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Car Forum / Honda Cars / November 2004High NOx and CO reading
I just failed my emission test with high NOx and CO readings on a 1994 Accord. Does anyone have any advice as to what could be causing this high readings. Thanks Alex That is an odd combo. Timing and mixture factors usually raise one while lowering the other. My suspicion is that the catalytic converter is kaput - assuming it is a 3 stage cat. It is a common cause of high NOx and can certainly produce high CO by virtue of not breaking each of those down. I mention about the 3-stage cat because the third stage - when used - is to break down NOx. Basically, NOx comes from advanced ignition or lean mixture, while CO comes from rich mixture. Mike >I just failed my emission test with high NOx and CO readings on a 1994 >Accord. Does anyone have any advice as to what could be causing this high >readings. > > Thanks > Alex > That is an odd combo. Timing and mixture factors usually raise one while > lowering the other. [quoted text clipped - 15 lines] > > Thanks > > Alex egr ports are plugged, have to slide hammer out the plugs, clean the ports and replug. the egr system is in place to reduce nox, which is caused by pressure and high temps. Chip >> That is an odd combo. Timing and mixture factors usually raise one while >> lowering the other. [quoted text clipped - 26 lines] > pressure and high temps. > Chip Although that doesn't explain the CO. Still, EGR is cheaper than a cat! Mike > I just failed my emission test with high NOx and readings on a 1994 > Accord. Does anyone have any advice as to what could be causing this high > readings. Thanks Alex CO is high, could be an inoperative O2 sensor. NOx is high, could be an inoperative EGR valve, carbon deposits, over advanced timing, cooling system too hot, lean mixture, cat-converter, or any mixture of the above. An inoperative O2 sensor could have worn out the cat- converter. |
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