Hello can anyone tell me why my truck always pumps blue smoke from the pipes at idle? I have richened the IP a little and that helped but it still does it. I read that the engine pushing just a little blue would be caused by retarded timing. My truck runs very quite so I think it is retarded. If that could be a cause which way do I turn the pump to advance it? All the help I can get would be great. Thanks and I really dig your forum.