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Old 11-19-2004, 11:07 PM
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pesuazo pesuazo is offline
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Join Date: Oct 2002
Location: Near Raleigh, NC
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Other possibilities for High NOx:

Malfuctioning/Inoperative EGR valve, Out-of-calibration MAP sensor, plugged injector, low fuel pressure, vacuum leak, advanced ignition timing.

Any of those malfunctions will cause higher internal temperatures, hence increasing NOx.
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