EOT and ECT???
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Senior User
Joined: Jul 2010
Posts: 492
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EOT and ECT???
Well installed my Scan gauge II the other day and took a nice long ride...400+ miles.. It was cooler than usual outside around 64-65*F... Noticed that the ECT was around 173*F and the EOT was about 180-184*F at around 65-70 MPH... But when I accelerated to lets say 80-85 for about 30 miles the oil temp really didnt change(180 -184*F) but the ECT when up to around 180-184*F... I find it starnge that when the truck is worked the gap between eot and ect drops to almost 4*F but when just cruising around it has such a large fluctuation??? Any thoughts..
Is there a bypass that keeps the coolant from cooling the oil to much during cold operation.. Thanks in advance
Is there a bypass that keeps the coolant from cooling the oil to much during cold operation.. Thanks in advance
Senior User
Joined: Jul 2007
Posts: 233
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From: central valley, CA
Mine is doing the same thing when it is cooler outside. @75F got 184-190 ECT and EOT was steady @208. Then yesterday during the day it was 100F and the EOT was 195-197 and EOT was steady at 199 to 200. WTF? EOT was actually cooler when its hotter outside. This moring it was 73F and my ECT was 184 and EOT was 202. I got a recommendation in another thread to change the t-stat.
Senior User
Joined: Jul 2007
Posts: 233
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From: central valley, CA
I agree. I also read in another thread that another scangauge use had switched the programing to a pre 04 sensor code on the scangauge cause his readings were off. He did not use the code on the website. moebdick posted these settings.
TXD: 07E0221310
RXF: 046205130610
RXD: 3010
MTH: 000901F4FFD8
NAM: EOT
I use xgauge ver 3.15. What are you using?
TXD: 07E0221310
RXF: 046205130610
RXD: 3010
MTH: 000901F4FFD8
NAM: EOT
I use xgauge ver 3.15. What are you using?
Token Redneck
Joined: Jun 2007
Posts: 9,339
Likes: 350
From: Breckenridge, TX
ECT consistently under 190 means the t-stat is opening early or sticking open and not letting the coolant get up to 190*
Could be when the t-stat is stuck open the convection is screwy and flow is inconsistent. The coolant throught the oil cooler isn't flowing as fast, meaning hotter coolant hangs around longer, not drawing off as much heat, and increasing EOT.
Could be when the t-stat is stuck open the convection is screwy and flow is inconsistent. The coolant throught the oil cooler isn't flowing as fast, meaning hotter coolant hangs around longer, not drawing off as much heat, and increasing EOT.
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Senior User
Joined: Jul 2010
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I understand what your saying but how does it
Explain that it seems to cool better the hotter it gets....thought it might have been like the oil cooler in my vette.... that bypassed unrolled the engine reaches operating temp...
Explain that it seems to cool better the hotter it gets....thought it might have been like the oil cooler in my vette.... that bypassed unrolled the engine reaches operating temp...
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Post Fiend
Joined: Jul 2005
Posts: 6,127
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I had a stuck thermostat --- and it opened and stuck causing the ECT to get far too cold on the highway.
However, after a bit of exercising ( the car sat for a long time), the stickiness resolved itself.
However, after a bit of exercising ( the car sat for a long time), the stickiness resolved itself.
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Fleet Owner
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The oil is heated by energy created from friction. This doesn't increase dramatically from 70 to 85 mph. The heat from combustion does increase quickly (which heats the coolant more quickly than the oil will be heated). Also, the oil temps always "lag" the coolant temps, so you will always see some of what you describe. Remember 4 and 1/2 gallons of oil takes awhile to heat up.
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Senior User
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So you would say that its normal to have a wide 10 to 12* difference between eot and extra just tooling around but under load the margin would drop to 4 or 6*...I do remembers reading somewhere that in order to get accurate rot and extra spread the ect should be above 189*... is this correct...
Post Fiend
Joined: Jul 2005
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Part of the issue is where the sensors are and what reading they are getting.
See this thread:
https://www.ford-trucks.com/forums/9...hing-else.html
Oil temp sensor beside the filter mean the oil has already "cooled" by the sump, and heat is also lost via the pickup, pump, and pipe before it gets up to the oil filter / cooler.
If you measured oil temperature at spots known to be "hot" you will get different readings.
See this thread:
https://www.ford-trucks.com/forums/9...hing-else.html
Oil temp sensor beside the filter mean the oil has already "cooled" by the sump, and heat is also lost via the pickup, pump, and pipe before it gets up to the oil filter / cooler.
If you measured oil temperature at spots known to be "hot" you will get different readings.
Fleet Owner
Joined: Nov 2003
Posts: 27,915
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So you would say that its normal to have a wide 10 to 12* difference between eot and extra just tooling around but under load the margin would drop to 4 or 6*...I do remembers reading somewhere that in order to get accurate rot and extra spread the ect should be above 189*... is this correct...
