FWIW A knowledgeable person in my office has told me that if you run your engine down to a gallon of gas or so, and add 3 cans of "Heat" (alcohol) you can pass emissions tests. (YMMV!) And dont forget to fill up afterwards. Maybe it's a symptom of other problems though? HTH Cheers' Bill m 95 1/2 Avant flyer 75 Carrera