X5 Lack of Power / Black Smoke

[edonald]

G’Day,

I've only just joined this forum but I've gained much useful information over time from it by browsing the threads.

I've driven a 3.0 X5 2003 diesel automatic for 5 years without any major issues but I've been having a problem over the past couple of months which I'm hoping you kind people could provide me with advice that may help sort my problem.

Sorry for the long explanation but here goes.........

Around 2 months ago I experienced reduced power when accelerating - it sticks at around 1500 rpm when pulling away at which point I get a ploom of black smoke from the exhaust before the power eventually kicks in. If I put my foot down I also get a large ploom of black smoke from the exhaust.

I initially took the car to the BMW dealer who put it on the diagnostic machine and recommended a new fuel filter, new EGR valve and new glow plugs.

This did not resolve the situation so I took it back to the BMW dealer who recommended a new mass air flow (MAF) sensor.

This improved the lack of power / black smoke for a couple of weeks but I'm now back to square one. I get the feeling the dealer is just experimenting at my expense without really knowing what the problem / solution is.

I've also taken it to an independant who says there are no leaks or loose connections to the turbo.

Can you people please offer me any advice as to what my problem is?

Any advice is greatly appreciated.

Thanks in advance.
ED.