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Failed emission, high NOx, else normal 200 1987

posted by  bazdar on  Fri Mar 7 15:36 CST 2003
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My car, 1987 Volvo 240 DL just failed Texas emission test due to high NOx and I am hoping that some of the guys here would make an educated guess as to what may be wrong and how to fix it, before I do some expensive replacement, such as catalytic converter, as recommneded by a guy who did testing.

This car drives and starts just fine, I owned it for five years. Here are the actual readings from the test:

____________STANDARD_____CURRENT READINGS
HC(ppm)_____157__________67_____________(high speed - 25mph)___PASS
CO(%)_______1.00_________0.27___________(high speed - 25mph)___PASS
CO2(%)______N/A__________14.7___________(high speed - 25mph)___PASS
O2(%)_______N/A__________0.1____________(high speed - 25mph)___PASS
NOx(ppm)____1121_________2289___________(high speed - 25mph)___FAIL

HC(ppm)_____162__________93_____________(low speed - 15mph)____PASS
CO(%)_______0.91_________0.29___________(low speed - 15mph)____PASS
CO2(%)______N/A__________14.6___________(low speed - 15mph)____PASS
O2(%)_______N/A__________0.2____________(low speed - 15mph)____PASS
NOx(ppm)____1121_________2144___________(low speed - 15mph)____FAIL


THANK YOU for reading.






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