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Old 05-21-2012, 07:13 AM
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EOT all over the place

On a cold start, the ECT and EOT are within 1-2 degrees. As the ECT warms up, so does the EOT, just a little behind, 10-15 degrees. As the ECT gets to 190ish, lt levels off and the EOT sometimes gets to 190 then falls off to 170 or low 180's.

I have suspicion that my oil temp sender is bad, but the EOT and ECT are within 1-2 degrees on a cold start. Could the sender be bad still even though it starts out in spec?
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Old 05-21-2012, 07:23 AM
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check sensor for crud it will act as an insulator for the sensor making it react slowly change oil
water/fuel in oil?
does it still happen after a long drive?(ect over 200*)
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Old 05-21-2012, 07:33 AM
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subscribed, having same problem with mine.
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Old 05-21-2012, 08:02 AM
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Quote:
Originally Posted by timfast77 View Post
check sensor for crud it will act as an insulator for the sensor making it react slowly change oil
water/fuel in oil?
does it still happen after a long drive?(ect over 200*)
I am coming up on an oil change...what's the proper method to check for fuel/water in the oil?

I don't drive very long to work, 20-25 minutes. I may get a chance to get out this weekend for a run to my brother in law's which is 140 miles away.
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Old 05-21-2012, 04:01 PM
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you can smell the dipstick or in the fill cap for fuel and look for creamy residue on cap if water, the best way is to have analisis somewere.
i would suspect both to be present in your oil as it doesnt get hot long enough to boil off water and short runs dilute with fuel
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Old 05-24-2012, 04:08 AM
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I had the truck running for over 4 hours yesterday without shutting it down. ECT was 193-199 and EOT got up to meet the ECT once in a while, but never went higher than the ECT.
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Old 05-24-2012, 04:53 AM
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did you check for dirty sensor first?
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Old 05-24-2012, 05:24 AM
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No, I left work(no tools) and drove around with my 3 year old looking at new vehicles with the wife. I left it idling for 10-15 minutes multiple times.

I know I have a a couple of issues going on...I recently did an EGR delete and the occassional mosquito fogging has subsided. The EOT was jumping prior to this. I noticed a small amount of foam floating in the degas when I stopped to fuel up yesterday. This truck is fairly new to me, I've owned it less than a year, so I have no idea what the PO maintenance schedule was like.
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