Mike, I have 1 correction and 1 addition to the previous post. The Pontiac 6000 started out at .62% CO and was reduced to 0.0% I also did a 93 Dodge Intrepid 3.5L about 6 weeks ago. The beginning emissions were: 60ppm HC, .04% CO, 13.4% CO2 & 1.2% O2 @idle ... Login to read more.