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CAN SOMEBODY HELP, I HAVE A 52 PLATE SCENIC 1.9DCI DIESEL I HAVE HAD THE LOW PRESSURE FUEL PUMP CHANGED ALSO THE FUEL FILTER, HAD THE CAR PLUGED INTO A LAP TOP FOR DIGNOSTIC TEST BUT NOTHING SHOWED UP BUT THE ENGINE STILL IS HUNTING :confused:
 

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I had a Megane dCi do this the other day,an airflow meter (aka MAF sensor) cured the fault.The revs fluctuacted between 700 and 1200rpm,there was a puff of black smoke everytime the revs dropped too.Try disconnecting the MAF sensor and seeing what effect it has.

The fuel pressure regulators can also cause uneven idling,what was the rail pressure showing on the diagnostic data?.
 

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THANKS LAGDTI FOR REPLYING I HAVE HAD THE AIR FLOW METER CHANGED,A FEW MONTHS AGO BUT IT WAS STILL HUNTING AS FOR THE PRESSURE ON THE RAIL I AM NOT SURE, IT WILL HAVE TO BE PLUGGED IN AGAIN :confused:
 
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