I need help with my mondy diesel. It has had a rattle/ gruff sound on tick over for about 18 mths now and its starting to really pi$$ me off! It is so loud you cant talk near the car! My brother in-law is a mechanic for nissan and does all my work on all my cars but he cant work this out. I have had 2 tensioner pulleys, 1 new and 1 second hand and no good. Thinking of booking it in to a diesel specialist to look at injectors. Any one have any other ideas please