erratic coolant temp readings - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 07-09-2012, 09:45 AM Thread Starter
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erratic coolant temp readings

i am monitoring vitals with an edge cts. as of lately my coolant temp has been acting a little funny. it will warm up like normal and oil temp will stay about 5-10 degrees behind ect up until 192. the the oil will steadily rise about 5-6 degrees above ect. then randomly ill look at the gauge and the ect will be at 174. it may sit like that for a min and then jump back up to normal temp, within 5-8 degrees of eot. eot will never fall like the ect. i have a new ford thermostat less than 6 months old, no coolant leaks, new oil cooler, coolant filter and elc coolant. my guess is a sensor since the eot stays pretty steady. never had a wrench light either and sometimes its stay 30 degrees different for a few minutes. what sensor does the gauge read? easy to change? any other thoughts as to what it could be? thanks

06 f350: 8" ICON 2.5 resi's, ouo ala's, pmf track bar, dual stabilizers, custom 5" exhaust, 37" BFG km2's, 4.30s, 08 tailgate w/step, 08 tail lights, coolant filter, BPB oil cooler w/p 58v ficm and radiator, ARPs, 175cc, MTW s1 billet, ported intake, egr delete, onboard air and gearhead tunes
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post #2 of 8 Old 07-09-2012, 01:01 PM
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I had a similar temp cycling once, but mine was the opposite. ECT would climb, then drop to normal and cycled like that about every minute. My issue was the impeller spun off the water pump shaft.

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This was just my experience. Good luck with your trouble shooting.

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post #3 of 8 Old 07-09-2012, 02:08 PM Thread Starter
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god i hope not. like i said before not rising just dropping.

06 f350: 8" ICON 2.5 resi's, ouo ala's, pmf track bar, dual stabilizers, custom 5" exhaust, 37" BFG km2's, 4.30s, 08 tailgate w/step, 08 tail lights, coolant filter, BPB oil cooler w/p 58v ficm and radiator, ARPs, 175cc, MTW s1 billet, ported intake, egr delete, onboard air and gearhead tunes
All the above just to haul the 900hp street mustang
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post #4 of 8 Old 07-09-2012, 04:09 PM
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Sounds like your thermostat is sticking open. try changing it out. its cheep and simple. if that doesnt work then I would start looking at the water pump. But it sound just like a sticking thermo to me. Good luck!

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post #5 of 8 Old 07-09-2012, 07:03 PM Thread Starter
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If it was the t-stat would the oil temps drop too? The ect affects the eot. Maybe it doesnt have enough time to affect it

06 f350: 8" ICON 2.5 resi's, ouo ala's, pmf track bar, dual stabilizers, custom 5" exhaust, 37" BFG km2's, 4.30s, 08 tailgate w/step, 08 tail lights, coolant filter, BPB oil cooler w/p 58v ficm and radiator, ARPs, 175cc, MTW s1 billet, ported intake, egr delete, onboard air and gearhead tunes
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post #6 of 8 Old 07-09-2012, 07:29 PM
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Not really at those temps.

White 04 F350 Lariat SRW/CC/LB/FX4 227,XXX+
Studs/BPD58V FICM Atlas40/BPD oil cooler/waterpump/7.3 fan
Edge insight CTS EGT/Turbo timer/FP SCT with ? Tune
Powermax w/KC billet wheel Warren 175/30%
5-8" MBRP Off Road Turbo Back/harpoon
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ELC/PMM Coolant filter
aFe Stage2/EGR Delete


Semper Fidelis (Always Faithful) is the motto of the Corps. That Marines have lived up to this motto is proved by the fact that there has never been a mutiny among U.S. Marines.
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post #7 of 8 Old 07-16-2012, 08:21 AM
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Had the same problem a few weaks ago and it was the temp sensor. pull the codes and see if it is a low output problem on the temp sensor. Have fun changing it if you need help you know where i live. I think you need a 21mm med. depth socket.
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post #8 of 8 Old 03-10-2015, 06:21 AM
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reviving an old thread here but what was the solution to your problem i am having the exact same issue and would like to correct it before any major issues arrive.


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