Jourdan

Won’t start - new battery last week

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Got the battery replaced last week as wouldn’t start and needed jumped a few times. Cold frosty morning and again won’t start. Please help ?

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Could well be heater plugs/ relay as modern high pressure diesels rely on plugs far more than their older counterparts. You really need to first of all check that you're getting 12v (slightly over 12v actually) on the heater plug wire when the plug symbol appears on the dash. If that's OK, it's a matter of testing individual heaters although you'd be more likely to have  lumpy start if just one plug was down so I'd suspect fuse/relay / bad connection so long as it starts OK when not cold.

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Modern DI diesels don't need plugs to start until well below 0c, they're mainly used for emissions reduction and a smother idle now.  It's the old IDI's that needed plugs to start even in fairly mild temps.  The light also has no relation to the plugs, they stay on long after the light has gone out.

 

What is happening when it won't start...does it turn over at all?  Does it start immediately with a jump?  Was a cheap (wrong) battery fitted?

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I was led to believe that modern glow plugs heat up very quickly and so they're not as overt in their operation hence why people think they're not needed. With the bit where they stay on much after the light is out, is the plugs going onto a low-power setting which is as you say for emissions and smooth running.

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