I have a Fiesta RST - when I started it this morning there was a loud knocking when I started the car - like something banging off the inside of the rocker cover - was like metal on metal. It didnt clear unitl the car was revved.

The car was in at AVA yesterday and got Rolling roaded etc. Was 120bhp at the wheels after chipping.

Im wondering if this has anything to do with the cars lack of use before I bought it. It was slow revving and needing some TLC when i bought it a few months back. Its only done 40k.

Anyway the car sat in the driveway for 3 hours so I nipped out and started it again - and it happened again - any suggestions?