Hello,
I just had my 1991 Ford Ranger XLT pickup taken to a Smog Check 2 station, and here are the results:
%CO2 %O2 HC (PPM) %CO NO (PPM) Test RPM MEAS MEAS MAX AVE MEAS MAX AVE MEAS MAX AVE MEAS
15mph 1944 15.3 0.2 123 34 122 0.75 0.11 0.20 1020 260 758 25mph 1917 15.4 0.1 104 23 55 0.95 0.10 0.09 880 217 437Ok, now why are the readings at 15mph so much higher than the reading at
25mph? Also, the RPM at 15mph is higher than at 25mph. DMV made me take it to a test only station using a high emitter profile. How can I reduce these readings? Everything passed, but I cannot help but wonder what it is going to be like a couple of years from now.