[klassiek911]

I'm new here but not first to ask about tailpipe smoke (my 2.4S is suffering from it ). I've read some old threads to try to understand how to read the problem. They talk about how smoke in deceleration vs idling vs pulling away scenarios mean different things, but I am piecing bits together and not getting full picture. Could someone clarify what driving tests I can do to understand better what the likely problem is with my car and whether I am looking at top-end or full rebuild? What exactly is meant by smoke at deceleration? And does this indicate valve guide rather than piston ring wear?