Hey Scotty, I have a 2009 Ford F-150 FX4 with a 5.4L engine. Automatic 134,000 miles on it. I'm getting codes P0175 & P0172 also telling me that my 02 sensors are stuck rich. So before I got these codes I was running lean. So I changed out my spark plugs and my injectors. Now I'm getting those codes and I'm running rich. When I go to start my truck it hard starts. I was getting 50psi on the rail with the key turned. When I go to start it it drops to about 3-4 psi until it starts up it hits 50psi again. I've relplaced my 02 sensors a couple of months back when I was running lean and that fixed my issue. Then it started running lean again so that's when I changed out my injectors and spark plugs. I've changed out my fuel pump driver module, made sure o rings on my injectors aren't leaking. I'm not really sure where to go from here. My hoses look good and not cracked. So I don't think I have a vacuum leak unless it's my EGR or Purge valve. My Mass airflow sensor appears to be working properly. I don't have loss of power when driving it seems normal, it just starts rough and I'm running rich. Any help would be appreciated. Thank you!
Well you did change your injectors if one of those seals isn't ceiling right and a leak raw fuel into the engine and run rich or you could have gotten bad injectors realize that. Now you can also run rich because the mass air flow sensor doesn't work right the fuel pressure regulator isn't working right the wiring isn't working right lots of things but since you change those injectors I would check that first
