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2665 Views 22 Replies 7 Participants Last post by  GatorBaitR6
So what kinda ECT/EOT's y'all runnin...?
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mine runs around 190/193 when the truck gets warmed up
Last night the outside air temp. was 41 while I was driving, I couldn't get the ECT above 184 on the short trip home and the EOT was 193. I have noticed that same difference while pulling 15k down the road on hot days also. I am in the process of getting everything together to replace egr/oil coolers.
Hum, Im in CT so its cold as balls i usually run 182-184 ECT but my EOT stays around 94-97... :/?... Why is that...? (forgive the newb)
If your oil is 94-97F that is odd and perhaps indicates a bad sensor. If it is 194-197F with the coolant temps you have, you are okay - on the top side of the oil cooler efficiency 15 degree delta but colder weather may allow a larger delta. If your oil is 94-97C this is 201-207F and would indicate a bad oil cooler (and another odd situation of measuring temps by two standards). How are you measuring temperatures and pressures of the engine?

I have the SCT 8900... Is there anyway that I can try and narrow it down to something... If it was a bad cooler then wouldn't the temps be sky rocketed...?
If it was a bad sensor wouldn't it throw on the check engine light...?
If it's cold try running a winter front or a piece of cardboard to get the temps up. You could also try a new T-stat. My truck has always ran cold, and the two temps are much closer if my ECT is around 190.
But that doesn't explain an 80 degree delta between the two... Unless it's just because the losses to ambient being its always max 32 degrees causes the cooler outlet to be that low...
A bad sensor will set a code but may not set the CEL. The temperature difference is an indirect measure for oil cooler efficiency. The 15 degree difference is a change from an earlier 25 degree difference previously used where catastrophic failures occured more quickly than were acted upon (under warranty). Unfortunately there is no easy direct test of the oil cooler (perhaps other than a failed EGR cooler). Excessive debris in a coolant flush is a good indicator of a clogged oil cooler. Testing the condition of the coolant is an indirect way of identifying cooling system issues too. Low protection levels provide the gateway to accumulation of debris such as scale and corrosion both from acidic reaction and erosion by cavitation.

There is NO WAY your oil temperature remains below 100F. Even an air-to-liquid oil cooler such as the BPD oil cooler would allow engine oil to get above 100F just from simple friction.

But that doesn't explain an 80 degree delta between the two... Unless it's just because the losses to ambient being its always max 32 degrees causes the cooler outlet to be that low...
I know, I was just talking about your low coolant temps. The sensor obvously isn't reading the correct oil temp. I would replace it.
I saw in another post that the coolant should not be green as it is in typical gas engines... When I was messin around the other day and pulled a radiator hose the coolant running out was green... Do a distiller water flush... And replace?
Yeah it should not have green coolant. Do a search on here about coolant and you'll find more than you want to know about what coolant to use.
Haha that's where I initially saw the post... Yea there's way more then I wanna know... I would ask what coolant y'all recommend but I'll do a search... Y'all can reply with it if you want...
I agree there is no way... I am a mechanic for a submarine my main job is propulsion so I own all the oil systems and I'm used to way more... Obviously my truck ain't a submarine but from sure friction and block heat alone the temps should be way higher...
Green coolant doesn't mean it's wrong - although it is very likely wrong. If Premium Gold (yellow) is recharged with VC-8 (blue) a green colored coolant is the result. The VC-8 is the Motorcraft Recharge Package of nitrites that provides cavitation and corrosion inhibitors to the Premium Gold (G-05). Most likely though someone replaced with "universal" automotive coolant. Use of Accustrip or Fleetguard test strips will confirm whether there are sufficient nitrites in the coolant to provide adequate cooling system protection.

If you're reading 97 degree EOT when it's warmed up, what does it read when you first fire the truck up? After sitting all night it should be the same as the coolant.
I'll check tomorrow when I leave work and get back to u about the start up temp
Oil temp after all night sitting on my SCT 8900 reads a little warmer then burnt which is from 30-40... I think it's the sensor it's the only thing that makes sense..
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