Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - High Nox emissions after rebuild
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Old 04-02-2012, 04:34 PM   #3
SPI Tuner
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NOX is because you car is getting to hot. The EGR system puts burned gases back in to the cylinder to reduce NOX emissions. So yes you are right. Since I'm guessing you live in Cali the emissions standards take that into consideration. So yeah check you EGR flow with a vacuum pump on the EGR test port. If you surpass 4.2 in/hg of vacuum and the engine doesn't start to idle rough then that is your problem.
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