Ok, so I bought a used 2007 F150, 5.4 with 102k miles. I drove it 13 miles off the lot and it crapped out.....cam phasers.

After 3 tries, the car lot finally got that problem solved. I picked the truck up and drove it 56 miles and this is where is still sits because my mechanic cant figure out what to try next.

So the cats were completely melted and clogged. Cleaned those out and welded them back up (yes, they are hollow). Changed all injectors, changed all plugs, changed fuel filter, cleaned MAF.

Now here is where it gets tricky....you ready?

Throwing codes P0451 for the evap emission control system, and codes P2198 and P2196 for the o2 sensors.

Replaced the o2 sensors tonight and reset the codes, AND THEY ARE STILL READING BAD!

What is causing this? Bad ECM? Im at my wits end with this truck. Suggestions appreciated!

 

Cats are not hollow. That dealership by federal law cannot install an altered catalytic converter on your truck. Make them put OEM cats back on your truck.

Stewart

 

The dealer has done none of these repairs, and yes, the cats are hollowed out. Lets imagine for the time being that this is an off-road truck. Would the cats being hollow effect the way it is running?

Forgot to add: It runs fantastic during open loop, but as soon as it hits closed loop it goes to crap.

 

Yes, THAT part was clear.

However....

That part wasn't clear. You never said you did the repairs, so because "the car lot finally got that problem solved" (the cam phasers), the way your post read, the car lot did the other repairs too.

Specificity and clarity helps when you're describing what happened!

Lack of a catalytic converter, whether because of a long tube header, removed and straight piped, or gutted, will affect the downstream 02 sensors and will cause driveability problems.

Yep, that's because you gutted the cats.

Open loop fueling is off of the MAF and the fueling tables. It's my understanding that's a timed event until the vehicle goes into closed loop, at which time the fueling is controlled by the 02 sensors.

For your evap control DTC, check your gas cap and make sure it's sealing properly.

Stewart

 

Thanks. I ordered the new cats for it, and they should be in by Monday. I will update the thread on how it runs after they are installed.

 

OEM?

Stewart

 

They are Magnaflow OE grade. Not direct fit. Will this make a difference?

 

They are MagnaFlow OE. Not direct fit. Will this make a difference?

 

Quick question to OP. Did the cam phasers just pop. Or did the truck sound like crap when you payed for it??

 

I test drove the truck and it was fine, then I went back and paid for the truck, drove it 13 miles and then it went to crap. Why do you ask?

 

I got a 2004 a couple of weeks ago and it had a slight tick. I flushed the engine and put new oil in and it fixed the tick. I was just wandering how long it takes for phasers to crap out.

 

The tick might be a bad injector.

There is not set time for the phasers to go bad. Once they start going bad, they just go.....which is what im finding out.

Had mine towed to the garage today and had the cats put on. shop said the fuel pump control module was bad. They had the truck running fine and then it got hot and crapped out again. They are diagnosing it again.

 

My tick was comming from the bottom of the motor sounded like. The injectors sounded fine. Still not sure what it was. The Chevy dealer I got it from might have put the wrong weight oil in. It had a AC Delco filter on.. so I think that was the problem lol.
I flushed the motor and put Motorcraft filter and oil in. Also ran a can of seafoam through the tank with a new fuel filter. Sounds new now.

 

it's the cats. the O2 sensors are ignored while in open loop and the PCM fuels the motor based on tables

once you go closed loop, the PCM uses O2 sensor input to finely tune the strategy. better performance and MPG's...in theory.


anyways, your cats aren't doing the job (because hollowed out) and/or the aftermarket cats aren't up to snuff. again, this pisses the O2 sensors off and causes issues with the PCM.





you can fix this 2 ways:

 

Actually, it turned out to be a bad computer. Before I had the cats installed, I verified with Magnaflow, with a Ford tech, and with the service garage I was using to install them, that there would be no issue. They all said they should work fine.

When the truck did the exact same thing, the garage flashed the computer and reprogrammed it. It ran fine and then dropped the program. Computer will be in on Monday.

I do appreciate the advice though. I may end up buying a tuner. Any recommendations on brand?