Sudden loss of hp and bad fuel mileage - Ford Powerstroke Diesel Forum
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Old 09-06-2013, 05:28 PM
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Sudden loss of hp and bad fuel mileage

Hey guys im not really sure where to start, but basically over the past week or so i have noticed my truck has slightly lower power and is getting very bad gas mileage where as before it was doing awsome. The lack of power i am judging by it used to be able to burn out very easily when pushing it from a slow roll and now it cant spin a tire. Also when on the highway it now has trouble holding speed and when getting it back up to speed i feel i have to push the pedal harder then normal. Gas mileage is so bad it has to have been cut in half or more. I have done a few things to the truck in the past month and im not sure when all this started exactly. First thing i did was i had to replace the water pump as it went out on me and started leaking like crazy. Next thing i did to the truck was install a stack. I also put on 6.4 banjo bolts while i was in there. I cant see how any of these would hurt me power wise but thats all i have done. Any idea's? It is coming time for a oil / fuel filter change could this be doing anything? Thanks

Last edited by trab; 09-06-2013 at 05:59 PM.
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Old 09-06-2013, 05:30 PM
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Do you have any boost? Is it smoking? How does it idle?

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Old 09-06-2013, 05:32 PM
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First of all, you got to get rid of the stack, they rob tons of power just kidding. Any DTC's? Did you remove any of the intercooler tubes during the water pump job? Check your intercooler boots.
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Old 09-06-2013, 05:45 PM
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O i forgot to mention a few thing. I sometimes footbrake the truck at a stop and give it gas just to give a little smoke show, well i did this last week and yesterday and the truck died both times. Started back up afterwards just like normal and also i have been getting a code for a p0275(cylinder 5 contribution/balance). But ive been getting that code for about 6 months now... Yes i did acually did remove some intercooler piping while doing the water pump, and on the first test drive it blew the lower driver side one off. But i put it back on of course and it held fine after that, but i just checked it again tonight just to be sure and its still fine. I dont have a boost guage, but yes i can feel it boosting, how much im not sure. It idles perfect and no smoke other then when i push on it i get the normal black smoke.

Last edited by trab; 09-06-2013 at 05:48 PM.
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Old 09-06-2013, 06:11 PM
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Could be a dying FICM which may be killing injectors as well.
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Old 09-06-2013, 06:16 PM
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If you have a DTC, you should follow that clue. Check your ficm voltage.
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Old 09-07-2013, 04:21 AM
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Ok i will check the FICM voltage today and try to order a new injector for it. I did think about my problems last night and the fuel milleage problem really didnt start until very recently, the last thing i did to the truck was i pulled the EGR valve and cleaned it out. Wasnt really to dirty just sooty really. Think i could have screwed up something there?
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Old 09-10-2013, 04:44 AM
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I haven't gotten around to looking at the ficm yet but i believe ive found my problem. I did a fuel filter change and the shaft that the upper filter goes on was broken and stuck inside my filter. I ordered another assembly. But since taking out the broken part my fuel mileage is back to normal.
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Old 09-14-2013, 11:34 AM
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I replaced the broken valve in the fuel filter bowl, not sure what it was called. But the truck is back to normal.
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Old 09-14-2013, 11:35 AM
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Quote:
Originally Posted by trab View Post
I replaced the broken valve in the fuel filter bowl, not sure what it was called. But the truck is back to normal.
:thumbup:

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