any idea which fuel line was replaced .. ?
( high pressure system or low pressure system .. i.e. pre or post high pressure pump )
be a fair few things that will cause the td4 to lack oomph .. ..
i.e. apart from fuel supply issues ..
a bit of grit/dirt in the wrong place could cause mucho damage to the h.p. system ..
( although there is a micro filter on the h.p. pumps regulator )
and .. if for some reason the low pressure side can't supply the specified pressure on demand .. *the ecu will cut the engine power in order to prevent damage to the high pressure pump (e.g. low pressure pump failing .. blocked fuel filter )
as for air in the system .. not sure how that figures in the td4 ..
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* recently happened to mine .. power hit a brick wall @ 3500 rpm in 3rd gear ..
'n i only tried that 'cause i suspected something were not right ..
( in my 'normal' driving the engine won't much see revs over 3k .. if that )
as the fuel filter was 10k miles past replacement time .. n the l.p. fuel pump was getting noisy on v.cold mornings ..
( vehicle be on 75k miles now )
i figured both could do with replacement .. i.e. while the fuel filter Had to be replaced ..
engine revs potential now back to specs.
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some links for your bro. to read thru ..
might be a clue in them ..
( also note some of the sticky threads re lack of power in this forum )
td4 engine faults :
http://tuning-diesels.com/75Zt/R75faults.htm
about the 'maf' sensor :
http://tuning-diesels.com/75Zt/R75maf.htm
about the td4 engine ( bmw m47r ) :
http://www.rover-club.net/graphics/manuals/16/m47r_diesel.pdf
( does not include info. re. the variable vane type turbo )
regarding the Air Intake Temperature sensor :
http://www.landyzone.co.uk/lz/f9/black-smoke-224520.html
about common rail fuel systems ( as on the 'td4' m47r engine ) :
http://www.yildiz.edu.tr/~oisin/Dersler/Dersnotlari/0653611/dinjection.pdf
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btw: any smoke symptoms .. or other symptoms .. with your bros. td4 ?
