Join Date: Dec 2005
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If one of your spark plugs was a different colour/sooty then you probably have a misfire on that cylinder.Just out of interest,have you had the dreaded compression check?.You wouldn't notice a slight drop in compression on one cylinder when you were driving it,only at idle.A 'sensor' wouldn't cause one plug to 'soot' up.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo