HEAVY BREATHING!

[SKIDEMON]

Hi. my 2.0L diesel puffs out black smoke on heavy acceleration. The rear is covered in soot. Also (maybe related?) it jerks when cruising along at a steady speed... Help!!

[Greydog]

Morning Wayne

Welcome to the Forum

1 When was it serviced last ? (not just an oil change)

2 How many miles on the clock ?

Black smoke is over fuelling or unburnt fuel, you say the back of your car is covered in soot which would indicate there has been an issue for some time. The jerking could be related or it could be Tyres that are causing it. Your X3 is AWD if front and rear tyres are not matched then damage can be caused to the AWD system. Have you had tyres changed recently?

If you are not able or capable of doing the work your self you need a Good Garage or preferably a BMW Specialist to help diagnose and fix it.

Dave