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Excerpt:Dyno
Testing: What is an Enhanced Smog Check or ASM test anyway?
"Remember how NOx emissions are created
when the combustion temperature gets above 2500¾F? Well, if
we do a smog inspection at idle speeds, there isn’t enough
heat to create much NOx. Even at 2500 rpm, there isn’t enough
load on the engine to create enough heat to make high
NOx emissions. So our regular ..."
