EOT VS ECT on cold soak
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Logistics Pro
Joined: Mar 2010
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From: NC
EOT VS ECT on cold soak
I have been noticing my ECT and IAT2 temps are 2.8 degrees lower than what the EOT sensor says on a cold soak. Thinking the EOT sensor was faulty I replaced it with a new Motorcraft one. After cold soak last night I turned on the key and found the same 2.8 degree difference. I have not started the engine with the new sensor but I am wondering why the SGII is seeing the difference?
Lead Driver
Joined: May 2014
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From: Virginia Beach VA
EOT and ECT sensors are exactly the same sensor, swap them if you think they are faulty and if the issue follows, then the sensor is the issue. IAT2 is intake temp and 2.8 isn't that much considering one measures air intake temp and one measures water temp. Cold soak for 2.8 difference, OK.
I don't think that's an issue, just remember that when you compare the spread fully warmed up when checking oil cooler health, not a big deal IMO.
I don't think that's an issue, just remember that when you compare the spread fully warmed up when checking oil cooler health, not a big deal IMO.
Senior User
Joined: Jan 2004
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From: South of Tucson
The sensors/gauges can exhibit odd behavior. My Scan Gauge II ECT will jump from 188 to 190 and then back to 188, never will it display 189. They are cheap inexpensive and some what inexact sensors.
Lead Driver
Joined: May 2014
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From: Virginia Beach VA
Pregnancy tests?
Hotshot
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So you never heard someone say that they were almost pregnant? lol
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Lead Driver
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you could say that everytime. Lol
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Laughing Gas
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You forgot to multiply by 100 after dividing 2.8/200... it's 1.4%, not .014%.
Senior User
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From: Ohio
I believe the coolant side only registers every 2 degrees while the oil side does every degree. I could be wrong though...
Fleet Mechanic
Joined: Jul 2013
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From: 'Pitlock, Maine
From my experience it appears Scangauge uses increments of two for ect up to 190* and then one there after. Cold soak numbers will rarely be the exact same....oil is thicker than water so heat disperses slower than from water and on the other end of the spectrum oil also soaks heat slower. My point being that with the ambient temps ranging from cool to hot and back one is always a little ahead of the other. for a true cold soak the ambient would have to be constant over a long period and that never happens. Just an observation on my part.
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Logistics Pro
Joined: Mar 2010
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From: NC
The oil temperature is reading 2.8 degrees hotter. If the difference is engine cold that is not a big deal, my concern is that it is accurate with the engine fully warm. Also, the TFT reading is the same as the IAT2 and ECT temps when cold.