EOT/ ECT Large Differential
Senior User
Joined: Jul 2010
Posts: 492
Likes: 2
Are you just going by the Scan Gauge or did the dealer verify the reading with there computer... Reason I ask is I have noticed some strange readings with different scan tools...First my Mac scanner reported a 40* difference between ECT and EOT... Dealer hooked up there computer and only showed me a 6- 8* degree difference at its highest...My scan guage shows a 8-10 degree difference at its highest...Three different scanners 3 different readings.....but will go with the dealers readings and the scan gauge was only off by 1-2 degrees....Also what are the chances that the EOT sensor could be off on the high end ... I mean cold it could be fine but as it warms up the resistance changes and shows a higher than normal reading....
Elder User
Joined: Sep 2004
Posts: 821
Likes: 1
From: Nashville
Can you rule out a bad thermostat brand new out of the box?
Or the wrong one?
Or it installed backwards?
Or the wrong one?
Or it installed backwards?
Hotshot
Joined: Aug 2006
Posts: 17,399
Likes: 318
From: Whittier, CA
Over the Summer, Oil Cooler failed on my 2003 F-250 4X4, 126K miles. Replaced it with OEM Cooler, Flushed the radiator, changed the waterpump. Was still seeing a high EOT/ECT differential, and truck runs great.
So in an effort to cure the problem with many folks including the dealership, giving me good advice I changed the EGR and temp sensor. Again OEM.
So in an effort to cure the problem with many folks including the dealership, giving me good advice I changed the EGR and temp sensor. Again OEM.
Reading this again, it is not clear to me that you changed the EGR cooler.
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
Now that is a great point...
Thread Starter
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Junior User
Joined: Mar 2010
Posts: 66
Likes: 0
I replaced the oil cooler, when the cooler blew. water pump and themostat at the same time. After I finished I took it to Ford for the diag and they told me to change the egr to correct the temp differential. I did it, no change. So last thing I did was change the EOT sensor.
and the thermostat I put in can only go one way..
and the thermostat I put in can only go one way..
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
OK, assuming you did all of that right....
And assuming the diag readings are correct --- can you have a coolant blockage somewhere?
And assuming the diag readings are correct --- can you have a coolant blockage somewhere?
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Hotshot
Joined: Aug 2006
Posts: 17,399
Likes: 318
From: Whittier, CA
TampaDave, you may not be following me. Did you change the EGR cooler? Not the EGR valve, but the cooler?
Your coolant path is in series, through the oil cooler first, then through the EGR cooler. If either of those coolers is restricted, the coolant flow will be blocked.
This seems like a long shot, because a competent dealer tech should know to always change out both coolers. But when the obvious does not add up we have to start looking at the less obvious. Who did the work?
Your coolant path is in series, through the oil cooler first, then through the EGR cooler. If either of those coolers is restricted, the coolant flow will be blocked.
This seems like a long shot, because a competent dealer tech should know to always change out both coolers. But when the obvious does not add up we have to start looking at the less obvious. Who did the work?
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Junior User
Joined: Mar 2010
Posts: 66
Likes: 0
ok,, and my egr cooler looks like the bottom picture. I did take the egr valve out and cleaned it.
The new egr cooler matched the one I took out. So, summary, since July, I changed in order, Oil Cooler, Thermostat, waterpump (dealer changed), oil temp sensor, egr cooler.
On the themostat,, I change it a couple times because I took it apart so I could properly do the radiator flush when I cleaned the oil from the radiator, when the oil cooler failed.
And YES I am tired of working on this....
The new egr cooler matched the one I took out. So, summary, since July, I changed in order, Oil Cooler, Thermostat, waterpump (dealer changed), oil temp sensor, egr cooler.
On the themostat,, I change it a couple times because I took it apart so I could properly do the radiator flush when I cleaned the oil from the radiator, when the oil cooler failed.
And YES I am tired of working on this....
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Junior User
Joined: Mar 2010
Posts: 66
Likes: 0
I was going to add the external coolant filter, but I am clueless on how to check the coolant system for blockage, especially knowing that the coolant temperatures never get out of the normal operating ranges.
Other than putting in the cooler filter is there anything else you would do??
Other than putting in the cooler filter is there anything else you would do??
Post Fiend
Joined: Jul 2005
Posts: 6,127
Likes: 6
Dave,
Here is where you need a real tech who have done it to talk to you.
If I were doing it... i would find a way of pumping coolant without the engine running and then seeing if it is flowing properly...
This is a tougher problem than I can solve, bud.
Here is where you need a real tech who have done it to talk to you.
If I were doing it... i would find a way of pumping coolant without the engine running and then seeing if it is flowing properly...
This is a tougher problem than I can solve, bud.
Hotshot
Joined: Aug 2006
Posts: 17,399
Likes: 318
From: Whittier, CA
I have exhausted ideas as well. I was sure we were on to something with the EGR cooler, but now we know you changed it. I do not know any way to test the flow through the circuit.
So we are back to installing the coolant filter, running it for a while, and then checking it for crud. The idea being, that if it plugs up quickly, on a freshly flushed system, then it is likely that the oil cooler has been collecting crud too.
It is probably time to get it to an expert tech, who has the tools and knowledge to get to the bottom of it. I wish you luck, and hope you will keep us informed. I for one am very interested in what is wrong.
So we are back to installing the coolant filter, running it for a while, and then checking it for crud. The idea being, that if it plugs up quickly, on a freshly flushed system, then it is likely that the oil cooler has been collecting crud too.
It is probably time to get it to an expert tech, who has the tools and knowledge to get to the bottom of it. I wish you luck, and hope you will keep us informed. I for one am very interested in what is wrong.