i know this is a really noob question but how do i tell if my car is running rich? i'm changing spark plugs to NGK iridium but from what i've read it's no point if my car's running rich as it would still burn out or not be as effective anyway?
i'm guessing there will be white smoke from my exhaust? black smoke? i've got a apexi vafc which came with the car when i bought it. does that have anything to do with it? thats an air fuel ratio controller rite?
also, i'm guessing that it is NOT a good thing if my car is running rich? will the apexi vafc i have be able to rectify some of these problems?
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