hi there i have a 07 mondeo tdci 90bhp with 105000 motorway miles on as it has been a reps car and it has a loud pinking noise on tick over and on low revs i took it to my various garages one says it is the injectors another says egr valve and where i bought it says they are all like that which they would as it is under warranty and dont want to spend money but i have listend to other ones which are noisy but not as bad as mine can any body please help as it is getting worse.