Hey guys I just want to start off by saying thank you to everyone on this forum who helped me! I'm a diesel tech on OTR trucks but my knowledge on gas engines is not very good so I'll give everyone the store and the solution. Here we go

So the truck is a 2009 F350 with the 5.4. It was towed to my house and I found low compression, no big deal, we'll just drop another engine in it. So I order the longblock and pull the old engine out(PITA!!), swap everything over and in goes the new one. I start it up and it's running horribly, great. It idles fine but as soon as you hit the throttle it goes to heck in a hand basket. And at 2000 Rpms I had a bad vibration. Hook up my scanner and I'm getting a P2196 For B1S1 biased/stuck rich. So I begin to look for the issue why it's running rich and only on 1 side. And the exhaust smelled awful. Checked my fuel pressure to start with just to verify its good, and it was. I began unplugging injectors and I noticed the engine was running no different. I thought an injector was open and it was dumping fuel. So I pulled the injectors up out of the hole and turned the key over to pressurize them to check for leaks, not a single drop. Turned the engine over to check for spray and they're spraying fine. Disconnected the coils and nothing changed so I pulled the plugs and they looked fine as well. I then pulled the intake back off thinking I may of had a vacuum leak on the intake somewhere, nothing again. I verified I plugged my o2 sensors in and they were, hmmm. Getting frustrated I then decided to swap my o2 sensors around to see if it followed over to bank 2 and it didn't, desperate at this point I swapped the injectors to opposite sides to no avail. I go to my scanner and pull up some parameters and my fuel trim on bank 1 is extremely negative still and nothing was adding up. I continued troubleshooting over the next 3 days and didn't get a single clue as to what was my issue, that was, until this afternoon. I got a wild hair idea that maybe the converter was cracked/stopped up and exhaust gasses had nowhere to go so my solution, remove the upstream o2 sensor to try to give the gases somewhere to go, I got under there and burned myself on the exhaust a handful of times, got the sensor out and started the truck up and she purred like a kitten. The vibration I had at 2000 Rpms was gone, and everything was fine. So if your having this issue the this could be your issue. Going to put a new cat on and see what happens. Here is a pic of what your reading might look like! Thanks again!

 

Some times diagnosing why your getting the code and condition that is causing it means going thru the laundry list of things and possibilities and eliminating them one by one. A lot of of folks have a love hate relationships with catalytic converters because they can do some funky things when it comes to making a truck run ****ty.

Glad to see you found the issue, I think once you make the change you should be abck on the road with no issues. Appreciate you sharing the solution

 

no problem!! Really like this forum! I might just hang out and lurk in the shadows around here lol