Hi all, my first post here. Have a '06 4.2 TD intercooled with 175000 km. Starts fine when cold or luke warm, once up to operating temp., often starts only after about 30 secs. or varying degrees in betwen. Has power to glow plugs, fuel filter primer is full. Will fire immediately if turned off and back on, but not after any significant period. Has heaps of grunt, so not a compression issue. Not overfuelling as no chaff out the back on acceleration. Emits white fumes ( unburnt fuel) on startup after long cranking episodes. Once it fires, settles down immediately. Any ideas??