1991 Honda Accord EMISSIONS TEST

1991 HONDA ACCORD
175,000 MILES • 4 CYL • FWD • AUTOMATIC
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PERICLES1960
  • MEMBER
  • 1 POST
RECENTLY FAILED SMOG TEST (GROSS POLLUTER) DUE TO HIGH CO, ALL OTHER READINGS HC, NO2, WERE OK . I HAD TUNED UP THE ENGINE, SPARK PLUGS ,CAP/ROTER, CHANGED THE OIL. WHAT COULD PROBABLY CAUSE THIS ?
Mar 6, 2009 at 9:45 AM
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JAMES W.
  • ✓Experienced Mechanic
  • 2,394 POSTS
You may want to get your cat. converter checked. If this is bad it can create high CO.
Mar 6, 2009 at 2:02 PM
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