F150Torqued

Yes that long term fuel trim is too high. (Not surprising you have lean DTCs, they are triggeredd when LTFT is > 25% and STFT is > 10%.)

You are correct - ONE most common cause of lean DTCs would be vacuum leak. HOWEVER - the PCM is way to fast for you to detect a change in idle rpm or characteristics when you spray test for vacuum leaks. To test for vacuum leaks, use Torque Pro to help and you can find them almost instantly.

Set up a dashboard similar to this: (showing O2 sensor volts on a graph, and STFT on a '+' and '-' gauge. Observe that while you are spraying around. When you hit even the smallest source of vacuum leak - both STFT and O2 sensor readings will GO CRAZY. You can eliminate areas (like PCV system by removing the bank 2 PVC line at manifold and _PLUGGING_ it up at the mainfold. Evap system or 4X4 vacuum line by 'clamping' the lines _SHUT_ with vice grips) momentarily while monitoring the Torque gauges.




When testing or vacuum leaks - I prefer to use an 'UNLIT' propane torch. Torque react to the propane almost better than carb cleaner, starting fluid or other flammable and is not as hard on rubber components or paint.

Humantorch

I actually already checked the pcv valve with a trick I saw on youtube. Unscrew it and stick your finger on it. If you feel a good suction then it's good, which it was so I feel that's eliminated.

I've also watched many videos on testing vacuum leaks and with carb cleaner the idle changes are audible and vey much detectable on vehicles with no problems at all other than a lean code.

My truck vibrates quite a bit and under acceleration the vibration and hesitation are extremely violent. I can't imagine it's a microscopic vacuum leak causing these kinds of problems.

My fuel pressure stays at a nice steady 40 at idle, when accelerating and when idling down so at this point I have to assume it's an injector.

Kinda sad that for the price of a set of injectors I can buy a whole new motor.

Got any tricks up your sleeve for diagnosing injector flow without pulling them one by one?

F150Torqued

Humm. Did they happen to mention 'closed loop'? Or Idle Speed Control Mode (PID # 097B)? or Idle Air Control Duty Cycle (PID # 1153)? or anything like that? Did they happen to identify where the PCV valve is located or why feeling vacuum there is conclusive against a vacuum leak in the crankcase ventilation system?

That all worked pretty good before ole 'OB conobe' showed up on the scene.

Injector 'flow' is pretty difficult, next to impossible, to test. Leaky ones are about all that can be determined with any success (lift ALL still connected to fuel rail - put news paper under al them and turn key for short period. Somewhere above 100k to 200k miles, I think they all should be replaced preventatively.

Humantorch

I wasn't looking for a vacuum leak when I took the pcv out, "faulty pcv" just came up when googling "rough idle lean bank 1&2" and the reverse dutch boy maneuver was just something that seemed worth a try.

Injectors at $50 a pop, It'd be cheaper to just get a used engine dropped in at a junkyard... so definitely not going that route.

The vehicle isn't safe to drive so I doubt I'll ever be able to get mode 6 tests to complete before the problem is fixed. The only tests that did complete successfully were for the egr sensors and they all checked out... so I got that going for me.

I took a snapshot of my torque homescreen after coming back from getting gas and airing the tires up. I don't know if this helps but for your viewing pleasure: