Hdi 110 dsport engine running on for a few secs

[Hairychin]

Hi there I've got a ds3 hdi 110 , I've had her about 6 wks , there isn't any problems with starting and runs and idles perfectly smooth , mpg round the doors is about 47/50mpg and motorways is approx 70 mpg , but I've noticed every time I switch the ignition of the engine runs on for 2 to 3 seconds , does anyone else's diesel do this is it normal , my journeys are usually quite short don't know if this is a factor , Iam going to give it a good blast at the weekend to see if it still happens ,,it's my first diesel so not sure if they all run on for a couple of secs?? Ps, cars only done 9000 mls

[Saabob]

this could happen if you one or more of your injectors is faulty / dirty.....instead of a nice dust spray of diesel when the car is on idle maybe one is leaking a little so you get a drip of fuel instead of spray , this could be due to bad fuel or dirt that has made it past the filter .....try some injector cleaning fluid that you had to the fuel I have seen this befor at work on and audi and the injector cleaner helped it after a few kilometers it blends with the fuel and starts to work so it could take a short while befor the car behaves normally again .