Focus LZ 2016 - 1.5L Ecoboost - P2196 and Capless Fuel Filler Noise

[csfulton]

Some updates since.

While leaving the car to idle for awhile, the car showed gave a DTC for P0172. There wasn't any MIL.

Long Fuel Trim was at -25% and Short was -28%.

I checked out the EVAP Purge Valve, disconnecting it didn't change anything (other than a DTC for it being disconnected). Plugging it back in, it seems to have started working again. The short trim changed to 0%. But as soon as I accelerated to ~2500 RPM it went back to -25%.

After a 30 minute drive stopped at a set of lights the start stop attempted to turn off the engine, but again is sat at 550 RPM. When I noticed this, I pushed the clutch in and it started. I pulled over and let the car stop the engine again. It dropped to 550 RPM, but this time I left it. After 5-10 seconds the engine turned off and the "Manual Restart Required" message appeared. When I started the car, the MIL appeared, and it was for P2196. Checking the reading while the car was running at 550 RPM the short trim was at +50%.

Confident that something is wrong with the Evap Purge Valve, I order the part from Ford.

After replacing the purge value, starting the car it showed a -20% Long Fuel Trim and +20% Short Fuel Trim. Leaving the car idling and once it was to temperature, the values both started updating and both were corrected back to zero.

The car seems to be driving better. Also the Fuel usage while idling also seems correct. We shall see, but no DTCs after each drive for now. The noise from the fuel cap has also stopped.