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Changed Oil Now Rough Idle & Hesitation
Good Afternoon everyone! I have an early 04 6.0 Excursion in which I just changed the Oil and Filter on yesterday. I now have a small lope in the idle only when it reaches operating temp (normal when cold). I also have some hesitation/miss/buck/sputter between 1300rpm to 1900rpm when in a higher gear or overdrive.
I also replaced both fuel filters at the time of the oil change.
I put in 14 qts of Valvoline Blue and the reading on the dipstick is halfway.
The EGR was cleaned less than 1000 miles ago and no signs of water.
The coolant level is consistant.
No DTCs or dash lights.
It will start fine, hot or cold, sitting for an hour or a week. NO need for the block heater.
It will puff a small amount of black smoke under heavy heavy acceleration (which I think is normal).
The truck is bone stock (was a Mommy Mobile) with 92,400 miles on it.
The previous owner had it only serviced by Ford.