1988 Nissan Sentra can't pass emissions

1988 NISSAN SENTRA
200,000 MILES • 4 CYL • FWD • AUTOMATIC
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1988 Nissan Sentra , mileage: 200,000. I can’t pass emissions. Limits are HC 220, CO 1.20. I read HC 318, CO 5.63. Airflow meter & ISC read ok. Timing is ok. Valve job two yrs ago (broken belt). O sensor 1 yr ago. Car runs ok. HELP!
Nov 9, 2010 at 3:36 AM
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The reasons for the high emission are numerous. The list starts with a malfunctioning catalytic converter, a faulty engine management computer system to a "tired" engine with excessive blow by and using oil.
Nov 9, 2010 at 3:38 AM
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