I own a 2009 mini cooper S (R56). Done 55,000 miles. Since I have owned it for last 8000 miles I have mainly used it for commuting to work which is a lot of traffic, stop start etc. Previous owner used it for around town too I think.
I am having problems with the EML coming on (majority of the time). Rough start, especially in the cold. Hesitation and poor acceleration. It is just about driveable once warmed up, but not pleasant to. Popping noises from exhaust whilst warming up.
Probably is using more oil than usual.
Error codes came up initially with misfires cylinder 2 and 4. Superknocking.
A garage diagnosed it with needing to replace the HPFP - which I have had done, but no difference made.
Also had full service inc oil change, spark plugs/coils changed.
Now it is showing the error code 'fuel quantity control valve, activation'. And the EML comes on still.
I am wondering if this could be carbon build up causing these problems?
Reading through other posts the symptoms seem to fit. Wondering if walnut shell blasting could help me.
Very grateful for any advice.