Car is a 1L Seat Arosa, 2003. 66k miles.. This knocking noise was a slight problem before, but after a service I told that it was OK. Have just done about 800 miles in a week as was away in England, and first day back and the car sounds like a diesel in idle. When I push the clutch pedal in, it sounds normal, and runs good. Does anyone have any idea whats wrong??