Been reliably informed today that my 2001 disco td5 vibration issue is down to a slight imbalance on injector 4...but I'm happy as it seems dual mass flywheel isn't fooked after all. I was thinking to plump for new injector there and then but then thought would that be hasty? Could it be a dodgy harness even tho no oil at ecu plug? Would a simple dose of good quality fuel treatment help? Is adjustment likely to help? Anyone with similar experience? Thanks as always.