First step I think is to read the fuel pressure when cranking from cold. If the build up is really slow and the car only starts when a certain pressure is reached, next step is a leak back test on all injectors.
Search You Tube for diesel leak off test.
Another check is when it started do you get a cloud of smoke from the exhaust - if so it's more likely glowplugs (diesel being injected but not igniting and building up).
Richard
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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