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Not to sound contradictory, but I'd be more inclined (with what you have said) to think that its more likely to be fuelling. If the battery was weak, then it would be the case that more cranking/attempts would lessen the odds of ignition. It may be fuel line with a partial airlock weakening the mixture (have you recently run low/out of petrol?). Alternatively, the fuel filter or injectors may be blocked. First (cheapest) port of call is to fuel car to maximum with a good quality fuel, add any of a variety of additives for cleaning injectors then once the engine is warm take it up through the gears, using high revs, then give it a good run on a motorway/dual carriageway. See how you get on with that. If that doesnt cure it, replace the fuel filter.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater