Hello,
I recently bought a 2000 f250 XL with the 5.4l in it. I has very little driving power, and the power is starting to surge. The truck will slowly get up to speed and will reach roughly 75mph but nothing more. Also with towing i cannot reach 55mph. the engine light is on and is throwing a bank 1 lean run code.
Here's what i have done so far:
New spark plugs
New fuel filter
New fuel pump
2 New fuel injectors i believed were bad
2 new coils that i also believed to be bad
Checked for vacuum leaks
Cleaned throttle body
Cleaned mass air flow and air filter
changed one of the upstream 02 sensors

Im at a loss at this point, and have no clue what to do next. any help or suggestions would be greatly appreciated! thanks

 

You need a better scan tooll like AE so you can monitor whats goinh on. Have you checked your kitty to see if its not plugged up?

 

Yes had a friend check he cat and see if it was blocked, and it showed clear.

 

You obviously had no clue what to do when you started. What a waste of time and money!!

You will be a lot better off if you stop guessing and get the proper tools and TEST to see what is wrong!!!!

 

How many miles does this thing have on it? Running a compression test wouldn't be a bad idea.

 

180,000, I did , all cylinders between 118-125