Rebuilt FICM bad MPG

[WestTexas]

Just had my FICM reparied by Ed and had him add the Atlas 40. It looks like I wasted $150. Don't really notice a difference and I am still getting really poor fuel mileage. 11.3 so far driving 65-70mph on the highway. What am I missing here? New filters all around and oil. Stock 2006 CC F-250 with just some plain ol A/T tires on.

[WarChild]

I would not say you wasted the money. Might be more accurate to ask if there is anything else wrong with your truck.

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[WestTexas]

That's why I asked what else I could be missing. It might not have been a waste but as of right now I see no difference it how it is running. My main concern is MPG, what could be the cause of such poor numbers.

[Powerstrokinva]

I too recently had ED@FICMrepair.com rebuild my module. Great turn around time by the way. I had them flash it with the Atlas 80 tune. Holy titty sprinkles the truck runs and drives 100% better! Not only does having a properly working FICM (I don't think it has been working correctly since I bought the truck) make it start and run better but the extra power makes it drive so much easier. I have been trying to calculate fuel mileage since the install (it's been about three weeks). My first tank seemed to go rather quickly. Now I'm sure a lot of that had to do with me raping it every chance I got enjoying my new found power but the mpgs seem to be increasing the longer I drive it. I recently went some 150 miles on a little more then a quarter tank (from the very, very full mark) on a highway drive. I would suggest driving it around for a few tanks before you start to worry about fuel mileage. Also I have seen other people post about sticking brakes causing high fuel consumption. Worth a check at least. Assuming all the regular engine mechanicals are in good working order.

[WestTexas]

Turn around time was 24 hours no problem with that at all just wish the Postal Service was a little quicker haha (without having to pay an arm and a leg). After driving my truck some more I am noticing a difference in the Atlas 40 now. Hopefully the MPGs will improve or I will find the culprit but as of now i'm stumped.

[Powerstrokinva]

OP- It's been a couple months now, how is it working out for you?

[WestTexas]

Eh.... Voltage hasn't ever dropped below 48.5 but other than that mileage has still stayed down and the tune is ok I guess. Happy with the general fix of it but as far as the tune, I probably wouldn't do it again. Just my opinion. People have mentioned other culprits but I can't find anything else that seems to be wrong or that could be causing the poor mileage.

[white59rt]

Originally Posted by WestTexas

Eh.... Voltage hasn't ever dropped below 48.5 but other than that mileage has still stayed down and the tune is ok I guess. Happy with the general fix of it but as far as the tune, I probably wouldn't do it again. Just my opinion. People have mentioned other culprits but I can't find anything else that seems to be wrong or that could be causing the poor mileage.

A bad injector, clogged oil cooler, dirty turbo vanes, dirty egr valve (if you still have it), tons of things could be wrong to keep mileage down.

Hope you get it figured out!

Todd

[onebadcoastie]

What was the reasoning behind sending Ed the FICM in the first place? Was it producing low voltage or were you expecting that to cure you MPG problem? Don't take that as me being harsh, I'm just curious as to what the truck is/was doing. Do you have a programmer on your truck and if so what tunes are you using? Higher horsepower tunes usually result in the best mpg's so there very well could be more to this than just the FICM.

[Tuscany]

A clogged oil cooler isn't going to effect fuel economy.