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need help high nox emissions 200 1990

posted by  Josh Bolivar on  Tue Jan 19 02:30 CST 2010
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last visit: Tue Jul 26 17:19 CST 2011
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Hello, I need help. My 1990 volvo 240 will not pass Texas emissions. I have read and been working the FAQ.
Car has 124,000 miles. I have replaced two vacuum lines, new air filter and correct plugs. Got a fault code of 212 so I replaced the O2 sensor with a new bosch O2 sensor. Last year I replaced the cat converter to pass the test.

Most recent test was last week.
Readings RPM 7098 result 8801 result
HC(ppm) std 162 134 pass std 167 123 pass
CO% std 1.04 0.76 pass std 0.94 0.86 pass
CO2(%) 14.1 14.1
O2 (%) 0.6 0.6
Nox(ppm) std 1163 2405 fail std 1273 2392 fail
dilution std >6.0 14.86 pass std >6.0 14.96 pass






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