Let the truck sit for 18 hours or so and check the temps before you start it. The should be within a degree or two of each other. If EOT is more than 2 degrees or so above ECT then you could have a bad sensor. I'm pretty sure they're interchangeable so you could swap them and see if the problem follows. I would double check about being interchangeable first though I'm not 100% on that. If they're within 2 degrees though then you definitely have a clogged oil cooler. I'm thinking you do anyways. Does ECT ever reach 190? 190 is considered normal operating temp but 188.6 is pretty close

 

I've never seen my ECT get over 190, even at wide open throttle I think max its 190. but for the most part it sits at 188. I Forgot to add that the EGR is deleted and I will definitely let my truck sit and check it in the morning.

I tried looking up where the sensors are but the EOT sensor doesn't seem to be easy to access if I'm not mistaken and instructions on the ford manual that I've been seeing isn't very clear to me. But would a sensor cause only a delta of 15-20? or would it be higher?

Heres a pic of the temps I was running today.

 

Good news is since you have an EGR delete the delta isn't as important which means as long as you don't tow too heavy you have time before you need to change it again. Also if you don't have a coolant filter add one and do a flush, once you stop getting junk in the filter install the new OEM oil cooler.

 

Many have had some success backflushing the cooler in place. Might want to try that first...

 

Sweet thanks everyone for the input. I am getting a XDP coolant filter tomorrow and going to flush the coolant and back flush it and throw that ELC coolant everyone is talking about.

Does anyone know what problems could occur running the truck with 215 degree oil temp if the EGR is already deleted? I was planning on doing a 500 mile trip and I'm strongly reconsidering it.

 

The ideal oil temp is 210F and I wouldn't worry till the oil gets over 235F. The oil temperature does not affect the EGR, the oil temperature delta lets you know the EGR is being starved of coolant from a clogged oil cooler. Since you're deleted the 15F oil coolant delta isn't as important.

 

Use promo code DIESEL10 for 10% when you order the coolant filter

 

I agree with the comments above regarding backflushing, etc. My additions:

1) The EOT and ECT sensors are interchangeable.
2) Running with an elevated EOT is okay (when EGR deleted) but the engine will defuel when EOT reaches 254F. You'll want to avoid letting things get that far out of control.

I recommend switching to synthetic - if you aren't already running it. That stuff will take your elevated temps all day every day until you can get the problem sorted out.

 

Thanks everyone for the input. I just changed the oil with rotella t6 and Motorcraft filter on Saturday. I'm installing a coolant filter tonight and running it to see if that makes a difference. I've only managed to get it up to 220 going uphill at 65 so far but it quickly goes down to the 210-216 range fast after I get off of it.

I looked at the temps this morning and the oil temp and coolant temp were within 2 degrees of each other. So I'm almost sure it's not the sensor at this point.

I'll be posting if the coolant filter makes a difference. If not I'll be trying to back flush and give the truck some nice coolant.

All else fails an oil cooler receipt is defiantly coming my way. But it's ok do drive long distances (500 miles) with the oil temp at around 210-220?

Thank you again everyone.

 

I got my oil cooler for my 6.4 from AutoNation Ford White Bear Lake | Parts & Accessories for $245

 

As said, with the EGR delete, 230° oil is not a big problem, especially if it's synthetic. Depending on the year model and strategy, I believe the PCM will start to defuel at somewhere around 255° oil temp. Not sure of the exact number.

 

Quick question, have you looked at your coolant? Is there any oil in it? That would be a definite ruptured oil cooler. Hopefully yours is just plugged up. A flush may not fix it but you might be able to prolong it's life for your trip. A coolant filter is an excellent idea, I have one on mine,but it won't fix your temperature problem. The coolant filter is only there to help keep the oil cooler from getting plugged up in the first place. As far as driving that far with those temps IMO you'd be fine as long as you aren't pulling a load. Good luck to you though!

Sent from my SM-N910V using Tapatalk

 

Quick question, have you looked at your coolant? Is there any oil in it? That would be a definite ruptured oil cooler. Hopefully yours is just plugged up.

I have checked the coolant in the degas bottle and the coolant that just went all over my garage floor after installing the coolant filter. It is clear and free of oil and there is no residue on the degas bottle.

A coolant filter won't make a difference for a clogged cooler but a backflush might. However if you filter out most of the junk it will exponentially extend the life of the next OEM cooler as long as change the filter regularly.

Yea that was my hope to filter as much much crap out of the system as possible. I am also hoping a backflush will work because of the temps not going to high so I'm thinking it might not be as plugged up as it could be.


On another note, this morning when my truck was nice and cold I noticed that my coolant temp kept going back and forth maybe every 15 seconds from 64.6 to like 62.8 without the truck on (it would flicker just for a second to 62.4). Im assuming this means that the sensor is going bad am I correct? or is this normal?

 

Change your coolant filter after 500 miles and cut it open. You'll be disgusted

 

yea I plan on changing the coolant filter then. I just did a 70-75 mph run (it only got this hot after driving 30 mins at that speed) and I got the EOT a lot higher than expected. I know its still within drivable range but I just plan on changing the oil cooler and coolant after my trip so I don't have to spend another $150 on supplies for a coolant flush. Just thought id give y'all an update and if something else looks off definitely let me know.

Thank you everyone again for all the help. Y'all saved me a lot of stress and time.