high EOT temps while pulling 12k lb trailer
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Mountain Pass
Joined: Sep 2003
Posts: 143
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From: So Cal
high EOT temps while pulling 12k lb trailer
I recently added an Edge CTS3 tuner to my 2004 6.0 to help with towing power but months ago set it from level 1 back to stock tune. I did this as I learned what all the numbers meant and was alarmed at the EOT temps. I have seen some EOT temps pulling my 12k lb bumper pull toy hauler as high as 253 up a grade and with no trailer going up a decent grade at 75mph for 5+ minutes of 230. All while never seeing a ECT temp of more than 200, typically around mid 190. I assume the engine oil cooler is clogged and needs to be swapped. I am just wondering if I am just pushing the truck to hard and the oil cooler upgrade is not necessary. I am talking with my dealer about putting in the Bullet Proof Diesel Oil System Upgrade kit which is about $2700.
The truck is basically stock since I bought it on '04 besides the 5.5" lift and 35" tires that have been on it since '04. In 2018 I had the Bulletproof Diesel EGR cooler done by my dealer and a turbo rebuild. Head bolts and new turbo were done back in '06.
I just did the water pump, 7.3 mechanical fan clutch and thermostat. I was hoping one would help but no dice. Should I see 230 EOT doing 75 up a decent hill while only seeing 194 ECT? Then the extreme a couple weeks ago, 253 EOT with 214 ECT temps pulling my 12k lb trailer. Is this normal or not at al, I need to do the engine oil cooler?
The truck is basically stock since I bought it on '04 besides the 5.5" lift and 35" tires that have been on it since '04. In 2018 I had the Bulletproof Diesel EGR cooler done by my dealer and a turbo rebuild. Head bolts and new turbo were done back in '06.
I just did the water pump, 7.3 mechanical fan clutch and thermostat. I was hoping one would help but no dice. Should I see 230 EOT doing 75 up a decent hill while only seeing 194 ECT? Then the extreme a couple weeks ago, 253 EOT with 214 ECT temps pulling my 12k lb trailer. Is this normal or not at al, I need to do the engine oil cooler?
Fleet Owner
Joined: Nov 2003
Posts: 27,900
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I think you probably already know the answer to your question. It is one of the top 2 or 3 discussed 6.0L topics!
That being said, you need to assure yourself that the EOT sensor is working properly. One check is to compare EOT, ECT, TFT, IAT1, IAT2 all at completely cold conditions (ie in the morning after the truck has been allowed to sit overnight to cool).
That being said, you need to assure yourself that the EOT sensor is working properly. One check is to compare EOT, ECT, TFT, IAT1, IAT2 all at completely cold conditions (ie in the morning after the truck has been allowed to sit overnight to cool).
Thread Starter
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Mountain Pass
Joined: Sep 2003
Posts: 143
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From: So Cal
I think you probably already know the answer to your question. It is one of the top 2 or 3 discussed 6.0L topics!
That being said, you need to assure yourself that the EOT sensor is working properly. One check is to compare EOT, ECT, YFT, IAT1, IAT2 all at completely cold conditions (ie in the morning after the truck has been allowed to sit overnight to cool).
That being said, you need to assure yourself that the EOT sensor is working properly. One check is to compare EOT, ECT, YFT, IAT1, IAT2 all at completely cold conditions (ie in the morning after the truck has been allowed to sit overnight to cool).
I did check this morning and the EOT and ECT temps read in the low 50s before I started the truck. Also when I got off the freeway this morning after pushing the truck to 230 up a grade, I read on the passenger side of the oil pan, 230 degrees.
BTW, what is YFT? This morning the Edge said IAT was 44.
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Mountain Pass
Joined: Sep 2003
Posts: 143
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From: So Cal
Ahh, thank you. The highest I have ever seen TFT has been 184.
Fleet Owner
Joined: Nov 2003
Posts: 27,900
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If they all read the same on a completely cold engine, then the sensors are PROBABLY ok.
If the EOT sensor is ok, then it is oil cooler time.
You probably do NOT need a BulletProofDiesel oil cooler, even though they are nice to have! Most people do just fine, even when towing, with the upgraded OEM one (from a source that is guaranteed to supply the OEM cooler).
If the EOT sensor is ok, then it is oil cooler time.
You probably do NOT need a BulletProofDiesel oil cooler, even though they are nice to have! Most people do just fine, even when towing, with the upgraded OEM one (from a source that is guaranteed to supply the OEM cooler).
