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post #21 of (permalink) Old 5th April 2006
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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....
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