EOT & ECT Spread
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Joined: Sep 2010
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From: The Woodlands, TX
EOT & ECT Spread
On my way back from a small road trip this evening, I noticed my spread a little larger than usual. My EOT reached 208 with my ECT at 197. It didn't last long as traffic came to a crawl about 4 mins after I noticed the difference and couldn't get it back to that spread again over the next hour of my trip. I know that alone isn't really much to be concerned about and I may be a little OCD about my truck, but my spread has never been more than six degrees and it's usually only four degrees. Anyone think of any potential issues? Usual operating temps for me empty are 203 & 199 (EOT & ECT).
Wasn't towing. Fairly flat grade minus a few good sized overpasses. Ambient temp was 80 degrees. Fluids are all fine, no codes.
I'm thinking it's just a fluke, but like I said, I'm OCD/Paranoid about my truck and just want to make sure it's not an issue.
Wasn't towing. Fairly flat grade minus a few good sized overpasses. Ambient temp was 80 degrees. Fluids are all fine, no codes.
I'm thinking it's just a fluke, but like I said, I'm OCD/Paranoid about my truck and just want to make sure it's not an issue.
Laughing Gas
Joined: Feb 2007
Posts: 950
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From: Waco, Texas
I was coming in from Texarkana to Waco, via Dallas, towing, and my EOT and ECT spread was around 3 degrees on the flat, going up the few hills there, I would get as much as a 12 degree spread for a bit. The Intake Air temp was 140 degrees most of the time so the ability to cool quickly was absent. Even empty, I see spreads and always have seen the heat spread of 3-15 degrees. I don't worry about it as long as it starts coming down when I take the load off. FYI, the ambient temp was 100 most of the way and the EOT never got above 215 and the EOT never got over 208 traveling 65.
Lead Driver
Joined: Jan 2006
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Mine always was within a few degrees, then one day 5-6 degress, then within a week around 10 deg difference.
Now even if it's cold out the EOT is way over ECT.
I still don't fully understand how oil coolers fail, I have to imagine the surface of the metal gets built up with crud. I don't know if the problem is on the oil side or the coolant side.
Now even if it's cold out the EOT is way over ECT.
I still don't fully understand how oil coolers fail, I have to imagine the surface of the metal gets built up with crud. I don't know if the problem is on the oil side or the coolant side.
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From: The Woodlands, TX
Pulled a 9,000lb tandem trailer today about 60 miles highway. Temps were EOT 214 and ECT stayed low at 201-203. Then I drove empty back and was at my norm 203 & 199 (4 degree spread).
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From: The Woodlands, TX
I didn't think so, but I figured I'd share just in case.
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From: Frederick, MD
I am not the authority but I think when you are towing and really working the motor up and down the hills alot of the point spread can really vary from hill to hill so that is why I'd ignore it while towing.
I had some nice ones today that probably would have sent me into the shop if we went by that while towing.
I had some nice ones today that probably would have sent me into the shop if we went by that while towing.
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From: Coldwater, MS
Last Saturday my ECT and EOT started to get further apart, normally they were always within a degree or two of each other (198-200). My ECT and EOT dash gauges looked normal with their needles in the exact same place they always are, but my Scangauge II was showing temp splits of 25F-30F. The wrench light on the drivers information display illuminated and the truck went into reduced power mode. I got my truck to the dealer on Monday and after they looked at it they said the computer had stored temp splits as high as 40F. They said there are tiny fins inside the cooler that get coated/clogged with coolant, maybe as the coolant breaks down. Not really sure.
My F-250 is a Job 1 2008 with 102,850 miles on the odo. Pretty big bill to replace the oil cooler though...
Oil Cooler, Dual Thermostat Kit, New Oil & Filter, New Coolant = $535
30 Hours Labor @ $76 an hour (by the book to lift cab) = $2280
Tax & Shop Supplies = $316
TOTAL = $3131
My F-250 is a Job 1 2008 with 102,850 miles on the odo. Pretty big bill to replace the oil cooler though...
Oil Cooler, Dual Thermostat Kit, New Oil & Filter, New Coolant = $535
30 Hours Labor @ $76 an hour (by the book to lift cab) = $2280
Tax & Shop Supplies = $316
TOTAL = $3131
Thread Starter
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Posting Guru
Joined: Sep 2010
Posts: 2,213
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From: The Woodlands, TX
Last Saturday my ECT and EOT started to get further apart, normally they were always within a degree or two of each other (198-200). My ECT and EOT dash gauges looked normal with their needles in the exact same place they always are, but my Scangauge II was showing temp splits of 25F-30F. The wrench light on the drivers information display illuminated and the truck went into reduced power mode. I got my truck to the dealer on Monday and after they looked at it they said the computer had stored temp splits as high as 40F. They said there are tiny fins inside the cooler that get coated/clogged with coolant, maybe as the coolant breaks down. Not really sure.
My F-250 is a Job 1 2008 with 102,850 miles on the odo. Pretty big bill to replace the oil cooler though...
Oil Cooler, Dual Thermostat Kit, New Oil & Filter, New Coolant = $535
30 Hours Labor @ $76 an hour (by the book to lift cab) = $2280
Tax & Shop Supplies = $316
TOTAL = $3131
My F-250 is a Job 1 2008 with 102,850 miles on the odo. Pretty big bill to replace the oil cooler though...
Oil Cooler, Dual Thermostat Kit, New Oil & Filter, New Coolant = $535
30 Hours Labor @ $76 an hour (by the book to lift cab) = $2280
Tax & Shop Supplies = $316
TOTAL = $3131
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
I doubt the filter would help anything, I don't think it's solids that settle on the fins, I think it's solids that form ON the fins, from the temperature.
Thread Starter
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Posting Guru
Joined: Sep 2010
Posts: 2,213
Likes: 1
From: The Woodlands, TX
Last Saturday my ECT and EOT started to get further apart, normally they were always within a degree or two of each other (198-200). My ECT and EOT dash gauges looked normal with their needles in the exact same place they always are, but my Scangauge II was showing temp splits of 25F-30F. The wrench light on the drivers information display illuminated and the truck went into reduced power mode. I got my truck to the dealer on Monday and after they looked at it they said the computer had stored temp splits as high as 40F. They said there are tiny fins inside the cooler that get coated/clogged with coolant, maybe as the coolant breaks down. Not really sure.
My F-250 is a Job 1 2008 with 102,850 miles on the odo. Pretty big bill to replace the oil cooler though...
Oil Cooler, Dual Thermostat Kit, New Oil & Filter, New Coolant = $535
30 Hours Labor @ $76 an hour (by the book to lift cab) = $2280
Tax & Shop Supplies = $316
TOTAL = $3131
My F-250 is a Job 1 2008 with 102,850 miles on the odo. Pretty big bill to replace the oil cooler though...
Oil Cooler, Dual Thermostat Kit, New Oil & Filter, New Coolant = $535
30 Hours Labor @ $76 an hour (by the book to lift cab) = $2280
Tax & Shop Supplies = $316
TOTAL = $3131
