Bmw e70 x5 5 out of 6 glow plug fault codes logged

SOURCE: TDI Hard Start

This could be an Injector But, Not likely. Try this First, It is a long shot But, It is Cheaper. Replace your Gas cap. You could be Sucking air into the Tank from a Bad Gasket on the Gas Cap Causing your Hard Start.

SOURCE: BMW E60 530d WILL NOT START WHEN IT IS WARM

pcv valve maybe the issue. does it misfire?

SOURCE: I have a mitsubishi shogun sport 2.5td 05

i had the same problem with mine , change the fuel filter , i found black sludge in the filter . works fine now .

SOURCE: my 318i bmw 4 cylinder has hard start on cold morn...

possible air mass meter fault or split concertina air hose between airr flow meter and manifold

SOURCE: 2001 land rover Disco II td5 not starting - no fault

Check the crank and cam position sensors...sometimes they don't kick the SES light on until they fail. one of the main symptoms of the cam position sensor failing is the "no start, but cranks fine" issue. This happens especially when the engine has been driven and is warm. If the sensor has failed, the engine won't start at all, and everything else will seem fine..the part is usually cheap at the store, and usually easy to replace since it will be near the top of the engine somewhere. I'd start with that and see how it goes...The other sensor I mentioned is also critical in the timing of the engine the "crank sensor" if it fails, it may also cause that situation. The two sensors together tell the CPU where the cam and crank are in their timing sequences. If one isn't working, the CPU won't know where to fire what cylinder, so it just won't fire any of them. ie: No Start. I would replace them both just to be sure. Since you have checked everything else, and it cranks, I can't think of anything else at this point. Good luck. :)