1988 Chevy Nova NEED GUIDANCE ON WHAT TO DO LOWER CO EMISSI

1988 CHEVROLET NOVA
120,000 MILES • 4 CYL • 2WD • AUTOMATIC
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MPEETZ
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HI, THANK YOU FOR YOUR RESPONCE! MY '88 NOVA FAILED EMISSIONS CO TEST. STANDARD TO PASS IS 15.0. AND THIS CAR IS AT 120 TO 140! I'M FAMILIAR WITH CAT. CONVERTERS, OXYGEN SENSORS BUT HOW DO YOU CHECK TO SEE IF IT'S ONE OR THE OTHER? AND IF NOT, WHAT DO YOU THINK WOULD BE THE BEST PATH TO CLEANER EMISSIONS? THANK YOU FOR YOUR TIME AND GUIDANCE! I APPRECIATE IT!
Dec 26, 2008 at 4:54 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Carbon monoxide failures indicate an overly rich fuel mixture. On older carbureted engines without electronic feedback controls, look for things like a stuck choke, misadjusted or fuel saturated float or a rich idle mixture adjustment. On newer vehicles with electronic carburetors or fuel injection, the system may not be going into closed loop because of a bad coolant or oxygen sensor.
Dec 26, 2008 at 5:00 PM
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