Had focus serviced yesterday, mileage is 41k but engine has only actually done 20k as was replaced under warranty in 2010.

Had it serviced yesterday by my usual guy (not fords) and have noticed that engine sounds a lot louder during accelarating and at higher revs. cudnt get much above 50-60 today during busy traffic but have noticed it has a dull throaty sound when accelerating in 3rd gear between 2500-3000rpm.

Going to take it back today so he can check but my first thought was air filter?

ive noticed this can happen on some cars after an oil change im not sure why it happens but after a bit the car goes back to normal so ive always assumed it was down to new oil

Turned out to be air filter not sitting in housing correctly

lol oh well an easy fix mind you its easuy done with the cramped conditions at that side of the foci