Suburban Catalytic Converter
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Can old gas be the cause of a failed smog test?
1989 GMC Suburban. Fuel Injected, has an EGR system, oxygen sensors, and a two way catalytic converter. It failed the NO portion of the test with about 400 ppm over the limit on both 15 and 25. I am well aware of the EGR's role in NO emissions. I know exactly what to check for, so don't tell me about it. What I really want to know is could 3-4 year old gas be the cause of my high NO emissions? I obviously haven't driven the truck in that long.
could be. old gas would,nt burn as clean as good gas.
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