Failed Emission Test Massachusetts

[95atxsho]

*Revised* -Failed Emission Test Massachusetts

1994 SHO ATX 148K, Tuned it up Saturday (Plugs and wires, fuel and air filter, oil in plug wells, not much though compared to 2-95's I had), runs great, I don't know what i'm reading but here goes:

HC=Pass
CO= 00.5.44 Reading Limit 020.00
NOx=02.94 Reading Limit 02.50
CO2=295.18 grams per mile
It says your vehicle has failed the cruise portion of the test.

As usual Thanks for all your help.
Paul

 

[AALERTCS]

Did they have it hooked to that dyno???

 

[AutoSHO]

High NOx translates to a lean condition, which is typically caused by bad oxygen sensors.

 

[HopefulSHO]

High NOx translates to a lean condition, which is typically caused by bad oxygen sensors.

What he said. Also might be about time to clean out the EGR passages..The sole purpose of your EGR valve is to lessen NOx emissions.

Was the car good and hot when they tested it? Converter's gotta be real hot to do their job right.

 

[95atxsho]

Yeah but, the O2 sensor would throw a CE light or blink under accelaration, the car runs great. It was hooked up to the dyno. EGR might be a good call. I'll look in there over the weekend.
Thanks Guys and happy motoring.
Paul

 

[AutoSHO]

The Oxygen sensors will not always throw a code as they get old and lazy. They only throw a code when they get very bad.