My 2011 f150 has an Obvious misfire with no mil code so I have been diving into my live data at idle and noticed me EVAP pressure would fluctuate between +40PA and drop as far down as about-160PA ( with small revs to 2000-2500rpm ) it seems pretty extreme to me but I have not had much time working on coyote engines. Just kept trading them in after warranty lapsed but I purchased a 2011 for work and have no warranty so now I have stuff to figure out I guess. Any help or advice would be immensely appreciated.

 

As you will recall, the PCM will record history codes and just about any good scan tool will be able to show them and save you some time and trouble.

That CE light comes on when the pollution gets over the Fed limit..
Places like Autozone will scan your vehicle for no charge.
What engine in your vehicle ?
If you can post the codes here, we should be able to suggest where to start checking.

 

I have the a 2011 f150 5.0L with 145,368km and I have thrown injector cleaner and new spark plugs at it to try and smooth out the idle. I have been using an Innova 3100 J+ scan tool and a ELM327 BT dongle with the CarScanner app on iOS.

 

Is your scan tool capable of providing data stream info ?
If so, fuel trims, RPM, eng temp,oxygen sensor readings and MAF info ,are some of the things we need to look at.
If no misfire codes may not be misfire problem.

 

yes it is. My short term fuel trims are around 14-16% at around 650rpm at full operating temp. Have to look at maf and Oxygen sensors tonight after I google the required values.