Hi Guys. In the last couple of months the beast has started mildly surging while driving at constant throttle (and cruise)- happens sporadically and at lower speeds (not motorway). When this happens there tends to be a light puff of black smoke visible in the rear view mirror when the surge reduces. Doesn't happen when stationary and the throttle blipped. Runs perfectly ok - injector pump original and done 250k miles.
Recent French motorways trip yielded just over 20mpg at 85mph with top box so doesn't seem like continual over-fuelling?
My thoughts on cause are either an ECU/sensor problem or just plain worn diesel pump?
Any thoughts on most likely cause?
TIA as always.
Brian
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Recent French motorways trip yielded just over 20mpg at 85mph with top box so doesn't seem like continual over-fuelling?
My thoughts on cause are either an ECU/sensor problem or just plain worn diesel pump?
Any thoughts on most likely cause?
TIA as always.
Brian
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