It seems that whenever the car has been left on an upward facing gradient, the engine is likely to react by displaying fuel starvation symptoms. i.e. being difficult to start in the same way as a petrol engine behaves when stricken by damp ignition problems. When it eventually does start, after straining the limits of the battery's capacity, there follows a large black exhaust cloud and then it runs perfectly thereafter. I do not have any experience of diesel malfunctions. Anyone ever heard of this one?