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If you do a search on this site you will find detailed descriptions on the subject.
To increase the power on the diesel engines provided to Jaguar/Ford they changed from a vacuum actuator to a electronic unit matched to a garret turbo,these units are supplied as one piece as they have to be calibrated together failure to do so causes the turbo to run out of sync.Fords/Jaguar charge mega bucks for the replacement unit they are actually available at around £675+vat and take around 4hours to remove the old unit and replace the new one.The reason the actuator fails is through to much heat it bakes itself there are companies around that say they will supply just the actuator but you then need to calibrated it to your turbo.The Jaguar/Ford diesel engines when they have done a reasonable mileage need the EGR valve and inlet manifold removing and thouroughly cleaning failure to do this normally manifests itself as a poor running engine or a blown turbo.
Further details can also be found on the x type and Mondeo forums.
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