After taking mark advice to scope AMM and APP,upon doing a WOT test there was a loud ticking noise when i floored it and started seriously missing,pulled rocker cover off and found one injector stuck down,suggested to customer to remove all injectors and get them sent off and tested.
After weeks of thinking about it he got a set of second hand injectors and it was still the same,still not listening to me about sending old ones away he left the vehicle with us in our compound for another few weeks and came back again with ANOTHER set of used injectors and it ran the same.
After having a long chat with him he finally came round to agreeing with me to get the injectors tested properly.
Sent off injectors away to darwen and results came back as all nozzles were u/s(prob did not help farmer had been running vehicle on dirty ribena for the last 5 years!!!).
Reconditioned all 5 injectors,fitted,adjusted clearance and coded in and vehicle ran like new!!Classic case of customer trying to keep the job cheap but costing loads more.
Thanks for all advice.
cheers Lee