1991 Nissan 240SX Help with smog results

1991 NISSAN 240SX
130,000 MILES • 4 CYL • 2WD • MANUAL
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SHASHANKP
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Need some advice with the smog result and probable fix to be done on the car.

15MPH 1755RPM 14.7 CO2% 0.3 O2% 81 HC(MAX 118 AVG 31) 0.61 CO%(MAX 0.75 AVG 0.10) 79 NO(MAX 799 AVG 237)

25MPH 2784RPM 15.0 CO2% 0.1 O2% 24 HC(MAX 93 AVG 20) 0.20 CO%(MAX 0.63 AVG 0.09) 74 NO(MAX 738 AVG 199)

Though I did pass the "Enhanced California smog" test it can be seen that the HC and CO are inching towards the ceiling in low RPM case.
Apr 24, 2009 at 9:42 PM
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RASMATAZ
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  • 75,992 POSTS
If both HC and CO are high, the vehicle may have a bad catalytic converter or an air pump problem
Apr 24, 2009 at 10:01 PM