Originally Posted by canis
It's done it through more than one tank of gas (different brands) and a bottle of Lucas injector cleaner. No real noticeable symptoms. Just a slight, erratic tick in the idle, but I may be dreaming things. Overall the car drives fairly normal. The most consistent thing about when the light comes on is when its below 50*. The spark plugs I pulled out (in the pic) only have about 7k on them. I just replaced them last spring.
Just check if the single spark plug is consistently getting extra soot or if it's a temporary problem. It may be temporary due to Murphy's law, but it may also indicate that there is a small oil leak or a faulty injector in that cylinder.
Just a curious question? Why so many different threads on the same subject?