just some added info..
A common fault I get in my workshop with the JK CRD are faulty fuel pressure regulator, faulty fuel pressure sensor. But the symptoms are cutting out while driving along (faulty regulator), engine light coming on with the "ping" (faulty sensor), I generally change both out as a pair. But these faults are a common rail diesel thing and are related to long change intervals of the fuel filter, hence why I do fuel filter changes every 10,000kms.
If your symptoms are:
*long cranking when cold.
*Starting seems to improve as it warms up.
*Everything else has been checked, fuel,
It's likely to be a poor or loose earth, follow the earth battery lead and remove, clean, tighten, see what it does.
Regards
Daz
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