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hi all could do with some advise the i have the x5 e53 30d it has been a night mare the last 12 months i keep getting bad black smoke so far i have had the turbo done oil seperator done egr checked air flow checked fuel pressure monitor changed now i have been told 2/4/6 injectors are either under or over 6 dont know what this means i have also been asked if the injectors are selonoid or electronic sorry for the question might seem stupid to some but i have know idea what to do with it the car has done 118000 miles and is an 03 plate
any info would be very much appeciated
 
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