Hi all,
My friends 300tdi discovery auto has recently become very erratic when idling and the revs hunt up and down when driving making it difficult to maintain a steady speed, it occurred soon after I replaced the starter motor for him (not sure if just a coincidence), but wondering if the rectifier has gone in the alternator causing fluctuating voltage effecting the governor on the EDC pump?

Will test the diode continuity soon but has anyone had a similar issue caused by an alternator fault? My auto is a mechanical pump so I'm not really familiar with his EDC system.

Thanks

Sorry, posted in wrong category, can't work out how to delete.