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t4 2.5tdi power drop out

  1. 2.5tdi major power drop out at high revs. Help!!!

    Engine & Gearbox
    My van is a 2.5tdi on a 53 plate. It has suddenly started dropping power attwo thousand to three thousand revs. It us getting worse and I now can't get above forty in fifth gear. Engine also sounds rough when I put the clutch in and rev it. It still starts first time and sounds fine on tickover...