Car runs flawlessly with 140k on it. Here are the emission numbers from last year (1869RPM) and this year at RPM settings of 1898 and 1399.
25/25 test
3/2005 3/2006 3/2006(1399RPM) Allowed
HC ppm 101 111 128 103
CO% .27 .30 .27 .57
NO2 ppm 298 703 868 712
RPM 1869 1898 1399 2500
CO+CO2% 14.7 14.4 14.6 6.0 min
50/15 test
3/2005 3/2006 3/2006(1399RPM) Allowed
HC ppm 81 119 131 107
CO% .27 .31 .28 .59
NO2 ppm 233 661 868 786
RPM 1918 1965 1432 2500
CO+CO2% 14.7 14.4 14.6 6.0 min
After failure we replaced spark plugs, wires and got fault codes for mass air flow sensor. We replaced the MAF, got no more fault codes, retested, and got virtually the same test numbers as before the repairs. The catalytic converters are original. I run 10w30 full synthetic oil and again the car runs fantastic. Where do I go next? My next thought was the catalytic converters. I wouldn't think it would be an 02 sensor. If it is the Cats are any of the aftermarket Cats any good? Thanks. Mike D.
