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Old 05-19-2020, 01:58 PM   #17 (permalink)
rmay635703
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Quote:
Originally Posted by RustyLugNut View Post
Look back at the graph that was posted at the start of the thread. Notice the line for HC. It is climbing quickly

In summary, NOx at ultra lean fuel mixtures is not the culprit. HC and CO are.
The cat should burn off the hc and co using the excess NOx
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