Lower ECT's and drop in MPG. - Ford Powerstroke Diesel Forum
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post #1 of 44 Old 09-29-2013, 07:32 PM Thread Starter
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Lower ECT's and drop in MPG.

Over the past week and a half my ECT's have been a bit lower than normal. It normally is around 186-190ish range. Now its 180-184. According to my insight my average mpg (i do mostly city driving) is 13. It has dropped down to 9. I am not missing coolant, and it is running fine. It has been getting colder, but not enough to affect my ECT temps. Am i just being paranoid?

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post #2 of 44 Old 09-29-2013, 08:13 PM
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Originally Posted by 6.boom View Post
Over the past week and a half my ECT's have been a bit lower than normal. It normally is around 186-190ish range. Now its 180-184. According to my insight my average mpg (i do mostly city driving) is 13. It has dropped down to 9. I am not missing coolant, and it is running fine. It has been getting colder, but not enough to affect my ECT temps. Am i just being paranoid?
Sounds like your thermostat is getting week, as in these trucks they fail open as a safeguard. Running around unloaded, ECT should be around 190 to 195f, where the thermostat begins to open. And engine temp is tied to fuel mileage - particularly with diesels. The ideal temp for diesel efficiency is 203f.

Also, some states may already be switching to winter blend diesel, so prepare for the annual 2 - 3 mpg drop to begin

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post #3 of 44 Old 09-30-2013, 06:14 AM Thread Starter
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Sounds like your thermostat is getting week, as in these trucks they fail open as a safeguard. Running around unloaded, ECT should be around 190 to 195f, where the thermostat begins to open. And engine temp is tied to fuel mileage - particularly with diesels. The ideal temp for diesel efficiency is 203f.

Also, some states may already be switching to winter blend diesel, so prepare for the annual 2 - 3 mpg drop to begin
Would my thermostat going bad cause just my readings to be off? Because my MPG doesn't seem like its getting 8-9, yet it reads like that. Sorry if thats a dumb question

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post #4 of 44 Old 09-30-2013, 06:38 AM
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Yes cold diesel's do not perform as well as efficiently. (just so you know that took 3 people to try to spell that word)

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post #5 of 44 Old 09-30-2013, 08:02 AM Thread Starter
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So since my thermostat is going bad, not only will the readings be off but the truck itself will not perform accordingly.

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post #6 of 44 Old 09-30-2013, 08:27 AM
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I don't think running 4-10*f cooler is going to result in 2-3 mpg loss. I'd check your hand calculated mpgs and go from their

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post #7 of 44 Old 10-01-2013, 09:22 AM
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I wish I saw a lower coolant temp. Mine needs a water pump its been heating up in traffic. Just need to find the time to do it.

I vote thermostat and the cooler weather coming in. Mpg loss can be different driving, fuel quality, injectors wearing out. Have you been getting fuel at the same place?


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post #8 of 44 Old 10-01-2013, 05:03 PM Thread Starter
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I wish I saw a lower coolant temp. Mine needs a water pump its been heating up in traffic. Just need to find the time to do it.

I vote thermostat and the cooler weather coming in. Mpg loss can be different driving, fuel quality, injectors wearing out. Have you been getting fuel at the same place?


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Oh gosh i hope its not my injectors. Yes I have been fueling up at the same places.

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post #9 of 44 Old 10-01-2013, 05:54 PM
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Keep us informed....

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post #10 of 44 Old 10-01-2013, 06:50 PM Thread Starter
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Keep us informed....
Will do! Thank you for the help

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