Serious Decrease in MPG
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Senior User
Joined: Aug 2003
Posts: 393
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Serious Decrease in MPG
When i bought my 04 FX4 last fall i was getting 18-19mpg and not im lucky to hit 16mpg wtf???? I have had the tranny rebuilt rear end reabuilt, cam phasers replaced, fuel filter changed every 15k and oil every 3-3500... Any Ideas>>???? 2004 FX4 believe 3.73 gears. super cab short.
Posting Guru
Joined: Aug 2007
Posts: 1,714
Likes: 1
From: Canton, IL
Have you towed anything recently, or had a different driver driving it for a week or two? The reason I ask is that these 2004 are very sensative to changes in driving style and will adapt power and performance to closely match what it thinks the drivers intentions are.
You drive like grandma, you get grandma power and performance. You drive like a wild man, it will rise to the occassion.
It's not a linear relationship to how much you push the go pedal down, but how fast you move the pedal, under what conditions, how long you hold it there, how fast you let off of it. Floor it, and let off fast, the computer asumes that you want quick accelereration, conversely, if you roll on and roll off the throttle, and slow down slowly, the computer delivers what it thinks you want, mild performance (that equals better MPGs by default).
You drive like grandma, you get grandma power and performance. You drive like a wild man, it will rise to the occassion.
It's not a linear relationship to how much you push the go pedal down, but how fast you move the pedal, under what conditions, how long you hold it there, how fast you let off of it. Floor it, and let off fast, the computer asumes that you want quick accelereration, conversely, if you roll on and roll off the throttle, and slow down slowly, the computer delivers what it thinks you want, mild performance (that equals better MPGs by default).
Elder User
Joined: Feb 2007
Posts: 866
Likes: 1
From: Michigan
I got the same truck and before I was getting 18-19 mpg with stock tires and some times with my bigger tires. Now Im lucky to get 16. I have been trying everything. I havent changed anything except oil. I clean the air filter though. Thinking I need to get my cam phasers replaced tough
Tuned
Joined: Jan 2005
Posts: 314
Likes: 16
From: northeast
Poor mpg/tranny replacement
Since my transmision was replaced my truck has lost about 1.5 mpg across the board. The transmision hesitates then shutters between 1 and second gear shifts. Sometimes when i hit it sounds like the motor is reving up fine, but truck does not pull like it should. I think it might need some reprograming. Tryed different settings with the edge but had no change. After you had your tranny replaced did your milage drop then.
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Elder User
Joined: Feb 2007
Posts: 866
Likes: 1
From: Michigan
I had a new trans put in around the begining of the year. I think my miles went down before it went out though.
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Freshman User
Joined: Sep 2009
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might have to pull & flush the tank if your filter is plugging that quickly. Only takes a couple gallons of bad gas.
If you don't take care of it the problem could get a lot more expensive, $650-850 for the fuel pump / fuel sending unit & labor.
If you don't take care of it the problem could get a lot more expensive, $650-850 for the fuel pump / fuel sending unit & labor.
Junior User
Joined: May 2008
Posts: 76
Likes: 0
From: Beavercreek, Ohio
If the fuel was that dirty, it would be a good idea to run some fuel injector cleaner in the engine too. My Ford dealer wanted to charge me $100 to clean the fuel injectors on my '06 4x4 and I did it myself for a whole lot less than that.
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