could be a leaky injector seal, which would manifest it self in 2 ways, first when the car is parked up for more than a few hours it allows air into the fuel system, so every time you start its as if you are starting a car that has run out of diesel, it will start quite quickly because you have to only push the air in the system a short distance before it is cleared and secondly the faulty washer will allow diesel to leak into the sump, unfortunately the leak, if thats what it is, isnt severe enough to notice a rise in the oil level overnight and will need to be watched for weeks.
a bad earth would trigger a fault code in the ecu so it is unlikely to be that but not impossible
if no other faults are stored in the ecu memory i would have all the injector seals/washers changed, the parts will cost less than £20 and about 2 hours work to do
regards peter
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