Hello, I drive a 2020 F-150 with a 2.7l engine. It has both port and direct injection and if I understand correctly it starts and initially runs on the direct injections primarily/only during the first several minutes of driving. I make several 15 minute trips a week and I notice that for the first 5 minutes or so the 5-minute-mileage history and instantaneous mileage shows a very low number, maybe 12 mpg and then hops up to the mid-20s for the rest of the drive. My trip (tank) mileage will drop .1 mpg for the first several minutes then come back to where it was for the rest of the drive. Driving conditions are the same throughout the drive, only the engine/transmission temp is obviously colder initially, currently about 50F. Additionally, the engine seems to have a slightly uneven idle when I start it, perhaps like a slight misfire, occasionally. One little "putt" every few sections in an otherwise smooth sound.
I am wondering if the things I notice are related and if there is anything that can/should be done. My mileage would be quite a bit better, I think, if 1/3 of the time I was driving I wasn't getting less than 15 mpg, when all the driving is the same. Could my engine be running too rich for some reason? Interested in insights-
Thanks
I am wondering if the things I notice are related and if there is anything that can/should be done. My mileage would be quite a bit better, I think, if 1/3 of the time I was driving I wasn't getting less than 15 mpg, when all the driving is the same. Could my engine be running too rich for some reason? Interested in insights-
Thanks