I recently purchased a 807 2.0hdi 136hp. On test drive it seemed to have good acceleration. It was given a basic service and cambelt change before i picked it up.

Now I have it, it seems to be very slow on acceleration. I timed a 0-60 time of over 22 seconds where figures i have seen for this model say it should be about 12 seconds.

The car was not loaded up with people while doing this and seems to be very good on diesel, averaging about 37 mpg. Is 22 seconds about right, as I know it's a heavy car, or could something have gone wrong whilst changing the cam belt?