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Old 12 Aug 2013, 03:16 am
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Default 1992 honda accord high nox?

Ive been working on my car, changed cat, o2 sensor, erg valve, cleaned egr intake and much more i took it to smog and it failed due to high nox. What could be causing high nox?
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Old 12 Aug 2013, 03:32 am
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There is a solenoid that opens the EGR valve do you know if that is sending the correct signal? Seems like you got most of the things that should cause it.
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Old 12 Aug 2013, 03:48 am
AJ AJ is offline
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It could be the cat. Some cats aren't smog legal you know.
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Old 12 Aug 2013, 04:03 am
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You haven't mentioned checking the ignition timing. It only take a degree or two of excessive advance to make it fail NOx.

Beyond that, we need all the readings to get an idea what is going on. If the CO is low when the NOx is high the mixture is too lean and the excess oxygen is preventing the NOx from being reduced. Ambient air is 19% oxygen, and even 2% free oxygen in the intake of the converter will stop it from reducing NOx.

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