Hi,
I've got a Y reg (Apr 2000)Astra 1.7 DTI with the Isuzu 16 valve engine. The problem I encounter is that the engine from time to time will not run smoothly. The engine does not appear to have a flat spot as this fault seems to occur at any rev setting except idle. The fault seems to be more apparent in cold weather. I use shell diesel but have also used BP Ultimate and ussually use millers diesel plus. The fuel filter has been replaced and there has never been any water visible in the fuel filter housing when replacing the filter. The Car has done 125 000 miles the engine had a replacement Cylinder Head at 117 000 miles. There is no coolant loss and other than the Kangaroo juice the car runs well.
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