hi mate,i worked at renault for about 8yrs until recently...... make sure you have a good supply voltage to the glow plug when the ignition is initally turned on.....if you have lots of smoke that means the fuel is getting through but not being fully ignited... definately seems like a few glow plugs may have bit the dust!!!....they can be a bit of a nightmare to remove on these engines,i suggest you run the engine and get the head warm first
paul
April 2009