Smog question--87 Dak

From : jack

Q: can anyone tell from the following numbers if i am running too lean or too rich or just right this dak has air injection to the cat. thanks jack ---15 mph--- %co-------9.4 %o2-------7.0 hc ppm---34 %co2------0.0 no ppm--315 ---25mph--- %co-------9.6 %o2-------6.8 hc ppm---29 %co2------0.0 no ppm--401 .

Replies:

From : neil nelson

jack zzz@xxx.net wrote can anyone tell from the following numbers if i am running too lean or too rich or just right this dak has air injection to the cat. thanks jack ---15 mph--- %co-------9.4 %o2-------7.0 hc ppm---34 %co2------0.0 no ppm--315 ---25mph--- %co-------9.6 %o2-------6.8 hc ppm---29 %co2------0.0 no ppm--401 air fuel ratio can not be accurately calculated if the gas samples are diluted with o2 from an air pump which yours obviously is but the co readings in the 9%+ range suggest that that thing is running pig rich. .