2005/05, DW8B/WJY series engine - IDI like the old XUD but with some electronic management of injector pump.
Owned from new and now on 140k miles. Always started at first turn of key and immediately idled smoothly.
Three weeks ago it went to my normally reliable and trustworthy Cit specialist for major service. Cambelt was replaced as well as fuel and air filters.
Since it came back it’s been ‘odd’ starting. From cold it’s decidedly rough, misfiring for 5-15 seconds accompanied by grey smoke and smell of incompletely burned diesel. Slightly hesitant even when warm. Once running though it’s fine and pulling like a train as usual. Trips to Liverpool and Leicester return normal fuel consumption and other performance.
If it had displayed the symptom spontaneously I’d have said glow plug(s) not right or, if not, air in fuel. Plugs were tested and pronounced OK for circuit, resistance and timing. Observation on start up showed small air bubbles passing down line filter to pump in second after start but not necessarily coincident with roughness.
It’s been back to garage three times and after a ‘no fault found’ diagnosis *2 it was kept overnight with fuel filter fitted at service being adjudged faulty and replaced.
On cold start this morning it was still as rough as a Badger’s backside for 10 secs with grey smoke etc.
Ideas for cause and where do I go next please.
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