I would at least check it. They tend to dry out from engine heat, harden, and shrink - which allows a vacuum leak (and doesn’t fully allow the PCV valve to work properly).
One other thing to check - is there a code set for slow engine warmup? If so, that means the engine coolant thermostat is...
You may have a clogged PCV valve. Replace it. Ensure the rubber PCV grommet is not hardened, shrunk and leaking.
A vacuum leak should not cause the milky oil - which is a sign of condensation not boiling-off.
When activating either seat switch, do you hear any noise from the seat motor?
If so, look under the seat from the front and rear using a strong flashlight, to see if anything is jammed in either seat track (such as a coin or pebble).
Also look for anything that may be under the seat and...
I know a different generation - but on my 2015 Expedition Limited, the tail lamp bulb SOCKETS were serviced separately and sold individually (no wiring harness or lamp assembly).
You may want to check with a dealer and see if the socket is serviced separately. You could get a new one, then...
Is there a code being set since you changed the plugs and coil (and used the injector cleaner)?
You may want to next carefully inspect all vacuum hoses for a leak, paying attention to the ends where they plug into connectors - where they are more susceptible to splitting and leaking.
If that...
Year, make, model & engine?
Since you replaced all spark plug with OEM Motorcraft ones, I would use one or two tankful of Techron fuel injector cleaner according to the label directions.
Suggestion: Research the vehicle lemon law for your state. You have been without your new vehicle for more than a month and your authorized Ford dealer is unable or unwilling to fix it.
If your vehicle qualifies - proceed with a lemon law vehicle repurchase (or new vehicle if allowed in your...
You did not mention the year of your vehicle.
If it were me - driving that distance pulling a trailer with my family, I would have the transmission fluid changed and the following.
Are the spark plugs original? If so, I would change them or have them changed. The Ecoboost engines are hard on...
I sold my 2015 Expedition in December 2024 and bought a new Chevrolet Tahoe Premier in part due to the poor service of Cronin Ford in Harrison Ohio.
I did not consider buying a new Expedition due to poor dealer service, lack of parts from Ford and the numerous defects on my Expedition - which...
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