05 F150 with the 5.4 has lost a ton of power and just runs horrible. Pulled the codes and wow, this is what came up.

PO171 Sys too lean Bank 1
PO174 " " Bank 2
PO175 " " Rich Bank 2
PO300 Random Misfire
PO303, 304, 305, 306, 307
PO316 Misfire occurred in the first 1000RPM's
PO430 Bank 2 Catalyst Efficiency below limit.

Cam Sensor
Crank Sensor
Full pump pressure

Where to start? Compression test? Help, thanks.

 

Looks like you have multiple injectors stuck open. Do not run the engine until you get it fixed or you run the risk of hydrolocking and bending a rod. If you have less than 120k miles Ford will cover the injectors and any related damage including the cat converter. To verify if it is an injector take the 4 bolts out holding the fuel rail down, pop all the injectors out of the intake leaving them attached to the rail, and cycle the key to run. If any injectors leak fuel then they are stuck open.

 

I will give it a shot. Truck has close to 200K miles on it. Just to cofirm I turn the key to just before engaging the starter?

 

Yep turn it to run

 

Thanks I will check it out.

 

If you don't find a leaking group of injectors, or even one leaking, pull the spark plugs, see if they are badly fowled/worn. Visually inspect the coils for heat damage/ cracks/corrosion/not having dielectric on them. A very close visual inspection can be very informative. If some look un-natural from the others they are. Take a compression test with plugs out.

 

Testing the injectors now. Truck has 103K miles. Compression was good on all cylinders-near 200 on each.

So Ford will still fix the truck if an injector is stuck open?

 

Yep, the injectors are covered for 10 years or 120k miles. They will also change the oil and replace the converter if a injector is stuck open.

 

Thanks. .