Hi I have a tapping/ knocking sound, it sounds like when injection trimming Is out to my knowledge, of corse it's commonrail so timing is not the fault seems to be when accelerating it kicks in and its worse when cold.
It's done 100k fsh I did hope it would cure with a service, I change all filters and oil still the same!
Checked injector coded correctly done self learn ect no change
Changed air mass no joy
Many ideas some as follows
Some my ideas as trained mechanic some from reading here!
From the bellow or indeed if you can think if something else I would like to know if some one else has had same symptom on same engine?
Where do I start ?
My thoughts:
Air leak fuel housing
Air leak intercooler or pipes
Wiring knock sensor harness
Timing chain or tensioner
Rocker/cam followers worn
Thankyou