ECT/EOT cold soak vs. hot
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Posting Guru
Joined: Dec 2012
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From: SW Florida
ECT/EOT cold soak vs. hot
I'm curious....if our ECT and EOT are off a few degrees after a cold soak, will they be off when they are hot as well? For instance.....if ECT is 70 and EOT is 72 at cold start up, will the EOT read 2* higher than it's actual temperature when it's hot too?
Lead Driver
Joined: Jul 2004
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From: Foothills, CA
But in answer to your question if say after a day or two you saw 2 deg diff. and after several of these checks and it always was the same, I'd be in the camp that the reading is linear and will always be that far apart (plus any "true" delta).
my $.02
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Posting Guru
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From: SW Florida
Sometimes the truck will sit for a week and I'll notice the EOT is 2* higher than ECT before starting. I was thinking it would be linear too, but wasn't sure how someone would know..... or how to verify it.
Lead Driver
Joined: Oct 2010
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From: Ouray, CO
Assume the 2* delta is constant across the operating range! 
That gallon of milk actually has "more than" 1 gallon in it. Look at the 6-pack of drink bottles at the store - they are NOT "exactly" the same level they are approximately some value - and generally "at least" the amount they claim.
The speedometer is off by about 3 MPH at 70MPH (stock tire size), there is a voltage drop between the "battery" and my voltmeter - I have 2 batteries, and I never wonder how their voltages compare, I replace them in pairs.
What about the sign that says /your favorite city/ 33 miles? Where in /your favorite city/ is it measured to from? is it really 33.2 miles? or 32.8 miles? is it measured from where the sign is mounted? or where somebody with 20/20 vision can first read it traveling at the posted speed limit?
That gallon of milk actually has "more than" 1 gallon in it. Look at the 6-pack of drink bottles at the store - they are NOT "exactly" the same level they are approximately some value - and generally "at least" the amount they claim.
The speedometer is off by about 3 MPH at 70MPH (stock tire size), there is a voltage drop between the "battery" and my voltmeter - I have 2 batteries, and I never wonder how their voltages compare, I replace them in pairs.
What about the sign that says /your favorite city/ 33 miles? Where in /your favorite city/ is it measured to from? is it really 33.2 miles? or 32.8 miles? is it measured from where the sign is mounted? or where somebody with 20/20 vision can first read it traveling at the posted speed limit?
Hotshot
Joined: Jul 2005
Posts: 13,834
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From: Middle Tn.
Two degrees + or - is more than likely well within the accuracy range of the sensors. If the eot sensor if off -2 degrees and the eot is off +2 degrees you have a 4 degree spread and everything is still wthin tolerances. Hypothetically that is.
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westladog
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Jun 12, 2005 07:27 PM
