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My diesel won't start in the morning - what's wrong?

My Peugeot 407 2.0 HDi won't start in the mornings. If I roll it down a hill it will start and it starts any time when warm. Any ideas?

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Failed glowplugs. It's a compression ignition engine which is why rolling downhill starts it and it starts when warm. But needs the glowplugs to glow to start on a level surface from cold.
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Good, sharp steering and handling. Excellent 2.2 173PS diesel engine.

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