EOT vs ECT-Large Delta, but low ECT...? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 02-25-2015, 09:23 PM Thread Starter
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EOT vs ECT-Large Delta, but low ECT...?

I think I have this figured out, and I believe I've got a bum thermostat;

Owned the truck for a week, ambient temps range from 29 to 70 degrees. I have rarely seen the ECT reach 185, usually below or right at 180. Running fast freeway speeds without a trailer I'm seeing EOT of 180 and just kissing 200 briefly.

Momentarily I've seen 17-19 degree deltas, but again, EOT is still low and it would appear that the ECT aren't getting to temp.

Am I right? I hope?

Allen Dye
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post #2 of 11 (permalink) Old 02-25-2015, 11:30 PM
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Re: EOT vs ECT-Large Delta, but low ECT...?

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Originally Posted by CMRA 270 View Post
I think I have this figured out, and I believe I've got a bum thermostat;
When they fail they stick in the open position. The engine runs more efficiently when they work properly and you'll get better fuel mileage.

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post #3 of 11 (permalink) Old 02-26-2015, 12:50 AM
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Re: EOT vs ECT-Large Delta, but low ECT...?

If you have faith that your measuring instrument (?) is accurate, your thermostat is not complete up to par. And yes, it's a good idea to replace it.

As far as your EOT, yes, the delta is higher than it should be, but 200F EOT isn't really anything to be alarmed about, IMHO.

Personally, I would remove the thermostat, do an extensive coolant flush (including backflushing the oil cooler – heater core too while you're at it), replace the thermostat, refill with a good ELC coolant, and then see where you're at.

2004 F-250 Lariat, 6.0, SCLB, 4wd, Magnaflow turbo-back, EGR delete, studded, 6.4 banjo, new oil cooler and HPOP as of 5-11-2014
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post #4 of 11 (permalink) Old 02-26-2015, 12:27 PM Thread Starter
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Re: EOT vs ECT-Large Delta, but low ECT...?

Thanks for the advise!

Supposedly this truck just got studs, delete and a new cooler. The degas bottle was full of sludge...so I replaced it along with the T stat. ECT is normal now, and at cruising speeds it appears that the delta is 8-10 degree difference, with EOT at 200-202. Still not high.

I'm wondering if the cooler was actually replaced.

I'm using an SCT to measure temps. Both temps are a out equal after sitting over night, BUT they seem high vs ambient temps.

Allen Dye
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post #5 of 11 (permalink) Old 02-26-2015, 11:35 PM
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Re: EOT vs ECT-Large Delta, but low ECT...?

A 5 to 15 degree delta is considered acceptable and normal.

05 F350 cclb dually, egr delete, blue spring upgrade, coolant filter, cat and muffler delete, scanguage II
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post #6 of 11 (permalink) Old 02-27-2015, 01:42 PM Thread Starter
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Re: EOT vs ECT-Large Delta, but low ECT...?

Cool deal...I apologize for the paranoia...it's been a wonky transaction. The truck is a beast though...
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post #7 of 11 (permalink) Old 03-01-2015, 09:57 PM
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Re: EOT vs ECT-Large Delta, but low ECT...?

What kind of sludge was in the bottle?#?#

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post #8 of 11 (permalink) Old 03-03-2015, 11:39 PM Thread Starter
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Re: EOT vs ECT-Large Delta, but low ECT...?

Black sludge like...grossness. I'll post pics later, but clearly it had blown headgaskets or an oil cooler problem.

I bought the truck as bulletproofed from a local shop who does them; studs and a delete. The coolant was fresh, but I was surprised that the degas bottle didn't get replaced. It's cheap...I didn't mess with it and got it done. I'll be doing a coolant filter in the next week or so.
May also replace the sensors as after it sits over night, the EOT is a little over 2 degrees higher than the ECT.
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post #9 of 11 (permalink) Old 03-04-2015, 02:02 AM
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Re: EOT vs ECT-Large Delta, but low ECT...?

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Originally Posted by CMRA 270 View Post
the EOT is a little over 2 degrees higher than the ECT.
Mine is 2 degrees higher as well.

05 F350 cclb dually, egr delete, blue spring upgrade, coolant filter, cat and muffler delete, scanguage II
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post #10 of 11 (permalink) Old 03-05-2015, 03:07 PM Thread Starter
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Re: EOT vs ECT-Large Delta, but low ECT...?

That's interesting...they should be the same...I'm about to go out and see what it is now...hasn't been started since Saturday. It's 27 outside now.
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