Hi all
Can anyone tell me how to adjust the idle speed on my Grand Voyager 2.8 crd , 2005 model

The dealer claims its difficult to do, I thought that they would plug in the drb111 and adjust it electically

Idle seems a bit slow 840 rpm causing slight vibration which dissapears as revs increase
i was told it should be 900 rpm
The dealer claims he wants 2 hours to sort it out ?

Dont seem right

Thanks Al