Right..i been out ragging the car yesterday ...Took spark plugs out today.....

3 were lovely grey/brown perfect

No 2 (on plug lead) was looking more whitish now i did notice that the gap was a tiny bit bigger than the rest.

So:-

Can gap if open slightly more cause a colour change?

Could that plug be failing at all?

Is that no 2 cylinder prone to run more lean than the rest?I did have a seal leak on that injector in the inlet manifold before...but i put a new seal and that seemed to cure it....(as it caused onboost misfire)..any other reasons????Fooked injector..any tests i can do?