Over-fuelling problems?

[Wooly Bugger]

Hi All
New to this forum. It looks great!
I need some advice please:

2007 model, 26 000 km's, moderate riding
lots of black smoke at cold start
engine hunts at idling speed
slight ping at 130kph
throttle response checked and reads equal
BMW diagnostics reckon the mixture is LEAN?
RHS spark plug pitch black
HIGH fuel consumption.......

off to the workshop!


10 days later the scenario as follows
swopped out all the vitals and re-mapped fuel settings (solved the start-up problems)
checked lambda sensors and swopped them over: no difference
replaced injectors: no difference
checked FPR: works spot-on
no damage to RHS piston/rings/valves

still smokes at 5000-7000rpm

what could it be? is the engine perhaps sucking in air through a leak some where? AFR settings as per BMW standards.

Quo Vadis?

Thank you

Wooly Bugger from sunny RSA

 

[Zigo]

To me it seems you still have a problem with too rich mixture of air/fuel. Sucking false air will usually lean out the fuel mix. Did you check your air filter? It might be clogged. There is also a air temperature sensor located on top of the air filter box.

 

[Pukmeister]

My guess is air charge temperature sensor on the airbox giving a false reading leading to an excess of fuel.

Are you sure you have a spark on both plugs and its not just poor combustion due to this ?

 

[Kremmen]

I take it that the air filters been checked???? .... or that some grubby "youth" hasn't inserted a bit of rag into the air intake pipe.

Not that i ever did this you understand.....