Hi all, my diesel last week was making a noise like a ticking rattle, I had white smoke also, I did the Carly scan and found two injectors to be at fault, ive replaced the injectors and all the seals and o rings on the other two however, the car runs well, no smoke but the noise is still there, I've ran another scan which tells me all 4 glow plugs and glow plung control are faulty as well as EGR fault. I don't think any of the faults mentioned is the reason for the noise, does anyone have any ideas? If it's a timing chain noise is that because the chain needs replacing? I thought they lasted for ever?