When i start the car on a morning the glow plug light comes on, but doesn't seem to go off.I crank the engine and it does start after a few attempts, but i get a lot of white smoke from the exhaust.Starting during the day isn't a problem and i don't have the white smoke any more.Is this because i need to change the glow plugs?? or is it something else.http://www.citroen-owners-club.co.uk/citroen/public/style_emoticons/default/blink.gif