HELP! 04 f150 issues
#1
HELP! 04 f150 issues
Ok so I have an 04 f150 with the 5.4 in it. It had been having running issues and its only gotten worse since working on it.
So what its doing:
barely idles at all. Seems like its missing on multiple cylinders but never throws a code. Idle is 500 rpm or under. It barely has enough power to get the truck moving......surges andmisses. Only two codes its throwing are bank 1 and 2 lean.
now what ive done:
Replaced all of the plugs with oem motorcraft. Replaced all of the coil boots. Fuel filter. And one bad coil. Replaced one bad upstream 02 sensor.The cats were totally plugged off so thats fixed as well. Fuel pressure koeo settled at about 50ish koer was 34. Reved the engine up to 3500rpm and fuel pressure never dropped lower than 34. Hung around 36 to 40 psi.
So whats the next step? Im about to drive this truck off a cliff.
So what its doing:
barely idles at all. Seems like its missing on multiple cylinders but never throws a code. Idle is 500 rpm or under. It barely has enough power to get the truck moving......surges andmisses. Only two codes its throwing are bank 1 and 2 lean.
now what ive done:
Replaced all of the plugs with oem motorcraft. Replaced all of the coil boots. Fuel filter. And one bad coil. Replaced one bad upstream 02 sensor.The cats were totally plugged off so thats fixed as well. Fuel pressure koeo settled at about 50ish koer was 34. Reved the engine up to 3500rpm and fuel pressure never dropped lower than 34. Hung around 36 to 40 psi.
So whats the next step? Im about to drive this truck off a cliff.
#3
having the same issue with mine, turns out there is a vaccum line on the back of the intake man that has blown off, a real PITA to get too, waiting of her to cool off and about to tackle the job, have to remove air system and fuel rail to maybe get back to it, mechanic told me at the dealership this is a common problem on these trucks and it fools a lot of people, try and get the line hooked back up with a zip tie on the collar. I will let you know later if this is the fix!
#4
having the same issue with mine, turns out there is a vaccum line on the back of the intake man that has blown off, a real PITA to get too, waiting of her to cool off and about to tackle the job, have to remove air system and fuel rail to maybe get back to it, mechanic told me at the dealership this is a common problem on these trucks and it fools a lot of people, try and get the line hooked back up with a zip tie on the collar. I will let you know later if this is the fix!
#7
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