WTF issues..............EOT & ECT - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 03-03-2013, 06:49 PM Thread Starter
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WTF issues..............EOT & ECT

Ok been awhile since ive been on here so Ill give details of the truck then what issues Im having.

2003 f250 4wd auto with Sinister EGR Delete, Straight 4" turbo back, SCT tuner.

Ok when its below 50*F outside and running heater truck has a hell of a time getting warm and gauge sits on cold mark. If pulling my 24' enclosed with my daughters jr dragster and mule it will get alittle warmer but not much. Also coolant seemed to be puking out of degas bottle so put a new cap on.

Now when about 70*F with A/C on truck will get to normal operating temps on highway.

Pulled codes and only thing I see is #2 injector is in need of replacing.

Pressurized cooling system to 20 psi and it held for 3 hours with no fluctuating.

Used the SCT and monitored the EOT and ECT and they ECT got up to 150*F today with A/C on and EOT was 212*F at same time.

My question is can I be having an issue with the oil cooler? Or is there another issue im not considering?

2009 Harley Crossbones
Has a few goodies but going under the knife soon!

2003 F-250 Quad Cab 4wd Auto 6.0 SCT 4" Turbo Back
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post #2 of 5 Old 03-03-2013, 08:59 PM
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Sounds like a stuck open thermostat and a failing oil cooler.

Normal ECT should be 192. If yours won't heat up, it is probably stuck open. Your ECT/EOT delta is not going to get any better when the coolant temperature goes up to normal (won't likely be any worse), but is is way high of a delta.

One thing to do first would be to check the ECT and EOT against the ambient air temperature after the truck has sat all night to be sure the sensors are giving you good info. I am suspicious of the ECT reading and the ECT/EOT delta of 62F. That may be a new record! Could just be a bad sensor....


2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
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post #3 of 5 Old 03-04-2013, 03:26 AM
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Yup gotta agree with that.

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post #4 of 5 Old 03-04-2013, 06:33 AM Rookie
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I have similar readings from a SG2, ect=188-192F but my eot is upwards of 215F and under some heavier loads can go to 225F. I performed a EGR delete on my 2003 6.0L about two years ago but only started to look at the operating numbers since I bought a scangauge.....Wouldn't the EGR delete lower the ECT since you are not sucking heat off the exhaust??.....The EGR delete literature stated it would lower egt which in turn would lower the ect....but I can't see that eot should really change if the heat exchange remains constant in the oil cooler??? This would create the unusually large delta.

Last edited by FarmerDave; 03-04-2013 at 06:36 AM.
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post #5 of 5 Old 03-04-2013, 06:40 AM
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oil cooler may be fine. without coolant circulating correctly the oil may not be getting cooled. replace the thermostat and go from there

07 F250 Lariat ECSB bed FX4 6.0
leveling kit
XD Strike 17x9 -24 offset 295/70/17 Hankook ATm
fox shocks & fox dual steering stabilizer kit
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EGR delete
SCT Livewire custom tuned
sinister diesel coolant filter kit
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