Hey guys,

I've spent a few days reading as much as I can on the internet about my issue but I've run out of runway and need some advise. I picked up a '04 F150 5.4 with 105K miles. I purchased it with a known CEL on.

The only code during the inspection before I purchased it was P0022. Symptoms were the classic rough idle after oil gets up to temp and low on power. After a lot of research I replaced BOTH cam positioning sensors and BOTH cam CVT solenoids. I figured it was better to be safe as these were typically problem areas and are prone to issues. Note that I did a fresh oil change on the truck prior to putting in the new parts.

After the parts replacement I cleared the codes using an OBDII scanner, ran it for a drive and within 20 minutes the issues were back. Rough idle, low power.

I checked the codes and I'm getting the following now:

P0022
P0300
P0316
P0340

After a visual inspection I can't find/hear/see any vacuum leaks. The oil pressure is great. I'm after more research I'm thinking it may be:

1. Plugged Catalytic converter
2. Bad Cam Phasers
3. Cam phasers jumped a tooth

So, I need your guys help. How do I diagnose the problem without spending major $$$ with replacements guessing what is wrong? I'm not thrilled with the idea of dropping it at a dealership and getting a bill for $1,500+ to try and figure it out.

PS - I need to figure this out in the next 30 days because the truck is currently failing the state inspection.

 

PS -This is my first Ford truck after being a Chevy guy for the last 4 trucks