Question about 1994 Mitsubishi Galant
Took my mitsubishi through CT emissions 4 times and failed everytime on nox only, my numbers dropped a little everytime with repairs until i put the new egr valve on then my numbers shot up higher then they were in the first place and now i'm not sure what to do. new plugs new wires distributor and cap and router tryed the gas additives air filter evap canister cant afford a new cat so any help would be greatly appreciated.
Test One HC 103 CO 0.37 NOx 1891
basic tune up plugs wires air filter distributer cap, router then took
Test Two HC 91 CO 0.40 NOx 1876
tried the gas additives heet fuel injector cleaning etc.. then took
Test Three HC 96 CO 0.43 NOx 1761
replaced egr valve then took
Test Four HC 97 CO 0.42 NOx 1965
You need to check the oxygen sensor. You car may be running lean and therefore giving you increased NOx levels
Posted on May 30, 2009
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Posted on Jan 02, 2017
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Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.
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