when my wife's miata flunked its smog test due to
just-over-the-limit no reading (san fran tests -- all urban tests -- are
tougher than rural tests due to all the bloody vehicles therein) the
only fix was to get a new catalytic converter. which did the job.
nitrous oxide is the stuff they're trying to get rid of. art '82 westy

Joel VanderKwaak wrote:

> Hey all,
>
> I just had my semiannual CA smog check, and noticed that the NO is up
> from last time, and is above average for the vehicle type (vanagon,
> obviously :) ). I'm way below average on the other readings (O2  =
> .1/.4, HC = 14/13, CO = 0.04/0.05, NO = 351/466 - the */* indicates
> readings at 15 and 25 mph).
>
> Any thoughts on what may cause the higher NO? Time for a tuneup maybe?
>
> Thanks,
>
> Joel
>