Ok heres my problem...I'm a hot rodder, so anything with a computer is alien to me...I just bought my truck about 4 months ago and since I've bought it its lost so much power i can hardly drive it. Its a 2004 F150 4.6 4x4. When I'm on flat land its fine, as soon as I start uphill it loses power and starts going in and out of passing gear. Its showing codes P0451, P0453, and P0454 on a obd2 and when its underpower it sounds like an air nozzle. It's missing 3 of the cats and on the dash it says "check fuelcap". I cant find out what these codes mean and how to fix them. I would GREATLY appreciate any info....shoot I'll even pay somebody for their time! lol

 

Maybe a vacuum leak if it sounds like an air nozzle? Trace vaccum lines. SOmeone else maybe able to tell you the codes off hand, if not I can look them up.

 

P0451 Evaporative Emission Control System Pressure Sensor Range/Performance
PO453 evaporative emission pressure sensor High input
p0454 Evap Emission control sensor Erratic

 

Thanks I really appreciate that. I love my truck I just want it to love me lol

 

huh? you should have 4 from the factory

on your gas cap lid, check the gasket is nice & not damaged. replace if necessary.

also make sure to get at least 3 clicks when you screw the lid on. the fuel system gets pressurized and the PCM checks to ensure the integrity. if something is off there, then you get a check engine light