My 2003 A3 2.0 TDi Sport, will not start...The glow plug light comes on and stays on - as long as this light is on, the engine spins over OK but will not fire up.
If I keep turning the ignition on and off for about 20 minutes, litterally, and if I am lucky, the engine management light flashes up quickly...then the car will start. But only then.
Once started, the engine is a bit lumpy...missing slightly.
On hard acceleration it smokes a great deal..grey smoke.

This has occured suddenly this week and has been perfect up to now.