went on a 1 hour trip and my ECT was 180 and my EOT was running 195-201. I am happy with the EOT temperatures, I think that they are well within normal, and the EOT's would go up and down as I would think they should. This leads me to my question.

I don't think that 180-183 is good for my ECT, I would expect to see 190-195 right? If that's the case, and assuming that my brand new oil cooler isn't defective, why the low coolant temperatures.

I did not replace the thermostat during my repairs, I did flush the entire system with VC-9 and added the appropriate amount of G-05 and distilled water. During my trip I kept an eye on the Edge and the ECT never got above 183 even when pushing it going up a hill. I'm thinking the following an need others experience:

1. Bad ECT sensor
2. Bad thermostat
3. Maybe the ECU flash level I am on (the one that buzzes the injectors after shutdown) misrepresents ECT.
 

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RIP Mitch ! We miss you
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Your ECT's are normal. I would be concerned about you EOT's. They are high, even though you just did your oil cooler. Something isn't right there. Just cruising with those ECT's your EOT's shouldn't be over 190.
 

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shhhhh, can you hear it?
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possible but if it is running 183 and not a sensor issues why would you want it to run hotter?colder is happier right?
 

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Discussion Starter #4 (Edited)
It's not that I want my ECT to be higher, I just want them to be more in sync with each other, and searching I see that a lot of guys are running about 190 on the coolant temperatures.

So if the coolant temperatures sound normal, what would make the EOT higher? I don't suspect the oil cooler, it has about 200 miles or so on it.

Oh and the reason I thought 180 was low is posts like this one. also in TSB 09-08-03, it states that in order to get an accurate differential between ECT and EOT, the coolant temperature should be 190 or greater. It makes me wonder if my coolant temperature was 190, would my oil temps be even higher, or does my truck just like the oil temperature to be in the 190's?
 

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I just had my oil cooler replaced 2 weeks ago also. my EOT was almost 233 and my ECT was 208. called my friend at ford and was told my oil cooler was bad. took it in and they checked my coolant, replaced the oil cooler and give my truck 4 new flashes. was told that the EOT and the ECT should be no more than 15 degrees between them. anything more and you have problems.
 

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Discussion Starter #6
What is your ECT and EOT's now after the replacement?
 

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Do you still have the EGR cooler in place?
Maybe the coolant passages in the EGR cooler are plugged and not letting enough water flow through the oil cooler?
Would this cause the oil outlet temp to be high?
 

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It may be time to look at external issues. Bent over fins on the radiator and the other coolers (restricted air flow) causeing water temps to be above normal. If the differential between the cooling media and the agent needing cooling is not enough you will increase temps in all the associated fluids. Also viseversa if one or more of the other fluids being cooled is above norm it can gradually decrease efficency. Clutch fan not working properly etc.
 

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This past weekend I replaced my oil cooler with a new oil cooler kit. Prior to the replacement my Edge Insight read 180-183 degrees ECT and 220-245 degrees EOT cruising at 65 on the highway. EOT would go up and not down.

Yesterday I went on a 1 hour trip and my ECT was 180 and my EOT was running 195-201. I am happy with the EOT temperatures, I think that they are well within normal, and the EOT's would go up and down as I would think they should. This leads me to my question.

I don't think that 180-183 is good for my ECT, I would expect to see 190-195 right? If that's the case, and assuming that my brand new oil cooler isn't defective, why the low coolant temperatures.

I did not replace the thermostat during my repairs, I did flush the entire system with VC-9 and added the appropriate amount of G-05 and distilled water. During my trip I kept an eye on the Edge and the ECT never got above 183 even when pushing it going up a hill. I'm thinking the following an need others experience:

1. Bad ECT sensor
2. Bad thermostat
3. Maybe the ECU flash level I am on (the one that buzzes the injectors after shutdown) misrepresents ECT.
I have seen a bunch of thermostats fail in the stuck open position. Most people complain about lack of heat in the winter when they get fail open.
 

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Discussion Starter #10
But the coolant temperatures are 180, what could I check for oil temperatures?

I think that the heat in the winter stinks. Maybe I'll replace the thermostat and see what happens, what do I have to lose right?
 

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Discussion Starter #12
Do you still have the EGR cooler in place?
Maybe the coolant passages in the EGR cooler are plugged and not letting enough water flow through the oil cooler?
Would this cause the oil outlet temp to be high?
This is a good question, yes I left my EGR cooler alone. When it was out, I flushed it with tap water from the hose then with compressed air to remove anything that was in there. It seemed to flow fine, but I have no reference point.

I'm going to go to the dealer today to get a new thermostat. This is my first Powerstroke so what is normal or not is difficult for me since I don't have any reference points. I do think that it takes a long time to warm up, but I just attributed that to being a Diesel. In any event, the TSB says to get an accurate measurement of the difference for the ECT to be 190, then that's what I'll do and report back.

I appreciate the help and suggestions.
 

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Yep, sounds like your thermostat to me.
 

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Discussion Starter #14
Well, new thermostat is in, and the truck is getting to 190 easily now. Here's my new numbers:

58°F Amb / 55 mph / 190°F ECT / 209.8°F EOT / 150.2°F Trans
58°F Amb / 30 mph / 190°F ECT / 207.0°F EOT / 150.2°F Trans

I'm wondering if I got a bad oil cooler somehow? I would hate like heck to experiment by buying another oil cooler, I really don't want to go through that again! Maybe a bad oil temp sending unit? I'm at a loss here.
 

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Hmmm. Perfect on the ECT side and hot on the EOT side with a new oil cooler. I'm now wondering about LPOP volume since the oil cooler is presumed to be good. I have never heard of a bad oil temp sending unit, although I am sure they fail but I would expect to not read anything as opposed to being higher than normal.
 

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oops I miss-typed. The tsb says above 190, but your results are accurate enough. 3 degrees on ect ain't gonna change it significantly. You should let your truck sit overnight and then with a cold motor see if your oil temp matches your coolant temp before you start it. That would be the only way to tell if the sensor was actually bad without just replacing it.
 

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Discussion Starter #17
I'll check the numbers in the morning. I'm at a complete loss what could be going on. I did get the oil cooler core off of ebay, but it came in a ford box with the sealed gasket parts. The cooler looked brand new, there is no reason for me to think otherwise. I sure don't want to tear this apart again, I didn't enjoy it the first time at all!
 

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Discussion Starter #19
Yes, the screen, turbo drain tube and fuel regulator were replaced. The old screen was torn but complete.
 

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Discussion Starter #20
Without running the truck, Sun still down:

ECT bounced between 52 and 54 (on the edge)
EOT was 55
Trans 52
 
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