yes fuel injecter blockage is prob the most common focus tdci engine fault i got mine on a 57 when car was 7 mounths old dune 12500 miles had it 3 weeks and had a blowen engine because of blocked injecters under fueled the ehgine witch melted the pistons so ford replaced engine under warrenty or id be looking at around 5, 500 for new engine plus ford labour id get them looked at and flushed out soon as m8 or it could be costly