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Forum > Failed Smog Test > Question

Can my 1991 Honda Civic Pass Smog Test?

HC(PPM) MAX GP MEAS / CO% MAX GP MEAS / 15MPH 91 305 154 .57 2.3 .97 25MPH 73 255 146 .48 2.2 .88 NO(PPM) MAX GP MEAS 15MPH 835 2054 2544 25MPH 774 1854 2460 I failed smog inspection with my 1991 Honda Civic. It burns a quart of oil every 500 miles. Do you think I can pass replacing the CAT? What else should I do or is it impossible when it burns oil like it does. What can I try?
Answer:

Replacing the CAT is not a guarantee your Honda Civic will pass the smog check. With the excessive leakage of oil into the combustion chambers we have to expect your Honda has built up significant carbon build-up. We recommend a compression test to start. If high, you'll need to conduct a carbon cleaning. You may then retest your Honda Civic and if emissions are still high begin by diagnosing the high CO fault. you'll need to ensure your vehicle is in proper fuel control. Visit our Failed Emissions Test webpage for more information about high HC, CO, and NOx. posted by SmogTips Support

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