Mattloz

Hey guys I have a 2004 f150 5.4 xlt 4x4 with 163,500 miles and I bought it used last November (1 year ago) I read that this year model truck runs lean from factory and I read another post that the guy updated/ re flashed his computer due to the throttle body or something in that nature, but that not the point should I just update it to just to have the lates software that ford made for the 04-08 trucks and MAYBE it can give me a tad bit better mpg ( avg 11 miami city) I have no check engine lights nor had any in the last year or any engine related problems. So should I go forth on this and if anyone has experience this what was the outcome? Thanks

Mattloz

Ohh and maybe I'm going to buy a edge tuner but if I update my Ecu befor I get the tuner will the tuner still work

techrep

iTrader: (1)

there is no ECU up-date that I have heard about... there is a transmission re-flash to correct a lag in shifting ...

Mattloz

I was actually thinking about it if I were going to buy a tuner it's going to re flash the Ecu from factory setting so if there was a update and I get the tuner it's still going to change it so I think I'll just wait for the tuner I guess

lewissa81

The tuner will work whether you reflash your pcm or not. You can also adjust your shifting so you reflashing the trans wouldn't be needed.
If you do get a tuner, then decide to reflash the pcm, put the tuner back to stock first and you'll be fine.