brentagade

So it's been a few weeks, but I thought I should give you all an update. The problem WAS the catalytic converter on the driver's side. I got in with a mechanic and he was troubleshooting the plugs, coils, and fuel injectors. They couldn't figure it out until he took it for a drive. Came back and dropped the cat. It was completely demolished inside. It came all apart and there was virtually no flow through. He put a new one on in the morning and that was it. It's been running great since. Of course it cost me twice as much since I already had replaced everything else first, but hey, I'm back on the road. Thanks for all the help.

So after driving the truck back and forth to work today, I checked the codes again when I got home. It added 0307 for cylinder #7. So it's not just the one cylinder....

Thanks. Unfortunately at a "few dollars off", out the door, they charged me about $468 to change 8 plugs....what a crime.

Greetings everyone. New to the group. I'm looking for some assistance in troubleshooting. I have a 2012 XLT EL, 5.4 3V, with about 101k miles. It's been running like a top up until about a month ago. It started running rough and eventually began misfiring. I used to have a 2002 F150, so in my experience it was a bad ignition coil. I got the code read to find out which one and it returned 0430 steering me toward possibly O2 sensors or Cat. As I was contemplating what to do I went and go the oil changed and had them read the code again. This time it returned additional codes of 0300 and 0307: Random misfire and #7. That helped me narrow it down (I thought) and would fix the 0430 code possibly too. Because of the mileage, I was just going to do all the plugs and ignition coils myself. I spoke with 5 different people/mechanics and they all gave me the horror story of 2 piece plugs and to not change them myself. So I took it to the stealership and let them rake me over the coals to swap out all the plugs. Of course they always come back with more, but I wasn't prepared to sacrifice my first born for new ignition coils at this time so just paid for the plugs. They said Bank 2 cylinders were showing between 1-3% compression change. I went to Autozone, got a whole set of Duralast coils and changed them in 20 minutes. The truck ran fine for about 2 miles and began missing again. "Son of a .....". So I got the codes read again. This time 0430, 0300, and 0306....#6....WTF? So I though, maybe I got a defective coil in the set of 8. I went back to Autozone and used the warranty to swap it out. Ran "ok" on the way home. Next morning, missing again on the way to work. Ugh.... Soooo...I've had new plugs replaced by the stealership and all new ignition coils and still misfiring. I'm stumped. Could this possibly be an electrical issue with the wiring and signal??? Please help. Thank you much.