EOT/ECT

[harley520]

I just got my scangauge today so i wanted to see what all of my readings were. My EOT was 206 and my ECT was 186, ficm voltage stayed at 48.0 and my battery volts were 14.0 and my trans temp was at 148. Does anyone know why my ECT would stay so low?

[kjdowning18]

My ect never goes above 186 but the highest I have seen my eot is 199 usually at 195-6.... I was told to replace my tstat

[ryan.sampson]

I don't want to be the one to say it... and somebody correct me if i'm wrong but:

you ect is within its normal, correctly operating range. the oil cooler's job is to, obviously cool the oil. It does this by matching the oil temp to the coolant temp. if your oil cooler is junk, the difference between the 2 will be 15 degrees or greater, and your right at 20.

If it is the oil cooler, i would suggest fixing asap. if your getting coolant into your oil, you could risk ruining your bearings in the lower end...

other signs that it failed would be oil in your coolant or coolant in your oil, but this has never happened to me so im not sure how obvious it would be.

its not a very difficult job, if you did your egr delete, you can do this, its directly below it

[HAM_RADIO_MAN]

t-stat looks like its going down hill along with your oil cooler. Did you take these reading going down the highway after the truck was fully warmed up?

[harley520]

these readings were after driving for 30 min, doing between 35 and 55 mph

[Six0~Stroker]

Your supposed to check it going 60-65 mph on a flat highway.
The numbers will change

Test again and post results

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[JMIV]

Highest I've seen my EOT was 199 and that was 90 mph plus on freeway taking wife to have a baby. Other than that 195-196 at 60 mph.

[Six0~Stroker]

Oil cooler is more then likely GOOD then...
Change thermostat

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[harley520]

I'll get out tomorrow and take it down the highway and let you guys know, thanks.

[rady2000]

So what would be your guys' guess if both ECT and EOT are running high at about 200-210? Going to get a coolant flush tomorrow...