ECT 183 EOT 208 FICM 29 ? - Ford Powerstroke Diesel Forum
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Old 11-25-2012, 02:50 AM
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ECT 183 EOT 208 FICM 29 ?

I am trying to help my brother with his truck, and hoping I can use mine to eliminate a few possibilities like the reader not reading right.

My truck is a 2003 6.0, my brothers is a 2005 6.0. I recently purchased the torque app and 2 OBD II readers (one to keep in each vehicle) to check our temps.

Mine recently had a lot of work EGR delete, coolant flush, new oil cooler, studded. Mine with reader reads 181.5 ECT and 180.5 EOT, so if feel those readings are probably reading right on reader. My FICM Main power reads 48 Volts so I think that is probably close to.

What concerns me is his reads 183 ECT and 208 EOT on a basic 10 mile drive at about 55 mph after the temps stopped climbing. We were not towing anything. His truck has had the EGR Delete also after having EGR either cleaned or replaced twice, but no cooler work.

I don't know if one has anything to do with the other, but his FICM voltage seems off too. When I read his truck I get 29 on FICM when starting cold, after it warms up a while it finally makes it to 42 volts. He notices FICM voltage drops when he accelerates, I'm guessing the injectors are drawing more power and the FICM can't keep up supply, I really don't know. It has a solid 13.5 FICM LVOLT in. I have been reading on these a lot and some suggest it is cold solder joints in FICM.


Thanks for any help, he really doesn't know where to start and I mentioned I have read that either problem could lead to more expensive repairs if not taken care of now. I think I read a bad FICM can take out your injectors, and High EOT can cause head gaskets to blow. I don't even know what are acceptable temps or voltages for certain as there is a lot of information out there to digest.

Last edited by Paul2000; 11-25-2012 at 03:23 AM.
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Old 11-25-2012, 05:06 AM
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For temps depending on the ambient air temps you are both reading lower than normal coolant temps you may need new thermostats the thermostat is designed to open at 190 to 195 deg.F The delta should be no more than 15 deg.F [the difference between the ect and eot] Eot should always be higher than ect. The coolant is supposed to cool the oil not the oil cooling the coolant.

Greater than a 15 deg. delta is a sign of a restricted oil cooler. Your brothers is restricted
You will need to do a coolant flush and probably replace his oil cooler.

I would also recomend putting a coolant filter on both trucks.
By the way all readings are dependant on the accuracy of what you are reading with.

Sorry forgot about the FICM your brothers is toast you can get it repaired at ficm repair.com and yes low voltages can take out injectors.

Last edited by dannyboy950; 11-25-2012 at 05:10 AM. Reason: Forgot about ficm
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Old 11-25-2012, 07:10 AM
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I agree with dannyboy, buy I think you should read both trucks temp readings after a cold soak, your temp sensor (s) may be bad, eot's are never lower than ect, almost impossible. Coolant filters are a must.

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Old 11-25-2012, 07:12 AM
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Here read this.....Write Up: Monitoring the 6.0L PSD.

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Old 11-25-2012, 07:35 AM
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^^^^ what they said, if you wondering what a cold soak is: left overnight and compare the ect-eot temps, should be the same +or- a degree.
And southend is right about the oil cooler temps not possible for the oil to be lower than crankcase temps unless you have a external oil cooler.
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