Assuning its turning over fast enough... I would say a coulpe glow plugs have gone bad. You just need a multi meter to test them, just test for resistance. If they are open they are burnt out. Also note I have had one that wasn't open but the resistance was super high, making the other glow plugs not glow at full temp because it was sucking all the power fromt the circuit. Watch out for readings that differ greatly from all the others. Even in warm weather, if the engine is cold it still needs a short glow period to start easily.
Jason
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