ECT Question - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 09-23-2018, 09:11 AM Thread Starter
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ECT Question

Hey guys. New to diesel engines and the forum. I've been reading up on the site and have found lots of great info.

I bought a 2005 F-350 SD FX4 pickup . It is pretty clean with 109K on the odometer and no CEL. I borrowed a friends CTS2 and started monitoring for a few days. The truck is a second vehicle so I've only been driving it locally before I took it on the highway yesterday for a 20 min drive. I'd like an opinion on my findings so far:

1.) The highest I've seen the ECT get is 188.

2.) My test drive on the highway last night the delta was around 20 with ECT at 188 and EOT at 211. This morning I let the truck idle for awhile, drove it around to run some errands, came home and let it idle some more. ECT/EOT was 184/195. I'm in CT so temps have been around low 60s last couple of days.

I expected the ECT to get to 190+. I'd appreciate thoughts on numbers and next steps.
Thanks
Nick

2005 Ford F-350 Super Duty 4dr SuperCab XLT 4WD LB

Last edited by nicksorg; 09-23-2018 at 01:51 PM. Reason: Changed EOT to ECT
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post #2 of 13 Old 09-23-2018, 11:32 AM
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Most guys report 188-192 for ECT with an OEM t-stat, depending on ambient temps. I have an OEM t-stat and even when it's 30 degrees out, mine will still run at 190.

I'm assuming you meant to say ECT on #1?? If so, let the truck sit for 12+ hours, then before starting it, check ECT & EOT sensors - they should read within a degree of each other. If they aren't, use your Trans temp sensor as a reference to compare and see which one might be off (assuming your TFT sensor is good). If they do read right there with each other, you can try an oil cooler back flush that many on here have done successfully (do a search on here and you'll find the info). If that fails, you're probably looking at a oil cooler R&R.

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post #3 of 13 Old 09-23-2018, 01:30 PM
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Nick, I think those numbers look fine. My 04 usually runs 198/206 on the two temps on the flat. Climbing my 6 mile mountain road always puts me at 209/220 which is where my fan comes on for about 3-4 seconds.


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post #4 of 13 Old 09-23-2018, 01:52 PM Thread Starter
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Thanks guys. Yes, I meant to say ECT and revised it. I'll let the truck sit over night and compare the two values before starting.

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post #5 of 13 Old 09-23-2018, 04:27 PM
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If youre not even warming up to between 192-196, you likely need a thermostat. I would definitely start there.


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post #6 of 13 Old 09-24-2018, 04:05 AM Thread Starter
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I let the truck sit and checked the sensors this morning without starting:

ECT = Initially displayed 56 but would switch back and forth to 58
EOT = 58
TFT = 57

The ECT value was bouncing between the values of 56 and 58. Is that indicative of an issue with the ECT sensor?

Thanks
Nick

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post #7 of 13 Old 09-24-2018, 04:49 AM
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ECT and EOT sensors are the same so you can swap them for a test if you want. Sounds like you need a new T-stat though.

If you have one of those infrared heat guns, could take a shot of the engine and upper radiator hose to verify the temp readings, or just replace sensor and thermostat, they are right beside each other.

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post #8 of 13 Old 09-24-2018, 05:10 AM
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Quote:
Originally Posted by nicksorg View Post
I let the truck sit and checked the sensors this morning without starting:

ECT = Initially displayed 56 but would switch back and forth to 58
EOT = 58
TFT = 57

The ECT value was bouncing between the values of 56 and 58. Is that indicative of an issue with the ECT sensor?

Thanks
Nick
The PCM only outputs the ECT reading in 1C increments (1.8F). That's why it was jumping between 56 and 58. Sounds like your sensors are fine and not biased. What was the ambient temp?
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Last edited by G8orFord; 09-24-2018 at 05:12 AM. Reason: Originally quoted the wrong post.
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post #9 of 13 Old 09-24-2018, 05:49 AM Thread Starter
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G8or, that makes sense. The IAT was 56

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post #10 of 13 Old 09-24-2018, 05:51 AM
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It sounds like your sensors are fine.
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