Laughing Gas
Joined: Aug 2010
Posts: 1,049
Likes: 230
From: Amarillo, TX
I have the 7.3 fan clutch mod as well. I never see deltas get worse than 12. Most of the time my ECT runs 190-196 & EOT about 10* hotter. I will back off the throttle if I see EOT's go over 220.
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Fleet Owner
Joined: Nov 2003
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The fan clutch is for coolant temperature. The oil temperature to coolant temperature differential is "essentially" independent of the coolant temperature.
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Logistics Pro
Joined: Jul 2014
Posts: 4,673
Likes: 531
From: Houston, Texas
Dang, I tow all the time, over the Rockies and Appalachians, and have never seen temps over 235, and that only once. However, I monitor it constantly and slow down to a crawl if necessary to keep them low. And, I never drive 75, usually 55-60. I seem to have good luck keeping the RPMs around 1800, which can mean speeds as low at 30mph on long steep pulls. Ambient temps make a big difference.
Odd that your TFT has never gone over 184 - I've been above 210 a couple of times. It seems to rise in parallel with ECT, which makes sense.
Odd that your TFT has never gone over 184 - I've been above 210 a couple of times. It seems to rise in parallel with ECT, which makes sense.
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
Back flush the oil cooler before replacing it! Mine was off 26° when i bought it in 2018, backflushed, did the acid with VC9, CLR in it, followed by tap water, then distilled, then straight ELC coolant. Now my deltas are 8° solo, 12° when towing. I installed a coolant filter. Change the filter every 6 months and all is good. Back flush first. Dont waste your money!
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
OP: Oil cooler is plugged. Don't bother with the BPD unless you really want to spend money, just flush and go with the OEM unit.
Highest TFT I've ever seen is about 195. When pulling long hills in the summer (100+F & 20+ mile hills) it's usually in the 180's. Towing in the flats or unloaded it's always 155-160 once warmed up. On those long, hot hills my ECT can get up to 220F and kick the stock fan into high speed and the ECT will bounce between 210-220 based on fan operation. EOT gets 230-235 which most say is too hot. But the trans doesn't get hot.
I'm guessing the E-series has a smaller trans cooler than the F-series.
My old '13 ecoboost would hit 230F TFT on the same hills until I got the larger OEM "Saudi Arabia Raptor" trans cooler which was 2x the size of the stocker. After that 210. I guess 230 is the point where you need to get worried but that made me a lot more comfortable. The 6R80 in that truck had a 195F thermostat.
Highest TFT I've ever seen is about 195. When pulling long hills in the summer (100+F & 20+ mile hills) it's usually in the 180's. Towing in the flats or unloaded it's always 155-160 once warmed up. On those long, hot hills my ECT can get up to 220F and kick the stock fan into high speed and the ECT will bounce between 210-220 based on fan operation. EOT gets 230-235 which most say is too hot. But the trans doesn't get hot.
I'm guessing the E-series has a smaller trans cooler than the F-series.
My old '13 ecoboost would hit 230F TFT on the same hills until I got the larger OEM "Saudi Arabia Raptor" trans cooler which was 2x the size of the stocker. After that 210. I guess 230 is the point where you need to get worried but that made me a lot more comfortable. The 6R80 in that truck had a 195F thermostat.
Logistics Pro
Joined: Jul 2014
Posts: 4,673
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From: Houston, Texas
Today, I saw 212 TFT in 80f ambient while stuck in traffic. Always goes up when I'm in slow traffic. MarkK said 220f is when to start worrying.
Also takes quite a while to cool back down. Haven't compared the cooler size to my truck...would a bigger cooler affect the ect performance by blocking more of the radiator?
Engine fan kicked on several times today too - light load, small hills, 80d Temps. Didn't expect that, but delta always stays <12d, and cools down quickly.
Always wonder when I read guys say the EOT stays under 200. It has to be pretty chilly out for mine to stay that low.
Also takes quite a while to cool back down. Haven't compared the cooler size to my truck...would a bigger cooler affect the ect performance by blocking more of the radiator?
Engine fan kicked on several times today too - light load, small hills, 80d Temps. Didn't expect that, but delta always stays <12d, and cools down quickly.
Always wonder when I read guys say the EOT stays under 200. It has to be pretty chilly out for mine to stay that low.
