The problem with the car is at first it was tapping/knocking, then smoking white smoke. Today i sprayed a tin of egr cleaner into it and the smoking stopped but the knocking remains.
I have tried a new cam sensor, another map sensor, checked the belt timing, checked the valve shim clearance, one of which is a bit tight but there is clearance. and had the injectors out to view the spray pattern which was ok but not perfect, they do atomise.
The odd thing is i place my hand over the air inlet on the manifold to restrict the airflow and the knocking goes away.
Any hints appreciated.