ChrisC

I have an 04 Ford F150 FX4 SuperCrew, its had the spark plugs changed at 131k miles. It has 5.4L 3V Triton V8. Its had the fuel filter changed at 126k. For some odd reason I am getting an engine code "System to Lean Bank 2" I have it hooked up to a gensis's computer and that is the only code that shows, that and a catalytic deficiency code, but that is just because of the lean code. Which leads me to the next thing. When the truck is started mainly during colder weather it seems, but it does happen during warm weather to 50+, you can get in it start it up, drive it about a half mile, and by the time I make it to a light the idle is surging a bit, and the truck when you take off is spitting and sputtering like its being robbed of fuel, and the engine light flashes.

After it warms up, it goes away. The truck is still a bit sluggish as far as power goes but it does okay. Once I even cleared the engine code. Drove it 30-40 miles after it had warmed up. On the way back from that trip, the engine light came on for no reason. The truck wasn't doing nothing out of the ordinary. It was running fine. My thing is since its one side. What is it that is causing this? I've ran seafoam through it, I've ran fuel injector cleaner through it, I've had a machine hooked up to it that cleans the injectors. I really don't want to start throwing parts at it. I have had the catalytic converter checked. It was fine. The rear O2 Sensor is fine, its just reading the lean code. I am at a loss what this could be. If someone could chime in and help me I'd appreciate it. I am new to this forum. I was at another forum but everyone there was an idiot so it seemed. So I came here after reading many knowledgeable post.

Thanks in advance.

kevhead75

I would do a search for the code you are getting. I am guessing it's a P017X code. There are alot of topics about these codes. Could be any number of things like, plugs, COPs, fuel system related and others. Have you cleaned the MAF or changed the air filter?
Your rear O2 sensors do not affect engine operation, they only measure cat. efficiency. Your front O2's could need replacing, especially with a 100k+ miles on them.
Kev

ChrisC

Found out my window seal is leaking, and its leaking onto my computer... causing several issues...

kevhead75

Glad you found it. That's the hard part.

scholar

Lean bank codes more then always either a. Dirty Maf sensor or a vacuum leak (the vacuum leak is more likely the cause)

ChrisC

We looked for a vacuum leak. Nothing. Like I said we have a gensis. By we I mean my Cousin whose a mechanic... Its an 8 thousand dollar computer, that literally tells everything. Its a must for working on these things. Its showing an Injector malfunction, and a coil malfunction, and all kinds of crap. My guess is the water is running down on the computer, and messing it up. We found it was leaking. However tomorrow I get it back, and he is going to clean the TB, and this time hes going to use the machine. I thought he had already done that but he hadn't. This machine runs off air and it connects to the fuel rail. It cleans the injectors... We ran a smoke machine on it today, and found out it had no leaks at all.

I just wouldn't of thought that the computer getting wet would really cause all this... but then again its only one side that is to lean, and everything is functioning as it should... Like I said if anyone else has any ideas besides this would only give one side a lean condition, let me know. Today when it rained is when the gensis showed all the different codes that didn't exist prior to raining, and it also ran like ***.. Which it hadn't been doing since it was warm outside... The injectors were showing the correct volts, and the coils all showed the correct volts... So I dk... His guess is the wind shield... I'll find out some more tomorrow on that.

ChrisC

Update. He drove it after a good rain. It ran like ****. The computer showed high voltage to ground, and several other codes. He could clearly hear water sloshing around under the dash.... The carpet isn't getting wet so its gotta be a seal some where else. Any help on this it would be great.