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Old 03-26-2001, 06:13 PM
Bruce Hasbrouck
Posts: n/a
NOx emissions

NJ is an emissions state, my 500sel failed NOx at 1550, did plugs wires, rotor, cap, air filter and brought it down to 1100, but not good enough, what next?
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Old 03-27-2001, 09:34 PM
Registered User
Join Date: Jul 2000
Posts: 638
High NOx

cool off your engine!! probably have plugged or inoperable EGR valve. Also be sure engine spark timing is correct and the vacuum advance/retard is working correctly. If the CO level is OK, not likely the cat muffler is bad, but possible.
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Old 03-28-2001, 08:48 AM
Bruce Hasbrouck
Posts: n/a
I suspected EGR valve, but went to the parts page and could not find one, how do I locate my EGR. THanks, could it be o2 sensor
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