[QUOTE=opienor;812122]Hi guys!

.................. the DDE light indicates glowing. QUOTE]

Whats the outside temperature when this happens?Does the glow plugs light stay on while you are cranking ?
Do you have any error codes?
From a mechanical side,they shoud be looking at glow plugs first,injectors and then they should check the fuel pump pressure.

From an electrical side,they should check the crank sensor,fuel rail pressure sensor .