Is my EOT too high?
2006 Bullet-Riddled 6.0
Joined: Sep 2011
Posts: 651
Likes: 5
From: Sac River Delta Ca.
I would first go to Ford and buy both of the temperature senders for oil and coolant. Then look at their readings after trucks been cooled off overnight. You may have some Chinese senders screwing with you. Then take it out and see how the temps are doing. The senders are not expensive and both are identical parts.
Until you do that its no point because 40 degree swings don't happen. 25* differences in the morning is nuts. CHANGE THEM.
Until you do that its no point because 40 degree swings don't happen. 25* differences in the morning is nuts. CHANGE THEM.
Fleet Owner
Joined: Nov 2003
Posts: 27,900
Likes: 3,617
If you can't recall the brand/type of coolant, then what color is it? Can't really use color as a 100% positive identifier, but it can give us a good guess.
2006 Bullet-Riddled 6.0
Joined: Sep 2011
Posts: 651
Likes: 5
From: Sac River Delta Ca.
Once you know the temps are accurate a 20 mile run at 65 mph on level ground will tell you exactly how the oil coolers health is.
Now if the temps are high on oil cooler that can be caused by coolants being mixed improperly with different types of coolant. That can gell up and plug the oil cooler in no time.
Can do a taste test on the coolant: If it tastes like crap its Ford Gold Sweet its a ELC..................LOL
But you have to walk before you run change the temp sensors first so we know whats real.
Now if the temps are high on oil cooler that can be caused by coolants being mixed improperly with different types of coolant. That can gell up and plug the oil cooler in no time.
Can do a taste test on the coolant: If it tastes like crap its Ford Gold Sweet its a ELC..................LOL
But you have to walk before you run change the temp sensors first so we know whats real.
2006 Bullet-Riddled 6.0
Joined: Sep 2011
Posts: 651
Likes: 5
From: Sac River Delta Ca.
Mark your always a step ahead of me. I am guessing you suspect a coolant problem from mixing possibly. The temps are too wild from what hes telling us. I agree thats his starting point : two new senders. Then we can help him from there.
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
I'm wondering about the NAPA coolant. I think they sell a Zerex that is labeled for diesels, but that is about as much as I know. If the tech just grabbed the old "one size fits all" jug then it would sure lead to some issues.
I don't think it has any SCA's either.
I don't think it has any SCA's either.
Token Redneck
Joined: Jun 2007
Posts: 9,337
Likes: 346
From: Breckenridge, TX
Just to backtrack a second.
Josh, the OP, has oil temps at 40*+ over ECT while towing, even at his weight 40* seems excessive. He hasn't told us cold soak temps yet, so he doesn't need to change any sensors until he does and we see a problem.
Chase, replying in post #3, has the 20-25* cold soak split. He needs to swpa his ECT and EOT sending units, keep the one that's closest to TFT, and replace the other.
Josh, the OP, has oil temps at 40*+ over ECT while towing, even at his weight 40* seems excessive. He hasn't told us cold soak temps yet, so he doesn't need to change any sensors until he does and we see a problem.
Chase, replying in post #3, has the 20-25* cold soak split. He needs to swpa his ECT and EOT sending units, keep the one that's closest to TFT, and replace the other.
Fleet Owner
Joined: Nov 2003
Posts: 27,900
Likes: 3,617
When it's cold, or even when I got off the interstate and into my town, the two temps sync right up. The few times I watched the temps, I've seen that 10-15 gap and kinda expected that this time around.
The oil cooler came from Ford. I don't recall the brand of coolant off the top of my head, but it's from Napa, same specs that the truck requires, or so my diesel mechanic buddy told me.
The oil cooler came from Ford. I don't recall the brand of coolant off the top of my head, but it's from Napa, same specs that the truck requires, or so my diesel mechanic buddy told me.
Now that I have been on my soapbox, I took this post to be his response to both Mike and Chase, ie he feels that his cold soak temperatures are fine. I could have easily read more into it than intended though.
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Thread Starter
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Senior User
Joined: Jun 2016
Posts: 264
Likes: 2
I thought the tuner showed me EGT but it appears it does not. So, no I am not monitoring that. I do have the EGR delete...not that it makes a huge difference. But probably should have mentioned that before.
I had a job for the truck this morning, but it was only about 3 miles from the house. I did have to tow my excavator though, so it had some stress to it. I took some random numbers this morning.
Cold start:
Coolant was 52 and EOT was 53.23
Random check while loading:
Coolant was 126 and EOT was 120.21
Idling while loading up the trailer and the first time I saw the oil get hotter than the coolant:
Coolant was 142 and EOT was 143.70
Left the house with the trailer:
Coolant was 152 and EOT was 156.43
Driving down the road about 40MPH:
Coolant was 168 and EOT was 166.38
Driving down mainstreet about 35MPH in town:
Coolant was 190 and EOT was 196.86
Arrived at my destination a couple minutes later:
Coolant was 190 and EOT was 196.86
Fleet Owner
Joined: Nov 2003
Posts: 27,900
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That temperature profile looks very normal to me. Thank you for posting the numbers.
The only thing we can't tell from that is if the EOT would have kept on going up some from the 196 / 197 value at a 65 mph highway run.
The only thing we can't tell from that is if the EOT would have kept on going up some from the 196 / 197 value at a 65 mph highway run.
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Senior User
Joined: Jun 2016
Posts: 264
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i confirmed that my truck has the G05 coolant in it. When we did the oil cooler and EGR delete last summer, we drained all the coolant and refilled. We did not do a flush and I have no clue what was in it before hand.
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Senior User
Joined: Jun 2016
Posts: 264
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I will head out here in a bit and get those numbers for you guys.
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Senior User
Joined: Jun 2016
Posts: 264
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Highway trip numbers:
Started off basically the same, in the high 150's..It's about 5 miles to the interstate along a 55 mph road. Coolant hugged 190 the whole time and EOT was about 200. I didn't drive as far on this trip (as compared to when I towed) because the numbers were already high. Coolant stayed between 188-190. But the EOT temp was ranging from 206-208. After I got off the interstate, it took much longer for the oil to cool off as compared to the other day when I was towing. It's 3 miles of low speed road back home on this direction and once I arrived home, coolant was at 190 and EOT was at 202. The other day the EOT on this same stretch of 3 miles was much lower, much closer to the coolant temp. Today is much cooler too. It's 35 out and raining.
I did notice a couple of times that the EOT reading seemed to be frozen. Did someone say I can switch the pig tails between the coolant and EOT sensors and run it like that to see if my readings change?
Started off basically the same, in the high 150's..It's about 5 miles to the interstate along a 55 mph road. Coolant hugged 190 the whole time and EOT was about 200. I didn't drive as far on this trip (as compared to when I towed) because the numbers were already high. Coolant stayed between 188-190. But the EOT temp was ranging from 206-208. After I got off the interstate, it took much longer for the oil to cool off as compared to the other day when I was towing. It's 3 miles of low speed road back home on this direction and once I arrived home, coolant was at 190 and EOT was at 202. The other day the EOT on this same stretch of 3 miles was much lower, much closer to the coolant temp. Today is much cooler too. It's 35 out and raining.
I did notice a couple of times that the EOT reading seemed to be frozen. Did someone say I can switch the pig tails between the coolant and EOT sensors and run it like that to see if my readings change?
Fleet Owner
Joined: Nov 2003
Posts: 27,900
Likes: 3,617
I know Ford Gold is a GO5 coolant, but it is not robust enough for the temperature extremes the 6.0L can see. It will gel up and drop silicates out if metal skin temperatures get too high. I am concerned that you are experiencing this.