Vantuner no longer tunes them, as they are not reliable & any tuning will add more risk to already over sensitive injection system.
One issue , on this Delphi injection system setup, is tolerance of rail pressure deviation, anything over approx 60bar from spec at full pelt (1600 bar) & you have limp mode. A standard van is kissing this limit anyway so even tuning which avoids any rail pressure increase directly will lower this margin..So they can run good apart from going into limp mode under full load intermittently.. What a load of bollocks.. The creators should be ashamed of themselves – In ancient Greece, the word Delphi may mean “Womb”.. Clearly Fords 1st common rail offspring has a birth defect.
Problem solving in cases like this van’s relies on a tuner having access to something called a description file, an “A2L ” a ” Damos ” , These illegally gained manufacturer’s files identify maps & functions & would in this case allow the rail pressure deviation tolerance data to be increased, but no such files exist ( outside of Ford HQ) for Fords of this vintage so no go sadly.