General overfueling 2.0jtd

[chopper2010]

took back van to garage from where i bought it 3 days ago due to misfire/rough running,it was put on a diagnostic machine and i am told nothing wrong is showing up , also there are no lights coming on at the dashboard ie engine management light etc, but the van has now started to knock each time i climb a hill and the revs climb to maximum and it belches out clouds of black smoke as if overfueling, when i turn it off and start it back up again its ok apart from the original lack of power and misfire, driving it back to the garage was ok as long as i kept the revs very low and in a high gear so it just limps along is this due to a sensor or possibly ecu problem. thanks.

 

[DucatoMiltonKeynes]

Take one of their mechanics with you on a test drive and show him. Tell the manager that if it isn't fixed right away that you want a full refund as the van isn't fit for purpose.