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post #1 of 11 Old 04-18-2011, 06:03 AM Thread Starter
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Question EOT/ECT Temperatures

I have installed an Edge Evolution CTS so now I can actually see my oil and coolant temperatures. Typically the run 6-8F degrees different. I have heard you want no more that 15F difference so I am guessing this is OK. My question is that my coolant in in the 183 F range and the oil is running in the 176F range. I thought the t-stat opened at 190F? Since my temperatures are cooler than this, am I actually getting good circulation? I have red coolant but am getting ready to change it out so I know what I have for sure (going with Cat ELC-1) and maintain a log of all fluid/filter changes. Since I have the system open I am also going to change out the t-stat and install a coolant system filter. Thx

2004 F250 Lariat/6.0L/SRW/Crewcab/Shortbed FX4
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post #2 of 11 Old 04-18-2011, 08:12 AM
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Something is definitely out of whack there. The EOT should be higher than the ECT. Yes I would say the thermostat is bad. It should begin opening at 192* and is fully open at 219*. How long are you running when you get these temps? It sounds like you are not getting the truck fully up to operating temp or the EOT would be higher. Either that or the Oil sender is bad.

Last edited by PGreenSVT; 04-18-2011 at 09:07 AM.
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post #3 of 11 Old 04-18-2011, 08:16 AM
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Quote:
Originally Posted by PGreenSVT View Post
Something is definitely out of whack there. The EOT should be higher than the EGT.
You mean ECT.

Since your oil cooler is cooled by coolant (sounds funny), your EOT should always read higher than your ECT.

My t-stat starts to open at about 185-187, and then quickly drops to 183 as well. Maybe time for a new t-stat?

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Last edited by mah77; 04-18-2011 at 08:20 AM.
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post #4 of 11 Old 04-18-2011, 09:09 AM
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Quote:
Originally Posted by mah77 View Post
You mean ECT.

Since your oil cooler is cooled by coolant (sounds funny), your EOT should always read higher than your ECT.

My t-stat starts to open at about 185-187, and then quickly drops to 183 as well. Maybe time for a new t-stat?

Fixed it. My fingers don't remotely go at the same speed as my brain.
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post #5 of 11 Old 04-18-2011, 05:23 PM Thread Starter
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Quote:
Originally Posted by PGreenSVT View Post
Something is definitely out of whack there. The EOT should be higher than the ECT. Yes I would say the thermostat is bad. It should begin opening at 192* and is fully open at 219*. How long are you running when you get these temps? It sounds like you are not getting the truck fully up to operating temp or the EOT would be higher. Either that or the Oil sender is bad.
I am going to do a full coolant change out within the next two weeks so will be adding a new t-stat to my list of things to do. I am picking up the Cat ELC-1, Restore and Restore plus tomorrow. I called around and found suppliers who had it. Since the ambient temperatures have been in the mid 30s/40s I have kept the block heater plugged in. My max. temperatures are obtained after about 10 minutes of driving. My typical drive is 15-20 miles plus stops. I will double check my temperatures again tomorrow as I will be driving over 100 miles by the time it is done. Many Thanks.

2004 F250 Lariat/6.0L/SRW/Crewcab/Shortbed FX4
EDGE Evolution CTS
Python 424 Remote Start
Volant Ram Air

RCD-EGR Delete
Cat/Muffler Delete
Rancho RS 5000 Shocks
6.4 Banjo Bolts
Throttle Plate Delete
4" Straight Pipe
Updated to "Blue" Fuel Pressure Spring
DIY Coolant Filter

Caterpillar EC-1 "RED"

"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." - Benjamin Franklin, 1759
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post #6 of 11 Old 04-18-2011, 05:53 PM
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Here is a link with normal, watch, and worry temps, both stock and tuned.


Recommended readings - Temperature and Pressure - Ford Truck Enthusiasts Forums

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post #7 of 11 Old 04-19-2011, 09:24 AM
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Quote:
Originally Posted by shiprek View Post
I am going to do a full coolant change out within the next two weeks so will be adding a new t-stat to my list of things to do. I am picking up the Cat ELC-1, Restore and Restore plus tomorrow. I called around and found suppliers who had it. Since the ambient temperatures have been in the mid 30s/40s I have kept the block heater plugged in. My max. temperatures are obtained after about 10 minutes of driving. My typical drive is 15-20 miles plus stops. I will double check my temperatures again tomorrow as I will be driving over 100 miles by the time it is done. Many Thanks.

Your truck isn't fully up to temp in 10 minutes. Let us know the temps when it's been running for 20-30 minutes.
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post #8 of 11 Old 04-19-2011, 09:31 AM
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Quote:
Originally Posted by PGreenSVT View Post
Fixed it. My fingers don't remotely go at the same speed as my brain.
The fingers are faster aren't they?

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post #9 of 11 Old 04-19-2011, 09:54 AM
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Originally Posted by dhanna6powerstroke View Post
The fingers are faster aren't they?
It seems so sometimes.
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post #10 of 11 Old 04-19-2011, 04:25 PM Thread Starter
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EOT/ECT

Quote:
Originally Posted by PGreenSVT View Post
Your truck isn't fully up to temp in 10 minutes. Let us know the temps when it's been running for 20-30 minutes.
I took the truck out today to pick up my Restore and Restore Plus. I put in excess of 100 miles, interstate driving. In my original email I was bass ackwards, I had my EOT and ECT reversed. At interstate speeds today I was looking at ECT of 183F +/- and my EOT was in the 193F +/- range. Sound Right? Coolant never got above 183??

BTW, the Restore did not come in so I will have to make another trip on Thursday. I did pick up the Cat EC-1 coolant so it was not a wasted trip.

2004 F250 Lariat/6.0L/SRW/Crewcab/Shortbed FX4
EDGE Evolution CTS
Python 424 Remote Start
Volant Ram Air

RCD-EGR Delete
Cat/Muffler Delete
Rancho RS 5000 Shocks
6.4 Banjo Bolts
Throttle Plate Delete
4" Straight Pipe
Updated to "Blue" Fuel Pressure Spring
DIY Coolant Filter

Caterpillar EC-1 "RED"

"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." - Benjamin Franklin, 1759
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