Chipped the van 2 weeks ago but initially the engine died after 2 minutes driving. I put this down to poor positive earth battery connection. It's been ok for a week and a half except it died again this morning. I've detached the wiring and the injector wiring is back to normal. Disappointing journey back as there is a noticeable loss of power after getting used to the chipped modification. I am going to ring their Techy line tomorrow and ask for a replacement unit. The only thing that might have caused a problem is that the computer box is taped to the body of the vehicle battery - it was the only place that it could go. I am wondering whether there is an electrical field in this area that could be affecting the unit.
SH