Loss in mpg after service - any ideas?
Discussion
We had my wife's 1 litre Ecoboost Fiesta serviced last week (25k miles, 15 months old). The service consisted of an Oil, Oil Filter and Pollen Filter change.
However, since the service I have noticed that the mpg has dropped and there is a slight hesitation during gentle acceleration when cold. For the last 25k miles I have reset the mpg counter each week and it has never dropped below 50, usually it's in the range 51-55.
Since the service we've done 2 resets, the first time it was in the 49's and now it's in the 47/48's. Nothing has changed, her commute is exactly the same and she is driving in the same way she always has done.
It also has nothing to do with the cold weather as the car was getting easily 51+ throughout all of last winter.
Ford are taking it back tomorrow to re-check everything, but anybody have any ideas what could be causing the slight hesitation and drop in mpg? The worry I have is that it's such a small change in behaviour that it will make the problem hard to diagnose.
However, since the service I have noticed that the mpg has dropped and there is a slight hesitation during gentle acceleration when cold. For the last 25k miles I have reset the mpg counter each week and it has never dropped below 50, usually it's in the range 51-55.
Since the service we've done 2 resets, the first time it was in the 49's and now it's in the 47/48's. Nothing has changed, her commute is exactly the same and she is driving in the same way she always has done.
It also has nothing to do with the cold weather as the car was getting easily 51+ throughout all of last winter.
Ford are taking it back tomorrow to re-check everything, but anybody have any ideas what could be causing the slight hesitation and drop in mpg? The worry I have is that it's such a small change in behaviour that it will make the problem hard to diagnose.
Jimmyarm said:
Did they do a software update to it ?
Not that I'm aware of, but I'll double check with them tomorrow.The tyre pressures have definitely remained constant as I check them regularly and have done so since the service. The petrol mix is an interesting point but I doubt it as we've filled up twice in that time and it's never happened in the last 15 months, we always fill up at the same place.
One possible theory I have is that they used the wrong oil, the Ecoboost needs 5W20 which isn't a mainstream grade so maybe they put in the wrong oil by mistake? You'd certainly hope not being a Ford dealer but stranger things have happened.
I'll update after the dealer has had a chance to diagnose it.
Sorry for the late update.
Ford checked the car over and reported no hesitation on a test drive and an under the bonnet check revealed nothing out of place.
However, literally immediately after picking the car up the hesitation from cold has gone completely.
My personal view is that they've fixed something and not told us. It is too much of a coincidence that the hesitation was there, and then like magic it's fixed after a morning at the dealers.
With regards to the mpg my wife's commute has now changed so it's hard to say if there's been any change on that front.
Ford checked the car over and reported no hesitation on a test drive and an under the bonnet check revealed nothing out of place.
However, literally immediately after picking the car up the hesitation from cold has gone completely.
My personal view is that they've fixed something and not told us. It is too much of a coincidence that the hesitation was there, and then like magic it's fixed after a morning at the dealers.
With regards to the mpg my wife's commute has now changed so it's hard to say if there's been any change on that front.
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