Tdci 1.4 2010 - Intermittent start up issue

[shezlatic]

Good morning,

Sorry if this question has already been posted, I've trawled the internet with no luck looking for an answer.

My 2010 Fiesta 1.4 TDCi occasionally struggles on start up. Once or twice a week.

The car starts up quite lumpy and jittery, almost like its struggling for fuel. I need to wait a few seconds before the revs pick up. It also omits greyish/white smoke. I noticed yesterday that the oil light came on for a couple of seconds when i was waiting for the revs to pick up.

Once driving the car runs fine.
The garage have been unable to diagnose any problem and my fuel economy seams to be fine.

There is no smell of diesel inside or out of the car when in use.

Does anyone have any ideas? Is this something I should worry about?

Many thanks in advance