Jdk0423
Junior Member
Bought a 2007 5.7 a few months ago. It’s throwing the codes p0457 p0455 p0456 p0440 and p0430. Truck had a straight pipe on it when I bought it. Is misfiring pretty bad, had a leak test done on it and they didn’t find anything. The canister looks like it might’ve been replaced before I bought the truck but honestly not sure. Other than that I’ve changed the purge valve. Not sure if putting an actual exhaust and converter would make a difference? Don’t know a whole lot about these trucks yet and don’t wanna dump a bunch of money into it blindly. Thanks
